Post #1903: Hallelujah! Return to normalcy.

 

Background

Two nights ago my wife and I attended the 52nd annual Messiah sing-along at Clarendon United Methodist Church.  Because we do this every year, and I write it up, I can directly compare last year’s sing-along to this year’s.

For those of you unfamiliar with this tradition, Messiah is a baroque oratorio about the birth and death of Christ.  The words are straight out of the King James Bible (ca. 1611).  The music is straight out of the early 18th century (ca. 1741).  Despite these handicaps, the Christmas portion of it is still widely performed at this time of year (ca. 2023).  To reach for the LCD here, it’s where the Hallelujah Chorus comes from.

This is now one of my acid tests of how well we, as a society, have gotten past COVID.  That’s because a) sing-alongs are an extremely high-risk event for spread of airborne disease, and b) the typical in-person participant for this event, in the past, tended to be elderly. Continue reading Post #1903: Hallelujah! Return to normalcy.

Post #1902: A few lessons from thrift shopping for a Christmas tree

 

This continues the prior post, in which I attempt to transition my family from real Christmas trees to an artificial tree.

In this post, my wife and I hit the local thrift shops to see what artificial Xmas trees were on offer there.  This is a good way to see a wide variety of artificial evergreens, side-by-side, in person.  We didn’t buy one, which is no surprise.  But we learned a lot.

(Unfortunately, I did not think to take pictures, so all the pictures here are fakes — AI-generated from Gencraft.com.)

Takeaways:

1:  There is a thriving secondary market for artificial Christmas trees.  In one shop, they went so far as to apologize for the limited selection.  They’d mostly sold out prior to Thanksgiving, but that they’d be getting fresh stock in over the next month as people in the area “traded up” to a new tree and gave them the old one.

This is helpful not just for buying a used tree, but also for getting rid of one in case I buy something that I end up disliking.  Before this, I figured that donating a used fake Christmas tree was like donating trash.  But now that I know that thrift shops actively deal in used artificial trees, I have a way to dispose of any potential bad purchase.

2:  There are some butt-ugly artificial Christmas trees out there.  Even acknowledging all the limits of thrift shopping, we came across several trees where my only reactions were a) I can’t believe somebody sold that as a Christmas tree, and b) I can’t believe somebody bought that as a Christmas tree.

3:  The fine detail of the needles matters a lot.  Some artificial pine wreaths, in particular, were indistinguishable from real, to me at least.  Others just screamed fake.  The most obvious difference was specular reflections (shiny spots) on the needles.  Broad, flat, shiny needles look like nothing in nature.  They look like plastic, full stop.  Narrow needles with a dull surface appeared real.  In addition, for reasons that escape me, some artificial pine needles were made in shades of green that just aren’t found in nature.  (Or, as my wife puts it, they are found in nature, but only on dying trees.)

In any case, with a bunch of different wreaths in a pile, or an array of trees in one corner, some simply jumped out as being fake.  Others did a much better job of mimicking real evergreens.   And that all boiled down to fairly subtle variations in color, reflectiveness, and shape of the needles.

4:  Fake tree technology has evolved over time, for the better.  Thrift shops let you see older and modern versions of the same goods, in one place.  Old tech trees had removable individual branches that fit into a central trunk, and tended to look only vaguely like a real tree.   All the modern trees had branches that are permanently affixed to the central trunk with steel pivots, and in general looked far more realistic.

After seeing a few, it was clear that I didn’t want an old-tech tree with removable branches.  Modern trees appear to be significantly better.

4A: I think I finally understand the fashion for having artificial trees that look purposefully artificial.  White, say, or metallic-looking.   Back in the day, if your options were to have an artificial tree that tried but failed to look real, or to have a purposefully artificial-looking tree, artificial-looking was plausibly the more stylish option.

4B:  On a tech side note, the old technology of removable branches meant you could, in theory, put the tree back in its original box.  We saw two like that — re-stuffed into the original box — both old-tech trees with removable branches. I’m guessing that’s not typically possible with a modern tree, with permanently attached branches.  So modern trees require something to store them in, other than the original box.

4C:  Old tech trees with removable branches seem to preclude the possibility of a pre-lit tree (that is, one with built-in lights).  So the “pre-lit tree” goes hand-in-hand with the change in the basic technology of how these artificial trees are put together.   It’s really only possible once you go to the permanently-attached branches approach found in modern trees.

5:  Most of the trees in the thrift shops were pre-lit trees.  (That is, trees with the Christmas lights attached.)  I’m not sure whether that’s because a) those trees are better sellers originally, or b) those trees break more quickly, or c) people who want the convenience of a pre-lit tree are more likely to “trade up” more frequently.

5B:  For sure, the preponderance of pre-lit trees in the thrift shops screws up my ability to find a bargain there.  Pre-lit trees have substantially higher original prices compared to plain, un-lit trees.  Accordingly, they sell for substantially higher prices in the thrift shops.  But since I don’t want a pre-lit tree, all this meant to me is that the typical discount-from-what-I’d-otherwise-purchase-on-Amazon was small.  Trees that, for me, appeared functionally equivalent to a an unlit $100-$120 tree new, from Amazon, were on offer for $60 to $70, because they were pre-lit trees.


Conclusion:  Buying a tree from Amazon now looks riskier.

Going into this, I figured I could quantify what I wanted in a fake Christmas tree.  Height, density of “branch tips”, and so on.

What I learned is that the hard-to-quantify aspects of an artificial evergreen have a big impact on how good it looks.  Little details like color, surface finish, and shape of the needles have a big impact on how realistic the tree appears.  Some trees and wreaths were instantly and obviously recognizable as artificial.  From a good distance.  Others were, to my eye, at a reasonable distance, indistinguishable from real evergreens.  And it wasn’t necessarily the build quality or the density of the materials.  It was that some of the needles just plain looked like plastic.

That’s a problem, because I don’t think there’s any way to quantify that on Amazon.  Sure, I can specify a minimum density of branch tips per cubic foot, and so on.  But that’s not going to guarantee a realistic-looking tree.  Instead, how good the tree will look will depend in large part on those little details of the needles.  That’s going to be very hard to judge from a few photos on Amazon, or even from purchasers’ comments.

Now add to the mix all the ugly trees we saw today.  Plausibly, once upon a time, each of those was the apple of some purchaser’s eye.  At least until they opened the box.

You’d think that would argue for buying locally, but my local selection of un-lit, green, artificial Christmas trees is extremely limited.  My local Home Depot has, I think, one that fits that description.  My local Ace Hardware has none.  I didn’t see anything meeting that description at my local Target.  And so on.  I’m guessing Amazon and other on-line retail has pretty much chased the low end of the market — where un-lit plain-green trees would be found — out of bricks-and-mortar retail.

It’s not clear what my next rational step would be.  Probably, I’m going to gamble on something that’s highly-rated on Amazon, sight-unseen.  And if that turns out to be a dog, then off it goes to the thrift shop, post-Christmas, to make way for another try next year.

Post #1901: Artificial Xmas Tree

 

Three key things I didn’t know about artificial Xmas trees:  Fluffing time, branch tip count, and storage.

I knew nothing about artificial Christmas trees.  So I started my research where I usually do, on Amazon.

When I started, I assumed you pulled the tree out of the box much like a magician pulling a rabbit out of a hat.  Reach in, give a tug, and out comes the tree, fully-formed.  The branches must “sproing” into place, or something.  And at the end of the season, you stuffed it back into the same box, the branches neatly folded back into rest position, and you were done.

Five minutes on Amazon, and I realized I had no clue how modern artificial Christmas trees actually worked.  The twin keys to my ignorance were frequent mentions of “fluffing time” and “branch tip count” on Amazon.  Use of these terms made choosing a tree kind of difficult, as I had no clue what either one of them was about.

Fluffing time:  The big branches of the tree do fold up and down against at the trunk, but all of the little branches are just stiff wire, with plastic “pine needles” embedded.  Turns out, all those little branches are packed flat against the main branch.  You have to bend each individual branchlet into place, by hand, one at a time, in a process termed “fluffing” the tree.

Branch tips:  And this is where the “branch tip” ratings come in.  A six-foot artificial tree might have anywhere from 1000 to 2500 “branch tips”.  Which more-or-less equates to that many little stiff pieces of wire that must be bent, by hand, into some approximation of a real tree.  More branch tips (per unit of tree volume) leads to a fuller-looking fake tree.  On Amazon, time and again, the manufacture would say something like “45 minute assembly time”, and the Amazon comments would say something along the line of two to three hours of “fluffing time”.

The upshot is that “fluffing” is the industry euphemism for spending hours of time bending little stiff wires covered in bristles, so that your myriad branch tips approximate the look of a real tree.  The near-universal advice on Amazon was to wear gloves and take your time.  In fact, many of the trees on Amazon come with a pair of gloves thrown in.  Presumably because you’ll need them.

And the third key thing?  Storage.   Because, although nobody say this explicitly, fluffing appears to be a one-way street.  I get the impression that nobody packs their tree down into anything like the original size.  As a result, you need somewhere to store your fully-fluffed tree — possibly in pieces, possibly slightly compressed — for the off season.

The upshot is that a new artificial tree requires several hours of “fluffing time”, wherein you take 1000’s of branch tips and bend them into shape.  After which you must store the tree in its fluffed condition.

 


Purpose and summary of this post

In our family, we’ve always gotten some type of real Christmas tree.

But this year I’m going artificial.  I think.

As usual, before I buy a consumer durable, I do my homework.  This post summarizes what I’ve learned so far.  Starting from a point of complete ignorance about artificial Christmas trees.

Briefly:

  • Artificial trees are overwhelmingly the U.S. norm, with roughly 85 percent of households with Christmas trees opting for an artificial tree.
  • Families with little kids tend to favor real trees, and tend to transition to fake trees as the kids age and the parents retire.
  • The main reason cited for buying an artificial tree is convenience, which I think dovetails with the use of artificial trees by age.
  • Artificial trees last about a decade, on average.  So the decision to go artificial kind of locks you into it for a while.
  • Environmental concerns for real-versus-fake trees are more-or-less a wash,
    • But the longer you keep the same fake tree, the better.
  • For a newly-purchased fake tree, “fluffing” the tree — bending thousands of wire branch tips into position — seems like a major pain.
  • Fluffing is a one-way street, so you need a place to store your fluffed tree in the off-season.
  • Trees with embedded lights don’t last as long as plain, unlit trees.
  • White trees tend to discolor over time, particularly if stored in non-climate-controlled areas.
  • The more “branch tips” per unit of tree volume, the fuller your tree should look.

The upshot is that I’m looking for a plain, un-lit, un-decorated green tree.  With a reasonable number of branch tips per unit of volume.  (Which, of course, I have worked out a formula for.)  And the first thing I’m going to do is scour the local thrift shops, because the thought of spending hours “fluffing” a tree is unappealing.

We’ll see where it goes from there.


Background:  Oceania had always been at war with Eastasia

My father, who shouldered most of the labor, once suggested buying an artificial tree. We called him out for the vulgar suggestion of convenience over tradition, and he never brought it up again.

Aryn Baker, in Time Magazine, December 2022.

I can relate to the quote above.  As the family member officially tasked with Getting The Tree, I’ve been lobbying for an artificial tree for years now.  The stopper has always been my family’s refusal to consider an artificial tree.

In particular, my wife was clearly and firmly against buying a fake tree.

Or so I thought.

Our Christmas tree traditions have been sledding downhill for decades.  Once upon a time, we’d make a big outing out of taking the kids to a cut-your-own-tree farm.  That lost its charm as the kids got bigger, so we went with the trees offered by a local charity.  We’d go to the lot, make a fuss over getting just the right tree, then overpay the local charity, all in the spirit of the season.  After a few years of that, we got to buying our tree so late that my only option was to shanghai whichever child was available for a last-minute run to pick up a tree at the local big box hardware store.

So we were already at the point of real-Christmas-tree-as-industrial-commodity.  Which it has been, all along, in reality.  But buying one in the garden section of Home Depot just hammered that home.

Deck the Halls and scan the barcode?  Not very Christmas-y.

But last year I hit rock bottom, with an exotic tree species, the brown pine.  On a whim, I picked up a little live tree, figuring to plant it after Christmas.  It had some species name on the label, but as it turns out, it was actually a member of the brown pine family.  This was only revealed a few months after putting it outside.

And so, in the spirit of the holidays, I once again asked my wife if she still objected to artificial Christmas trees.  And the answer was not merely that she had no strong objection, but that she’d never had any objection to artificial trees in the first place.

And just like that, I’m in the market for an artificial tree.


Environmental impact of artificial Xmas trees?

In a nutshell:  It’s no big deal either way.

First, If I’m an environmental sinner for buying a fake tree, I’ll surely have a lot of company in hell.  Households with real Christmas trees are a small minority.  In 2021, about three-quarters of American households displayed a Christmas tree, and of these, 84 percent have an artificial tree (reference).  That’s figure varies a bit from year to year, but is in the low 80 percents in all the surveys shown on the cite referenced above.

A different (yet seemingly credible) poll shows just 71% of surveyed adults (who were having a Christmas tree) planned on having an artificial tree (reference).  That’s a huge discrepancy (versus 84 percent, above), for a simple yes/no question.   The same article cites the association representing Christmas tree growers, which puts the number around 75 percent, but should be treated as a number from an advocacy organization.

So which estimate is more likely to be right, 71% artificial or 84% artificial?

Don’t be mislead by statistics about annual Christmas tree sales.  Based on the survey cited above, the median life of an artificial tree is about ten years.  Accordingly, each year’s sales of real trees top the sales of artificial trees.  But that’s only because the typical artificial tree user buys a new tree just once a decade.

That said, annual sales data, coupled with a typical 10-year lifetime, suggest the 84-percent-artificial estimate is correct.  In a typical year, about one-third of Christmas tree sales are artificial trees (reference).  With an average 10-year lifespan, in the steady state, that (via simple math) implies that about 83% of Christmas tree used in any given year are artificial trees.

The upshot is that real Christmas trees are not exactly a relic of the past, but they long-ago lost the bulk of the market to artificial trees.

Further, and without citation as to source, my decision to switch to an artificial tree late in life is typical, as is my reason for doing so.  As people age, and no longer have young children in the home, preferences shift toward an artificial tree.  And the most-cited reason for going with an artificial tree is convenience.  Both of which describe my situation.  And so, my family’s long downhill slide toward fake-tree heresy is apparently normal.  Young families with small kids more frequently opt for a real tree.  Retirees, less so.

Despite artificial trees being the clear winner in the Christmas tree war, there seems to be a robust and highly-opinionated debate over the environmental impact of real versus artificial Christmas trees.

Which I find just shy of hilarious, given the context.  Kind of like obsessing about the environmental impact of plastic straws, as you sit in your Hummer waiting your turn in the McDonald’s drive-through.

In any case, as I contemplate buying a bunch of gifts that my family doesn’t need, I find it hard to get exercised about the impact of the Christmas tree itself.  Virtually every material Christmas gift will have been made overseas and shipped here in single-use packaging.  Which I will then re-wrap using yet more single-use wrapping paper.  Because it’s Christmas, and that’s how we do things here.  In that context, the difference between a once-a-decade purchase eventually destined for the landfill (fake tree) and a yearly purchase of some custom-grown compost (real tree) is lost in rounding error.   It’s just too small to matter in the grand scheme of the season.

Even more than that, the choice between real and artificial is more-or-less a wash, for the average purchaser, in terms of overall environmental impact.  Depending on whom you listen to, for the typical user, if you keep your artificial tree for enough years, you’ll have about the same environmental impact as the equivalent string of real trees.  The break-even point is five years’ use of an artificial tree (see this seemingly-competent .pdf life-cycle analysis).  Some say ten.  This one says 7 to 20.  Pick a number.   Some wing it and say never, based on what amounts to moral or emotional or other (e.g., fear) considerations.  But of the serious life-cycle analyses of the issue, somewhere in that five-to-ten year span, your N-year use of a steel-and-plastic artificial tree will have about the same environmental impact as growing, shipping, and disposing of N real trees.

YMMV.

So, for once, I just don’t care enough about the environmental impact to bother to look into it.  It’s just too small to matter, in this context.

 


Narrowing it down

My only environmental takeaway is that the longer the artificial tree lasts, the better.  But this immediately gives me three guidelines as I start to sort out what’s available locally and on the internet.

Unlit.  You can buy fake trees that are just fake trees, or you can buy trees that have Christmas tree lights already embedded in the fake tree.  Data pretty clearly show that trees with embedded lights have a shorter lifetime than unlit trees.  I’m not sure whether that’s literally due to lights breaking and burning out, or whether the persons attracted to the convenience of a pre-lit tree are more likely to dispose of a tree sooner.  That said, the (sketchy) fake-tree longevity data argue for buying an un-lighted artificial tree.  Plus, I already own lights.  And putting the lights on the tree is part of the Christmas tradition.

Green.  You can buy fake trees in a variety of colors, including ones that mimic snow on the tree.  Heck, you can buy them with the ornaments already (permanently) attached.  My take on it is that anything other than green is going to get old pretty fast.  And that, literally, the white plastics on white trees tend to yellow over time, particularly if stored in areas that are not climate-controlled, such as an attic or garage.

Better quality.  One huge drawback to buying a fake tree is that it’s a commitment.  Once you buy one, you’re pretty much stuck with it for the next decade or so.  You can’t in good conscience try it one year, decide that you’d rather have a real tree, and toss it in the trash.

Given that, even though I’m not quite sure how to judge this, I think that purposefully shopping the low end of the market might be a mistake.  In theory, all these trees are made from steel wire and PVC plastic.  So I’m not that worried about having a cheap tree fall apart.  It’s more that if the tree doesn’t look really nice, I’m less likely to want to keep putting it up.

The upshot is that I want a better-quality, un-lit, green Christmas tree.


Step 1:  Hitting Amazon as prep for hitting the thrift shops.

At first glance, it’s hard to make sense of the pricing of artificial Christmas trees on Amazon.  The price per foot, for the same model of tree, rises steeply with the height of the tree.  Below, increasing the height by 66% (from 4.5′ to 7.5′) increased the cost per foot by 180% (from $13/foot to $36/foot).  By contrast, I think that real trees are priced more or less the same, per foot.  You’d expect an 8-footer to cost about twice as much as a 4-footer, or zero percent change in the price per foot.  So the pricing structure of these artificial trees seems grossly at odds with what I’m used to, for real trees.

But just a little analysis shows that this steep increase with tree height makes sense.  For a given manufacturer and model of tree, pricing is pretty much a case of “you get what you pay for”.  The reason that costs rise so steeply with tree height is that the total volume of the tree rises faster-than-linear with tree height.  And the manufacturers more-or-less have to fill the volume of the tree with something.

 

To a close approximation, for this “family” of trees (same model, same manufacturer):

  1. The cost is about 7 cents per branch tip, more or less.
  2. The density of branch tips per cubic foot is roughly the same for all but the smallest tree.
  3. The actual height/width ratio falls as the height of the tree rises.

I think this, along with a look at a few similar trees, tells me roughly what I need to know as I go looking for a tree in my local thrift shops.

Mostly, there’s no free lunch.  The pricing of these trees seems to be almost entirely a function of the volume of materials used.  Count the branch tips, multiply by a few cents per branch tip, and that’ll be the price.

In addition, it appears that manufacturers of a given model of tree shoot for some more-or-less uniform density of branch tips per unit of tree volume.  Turning that on its head, for a given desired density of branch tips per unit of volume, I should be able to select any size of tree, and still be able to meet that goal.

So, with Amazon as the baseline, I think I ought to be able to look at trees and tree prices, across thrift shops, and make some sort of informed judgment.

Post #1900: The USDA released a new map of U.S. plant hardiness zones this week …

 

Source:  Maps are from USDA.  I added the line marking the boundary between hardiness zones 5 and 6.

… and nobody cared.

Which is a good thing.  I think.  On balance.

On the one hand, it’s good that they released it.  That’s my take on it, knowing the controversial history of the USDA hardiness zone map.

On the face of it, the red lines on the map above simply mark a data-defined boundary. Below that line is the area where winter temperatures should be expected to stay above -10F.  That’s based on the 30 years of local weather data, prior to the map date.  As the U.S. winter nighttime temperatures have warmed, those lines are moving north about 5 miles per year, in Missouri.  And, as I understand it, at roughly that rate, averaged across the entire U.S.

Back to the here-and-now, if you look at the illustration above and immediately say, hey, what happened to the circa-2002 map?  Why did they skip a decade?  Then you get an interesting story.

The answer is, Republican administration.  The Bush Jr. administration just somehow couldn’t quite seem to get around to allowing the public to see the updated version of that map.  The widely-held presumption is that they withheld the information precisely because it showed what I’ve highlighted above:  the USDA hardiness zones are migrating north.  That’s easily-grasped evidence of the early impact of global warming on the U.S.  And so that information was suppressed.

(This, despite the nonsensical CYA language that the USDA insists on including in the footnotes to the description of the map methodology.  They seem to say that “climate change” requires 50 years of data, and since each individual map only covers 30 years, you can’t infer that this is the impact of climate change.  Despite the fact that the underlying span of data across the full set of maps is now more than 50 years.)

On the other hand, I think those changes ought to get more press coverage.  This isn’t natural variation.  This is a clear and understandable signal of global warming’s initial effects.   And as slow as these changes are, relative to a human lifetime, there’s nothing on the horizon to suggest that they are going to stop any time soon.  Five miles a year doesn’t sound like much, until you realize that the U.S. is only 1000 miles north to south, and that things will move a lot faster once global warming really gets rolling.  And that it’s fairly hard to grow corn and wheat in a sagebrush and cactus desert.

So, even though I’m still in Zone 7, I think this deserves more press than it has gotten.  And I think that the Bush-administration suppression of the circa-2002 map needs to be remembered, right alongside the temperature data.


What are we talking about?

Source:  USDA.  I removed some details from the map (e.g., degrees C scale) to make it clearer.  Thus, I must say that: a)  the map is not the official USDA Plant Hardiness Zone Map, and (b) the USDA-ARS and OSU logos are eliminated.  If you want to see the full official map, follow the link.

The map above shows the coldest wintertime temperatures in each year, averaged across 30 years of data.  The 2023 map literally uses weather data from 1991 to 2020.

The map provides guidance as to what perennial plants can usually be expected to survive the winter, unprotected, in each location. 

That’s guidance, not certainty.  As the owner of a lime tree, I am acutely aware that citrus trees will typically die back to the ground if they go below about 28F.  Plausibly, you need to live somewhere near Zone 10 or higher (e.g., Florida) before you can expect your citrus trees to survive reliably, out-of-doors, unprotected.  Even so, the occasional freeze will hit Florida, so significant frost damage to Florida citrus groves seems to occur every few decades or so (reference).

More generally, if you ever buy a perennial plant from an on-line nursery, they’ll let you know the hardiness zones in which the plant is expected to survive.  Or they’ll give you information such as “hardy down to 0F”, and leave it up to you to know what USDA hardiness zone you live in.

It’s not hard to get your hands on the underlying data from which these maps were created, for example, via NOAA.  I’ve plotted the annual wintertime lows before, for the weather station at Dulles Airport.  Here’s 60 years of wintertime lows, as recorded at Dulles.

The obvious upward trend that you see above is pretty much the norm for most of the U.S.  So it’s no surprise that the revised USDA map shows those plant hardiness zones creeping northward.

In fact, my location (Vienna VA) graduated from Zone 7A (expected annual low of 0F to 5F) to Zone 7B (5F to 10F).  I was firmly in the middle of 7A, now I’m barely at the edge of 7B.  That’s reasonably consistent with the increase in wintertime minimums shown in the Dulles data above.


Footnote:  Hardiness zone creep exaggerates average warming

One final footnote is that, due to the nature of C02-driven global warming, the northward creep of the hardiness zones exaggerates average warming.

The reason for this is simple:  The largest impact of global warming is on nighttime temperatures.  (E.g., via Scientific American)And on winter temperatures (E.g., via Axios).  By inference, the biggest impact of all should be on nighttime winter temperatures.  And, typically, the annual low temperature in an area is set during the course of some winter night.

If nothing else, knowing this is a quick way to dismiss denialist arguments that, somehow, the observed warming on earth is due to changes in the sun.  (That, despite direct satellite measurement of solar irradiance, dating back to the 1970s, showing no such thing.)  The fact is, the warming is more pronounced at night, and in the winter, both times of limited sunshine.  Heuristically, if enhanced atmospheric C02 is a blanket, that blanket matters more when it’s cold and dark.


Conclusion

The real lesson here isn’t the map, per se.  Anyone who cared to analyze the publicly-available weather data — as I did above — would already have a strong expectation that the official USDA climate zones would continue to move northward, in this most recent update of the USDA map.

Really, the big lesson here is the missing circa 2002 map.  There was a time when Republicans so thoroughly insisted in keeping their heads in the sand, on global warming, that they found excuses not to update this map.

Has that changed?  Are Republicans on board now, with the idea that global warming is real?   I doubt it, but there’s no way to know.  The last two iterations are both dated to periods with Democrats in control of the administrative branch of government.  So, as to whether or not a Republican administration would allow this to be updated on a once-a-decade schedule, I guess we just won’t know until we see it.  Or not.

Post #1899: Composting shed, testing

My tumbling composter doesn’t work in the winter. Which is ironic, given that it was made in Canada.  But it’s a common problem.  Winter composting is a problem for anyone who tries to compost small amounts of material outdoors, in a cold climate.  Composting stops as the temperatures drop.

So I made a little insulated shed, to fit around the composter. 

The upshot is that, so far, it seems to keep the compost around 16F warmer than it would otherwise be, without the shed.  On average.

I’m not sure that’s going to do the job. Continue reading Post #1899: Composting shed, testing

Post #1897: Re-using political yard signs. Composting shed, Part 2

 

In honor of election day, I’m re-using a bunch of political yard signs to build a small outdoor shed.  The Coroplast used for high-end campaign signs is far too good to be tossed out just because somebody lost an election.

I’ve decided on the following method of construction:

  • Coroplast campaign yard signs
  • Stapled to furring strips

It’s every bit as complex as it sounds. Continue reading Post #1897: Re-using political yard signs. Composting shed, Part 2

Post #1896: On re-using political yard signs: Composting shed, part 1.

 

Today is the day when a whole lot of campaign signs go straight into the dumpster.  Along with the political aspirations of half the recent candidates,

Which is a pity, really.  (The signs, I mean.)  The best of those signs are made to last a long time.  We really ought to do better than treating them as a single-use disposable.

So I suggest that the first Wednesday following the first Monday in November be declared Campaign Sign Recycling Day.  In keeping with that, today is a good day for me to make something useful out of some dead political yard signs.

This post is the theory.  Next post is the actual assembly.


We’re talking Coroplast.

Source:  Coroplast, Inc.

Campaign yard signs come in several varieties.

Cheap campaign yard signs aren’t re-usable in any obvious way.  Some are coated cardboard, on some sort of stick.  Some are a printed plastic sleeve that fits over a three-sided wire frame.  For both of those, the metal frames (if any) can be recycled.  But the signs themselves aren’t good for much.  Far as I can tell, once they’ve served their purpose, they’re trash.

By contrast, high-end campaign yard signs are Coroplast(r).  That is, corrugated plastic sheets — two sheets of plastic bound together with thin plastic channels.  As pictured above.  Effectively, they are built like corrugated cardboard, but plastic.

These sheets — typically made from polypropylene — have a surprising amount of structural integrity.  Much like corrugated cardboard, they are quite resistant to bending or folding across the corrugations.  This means you could  use a single thickness of Coroplast to build light-duty objects, and multiple thicknesses to build heavy duty objects.

These also stand up well to being used outside.  The ones forming the sides of my oldest raised beds now have more than five years of cumulative outdoor exposure (first as yard signs, then as raised bed sides.)  Only this year did they begin to show brittleness from all that sunshine and weather.  (And if I’d cared to keep them painted, I probably could have avoided that, as most of the damage is from exposure to the UV in sunlight.)


Fastenating

I’d say that the biggest downside is that these can’t be glued together.  (Or, at least, not well, or not easily, using conventional glues).  The underlying material (typically, polypropylene) just doesn’t stick to much.  And the ink coating — the printed message — further complicates things.

Near as I can tell, most people who make DIY projects with Coroplast sheet opt for some sort of mechanical fastening.  That can be as simple as cutting slots and tabs, so that sheets fit together.  Than can include melting sheets together, in places, to form a sort of plastic rivet.  Or can include using actual metal fasteners (bolts, washers, nuts) to hold the plastic parts together.  Or staple or nail them into a wood backing.

(The big exception being model airplane enthusiasts, for whom gluing coroplast is the only practical option.  That said, after having read one or two sites discussing that use, I’m convinced that gluing up Coroplast is not something that you’re likely to get right the first time.)

There are chemical methods that might, in theory, hold these sheets together.  Some are specialized glues specifically designed for this sort of application.  All of those appear to cost an arm and a leg, at least for the quantities that would be needed to build (e.g.) a piece of furniture.  And then there’s solvent-welding the polypropylene (PP).  That is, finding a solvent that will dissolve PP, dissolving some pieces of PP in that solvent, and then using that as if it were glue.  I strongly suspect that either approach — specialized glue, or DIY solvent-welding — requires a nice clean PP surface, involving a lot of complicated surface preparation, and that the ink firmly bonded to the typical campaign sign would interfere with that.

Dare I say this?  Even duct tape is iffy.  The same factors that make it hard for glue to stick, make it hard for tapes to stick.  And surface preparation for taping is not easy (e.g., lightly torching the PP surface).  All told, taping or gluing this stuff seems like a lot of work, on the off chance that you can get something to stick firmly.

The upshot is that I’m going with mechanical fastening only.


Never in small amounts

I find most plans for upcycling or recycling of materials to be of little value.  Most involve using small amounts of materials.  Most involve creating something for which there is a very limited demand.  The results tend to be more of a novelty than a way to divert significant amounts of material from the landfill.

Contrast that with using campaign signs for the sides of raised garden beds.  That used up a lot of material, slowed down the inevitable progress toward the landfill by years, and avoided consuming considerable amounts of virgin materials.

In this case, I have a stack of roughly 35 campaign yard signs, or about 100 square feet of Coroplast sheet.  Pre-cut into neat 2′ x 1.5′ pieces.  So I’m looking for a project that will use up just about that amount of material, and give me something useful in return.


Revisiting cardboard furniture

Source:  Google search

In Post #887, I did up a quick summary of the various construction methods used to create corrugated cardboard furniture.  I’d guess that just about anything you could build as corrugated cardboard furniture could also be built out of Coroplast.

So if you are stuck for ideas, you can look up cardboard furniture plans.  As long as they don’t depend critically on glue, they ought to work with Coroplast.

As I see it, the main approaches to creating weight-bearing structures for cardboard furniture are:

Simple stacked sheets.

Source:  Homedit.com

Folded beams

Source:  Time, inc.

Structural grids (with or without surfacing materials):

Source:  Planet Paper


Totes

Source:  Storage Techniques for Art, Science, and History

It seems worth mentioning that a lot of lightweight commercial bins and totes are made from folded and fastened sheets of Coroplast.  It’s such a common use that there’s even a market for used Coroplast bins and totes.

You can find lots of different plans on the internet for constructing Coroplast totes, bins, boxes, and so on.  They all boil down to folding a sheet into a box shape, and then somehow fastening it together at the corners.  In the example pictured above, the author constructs a sort of “rivet” out of hot glue, and uses that to fasten the corners mechanically (reference).

Here, I’m shooting for something larger, to use up more Coroplast signs.


From dead campaign signs to structural integrated panels.

Source:  Builder Bill

I’m going to turn my pile of used Coroplast into some structural integrated panels or SIPs.  In this case, the SIPs will be flat, rectangular wooden frames, faced with coroplast sheets, and filled with … probably scraps of insulating foam board.

Like a hollow-core door, if you’ve ever dealt with the insides of one of those.  The entire frame around the rim is solid wood, and so has enough strength to hold fasteners and hinges.  But the broad flat surfaces are just thin, rigid sheets backed by some hollow, honeycomb-like structure.

As long as those rigid face sheets stay firmly in place, the entire unit ends up being quite strong, given the light weight.  Far more than you might reasonably expect.  This is why (e.g.) you can easily use a hollow-core door as a table-top, even though the individual face veneers are far too flimsy for that use.

I think this takes good advantage of the strengths and weaknesses of Coroplast.  And it allows me to connect the Coroplast to the structure using a (hardware) staple gun, which is about as fast and as lazy as it gets.  But all the connections subject to high point loads — the sort of connector that would pull out of a thin plastic sheet — can be made through the solid wood edges.

And it’s generic.  I’m going to use this to build a little knock-down insulated shed for my composter.  But nothing would stop you from (e.g.) building furniture this way.  Bookshelves.  A larger shed.  A lightweight travel trailer.  Anything that can be made from rigid flat panels can be made this way, within the strength limitations of the materials.

 


From structural integrated panels to winter composter cover.

At this point, putting the composter cover together is just a matter of connecting the panels made in just above.

Ideally, I’d like to have “knock down” construction — something that can be easily disassembled and re-assembled without tools.  (That way, I can store it away easily during the off-season).  But in the end, this is only going to take four long screws to hold it together.  So I’m just going to screw it together.

How this actually goes together is going to depend on what scraps of lumber I build it out of.


Conclusion

In this post, I figured out how I’m going to use up a lot of 1.5′ x 2′ Coroplast campaign signs.  My proposed method is to build a bunch of “structural panels” out of those signs.  That is, thin wood frames faced front and back with Coroplast sheets.  And then use those rigid panels to build a structure.

This approach:

  • Uses up a lot of signs.
  • Doesn’t require gluing the Coroplast sheets to anything
  • Uses (hardware) staples as the main fastener
  • Avoids putting high point loads on the plastic sheets themselves, by placing all the “structural” fasteners into wood.
  • Is flexible — just make the panels different sizes.

All I have to do now is to make that happen.

I’m now going to test that, by building a winter cover for my composter, using that “structural panel” method.  Assuming all goes well, the construction of that should be documented in my next post.

Post #1895: Home testing for airborne mold spores, a quick review of options

 

This is a quick review of home testing for airborne mold.

Bottom line:  I’m going to start with some $3-a-pop agar plates (Amazon).  Despite numerous drawbacks.

We’ll see what develops.

Note:  Results are shown in Post #1898.


Intro

I want to check a few areas of my home for an excess of airborne mold spores.  This is a shot in the dark, so I don’t want to spend a lot of money on it, if I can avoid doing that.

I could hire a pro to do that for me.  But, cost aside, do I really want my tester to be somebody who’s primarily in the business of selling mold remediation services?  Particularly when you can expect to find some level of mold more-or-less everywhere.

So, I’m scoping out the test-at-home market.

Here are my notes.  I knew zip about this, as of two hours ago.  Here’s what I’ve learned in two hours.


Testing for airborne mold spores.

The first split in the decision tree is whether you are testing for surface mold or airborne mold.

Surface mold is … mold growing on a surface.  With those, you swipe a surface, then test the swipe in some fashion.

That’s not what I’m looking for.  I want a test for airborne mold.

Airborne mold is mold spores suspended in the air.  (For all intents and purposes.)  Mold spores are reported to range from about 3 to 30 microns in size, so some of those will float long distances/stay suspended for long times, in air.  Some will not.  (The cutoff for “airborne” particles is conventionally taken at 5 microns.)

The first thing I learned about airborne mold tests is that the price of the test typically does not include the price of the lab analysis of the test.  A typical lab fee is $35-$40 per test, and most places say that you need a minimum of two — one outdoors, one inside — to test for excessive mold.

What, exactly, the “lab test” does, varies from type of test to type of test.  For the agar-plate-style tests, they identify the types of mold that are growing.  For the air-sample tests, I’m pretty sure they give you a count of spores found.

Three styles of tests

Petri-dish agar tests:  Crude, and cheap if read them yourself.  (Amazon example)  One type of test is a Petri dish coated with sterile growing medium.  Take a sterile dish, uncover it for an hour, in a room where the air has been undisturbed for a while.  Then cover it up for a couple of days, in a warm place, and see what grows.

These seem to be sold as either read-it-yourself or send-to-the-lab tests.  Read-it-yourself boils down to counting the number of mold colonies that have formed, regardless of size.  Most common rule seems to be that four and under, for a one-hour exposure, visible after two days, is OK.

So the test is crudely quantitative, in the sense that you may see few mold colonies, or you may see a lot.  But there’s no direct link between the number of colonies you see, and the actual amount of mold spores in the air.

As I read it, a lot of factors can partially compromise these tests.  Mainly, there are several ways in which you can get false negatives (no mold on agar plate, when unhealthful levels of mold are present).  And, based on photos, it’s surprisingly hard to count the mold colonies.

I view agar plates/Petri dishes as a form of one-way testing.  If you end up with a plate dotted with mold colonies, after the one-hour-exposure/two-day-incubation routine, then you’ve found something.  If you don’t get that, or don’t get it clearly, then it’s not clear what you can conclude.   In other words, they may sometimes tell you that you have a mold problem.  Plausibly, they are not reliable for indicating that you don’t have a mold problem.

Around $3 a plate if you just buy agar Petri dishes yourself.  Around $40 a test if you want ones that you can send to a lab, and have the lab read them.  For lab-read tests, it looks like a minimum of two tests — one outside your home, one inside.

Air sample testers:  Quantitative, must be lab read, pricey(Amazon example.) A second type of test uses an air filter and a fan (air pump).  This is lab-read-only, but it has two big advantages.  First, the in-home portion of the testing is done in under ten minutes.  (Versus having an open Petri dish sitting around for an hour).  And the test is quantitative — the lab reading will give you some idea of how much mold was in the air.

I only found one on the market, and that rounds to $300 for three usable indoor tests.  Minimum of two tests — one outside your home, one inside.

Plus, at the end of it, you’re left with yet another useless battery-powered device to get rid of.  In this case, it’s the “air pump” used to draw a known quantity of air through the filter medium.

Dust swab:  Like a COVID test.  (Amazon example.)  Yet a third type of test asks you to swab the dust in a room, and test that for mold.  That looks very much like a COVID test, so I assume there’s a reagent there that reacts to some surface compound commonly found on mold spores.

There’s some chance that, like a COVID test, the results are a simple yes/no.  Yes, mold is present in the dust.  No, it’s not, or not at detectable levels.  So I’d call this a non-quantitative test.

Around $40 a test.

PM 10 air quality meter:  No.  I already own a meter that monitors airborne particulates (so-called PM 2.5 and PM 10).  A quick back-of-the-envelope convinced me that a PM 10 air quality meter probably wouldn’t function well as a mold detector.  (Independent of the fact that all kinds of non-mold material could be in PM 10).  Near as I can tell, there’s just too little mold in the air, at the limit of what’s considered healthy, to trigger a PM 10 meter.


Decision

I bought 10 sterile agar-coated Petri dishes, at $3 each, from Amazon.  Unless I want to ship them off to a lab to be “read”, this seems adequate, at least for an initial check.

That, despite their lack of … well, pretty much everything you want in a test.  But the bottom line is that, under the right circumstances, this will send up a warning flag if excessive amounts of mold are present.

This whole exercise is a shot in the dark.  And I’m not even sure what “normal” mold levels would look like, on any of these tests.  So this seems like just about the right place to start.

Post #1894A: A minor technical followup on the NY Times/Siena poll results

I’m still looking for loopholes.  Hence, three remaining questions:

  • How was the sample selected, and in particular, did it require a successful match from voter record to cell phone record?
  • What was the overall response rate?
  • How well does this benchmark with the actual 2020 results?

L2 file?

After reading the end-notes on the detailed tabulations of the NY Times/Siena College poll, my main remaining question is:  What is the L2 file?

Survey respondents were chosen (in a sophisticated-but-neutral way) from persons on the L2 file.  That file is the “universe of observations” for the survey.

Based on the U. Penn description, the L2 file contains public information on about 200M persons who recently voted.  And, about 95 million cell phone numbers.

The file itself was developed by L2.com.  Having dealt with mailing-list vendors before, I recognized much of the subsidiary information that they merged onto the publicly-available voter records.

But if that’s an accurate description —  95M cell phones, 200M voters — then roughly speaking, a bit less than half the L2 file had phone numbers attached to the voter data.

Did this survey draw from persons on the L2 file who had a phone number listed?  Or did it draw from all persons on that file.  The documentation simply says:

The survey is a response rate-adjusted stratified sample of registered voters on the L2 voter file.

I’m pretty sure they meant response-rate-adjusted, that is, they adjusted the likelihood of being sampled based on some prior estimate of likely non-response rate.

In any case, if the U. Penn description is correct, then this is a valid question to ask. Along with the obvious followup:  If it’s persons with listed cell phone, could that matching process — the process that added the cell phone number to the voter record — possibly have induced a bias?

Response rate?

The other thing not stated was the response rate.  They said that 94% of the people they called “were reached” on the phone.  Like this:

 Overall, 94 percent of respondents were reached on a cellular telephone.

But you’re left guessing as to what the actual response rate was.  At least, as far as I could tell, from the documentation cited above.  (The “reached” figure speaks more to the validity of the added phone data, than to the response rate. You can reach me, and I can say “no thanks”.)

Don’t people lie (on average) about how they voted in past elections?

That said, the big advantage this survey has is that it shows a modest win for Biden in these states, in 2020.  That is, it corresponds to the actual 2020 results.

Whatever their methodology goes, it accurately shows that Biden won the popular vote, by a small margin, in 2020.  It’s hard to say that the 2024 projection is hugely biased in some fashion, when you can see that no such bias exists for the actual 2020 results (as estimated from this poll).

Then I got to wondering:  Don’t people lie, after the fact, about having voted for the winner?

The problem is that if I Google anything near that topic, all I get is stuff about the 2020 election.  So any answer to whether or not this is material — if people tend to say they voted for the winner — will have to wait until I figure out some better way to find an answer to that.