I dont know why they have to lie about it. At $5/8ft board you'd think I paid for the full 1.5. Edit: I mixed up nominal with actual.
this post was submitted on 07 May 2024
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Shouldn't the normal size be 2? Given, well, the name?
You'd think so, but no.
Short story is the 'nominal' size is the size before going into a planer to smooth the faces.
Yes, it makes little sense, like many things related to construction stuff.
Yeah sorry. The tree was originally 50ft tall so we call the pieces that. But you only get 3ft
Is like buying 1200lbs steaks because that's what the cow weighs before it gets parted
Better example would be raw vs cooked weight of a 1/4lb paddy.
That's a very small area to grow rice in.
Or a very offended Irish person.
Exactly. Because it is easier to weigh the correct amount before cooking than find out you were wrong after.
But you should probably be feeding Patrick more.
It's not a 2x4 it's a "2x4."
And if you're a fan of quotation marks you could call it a "2"x4"."
You have to escape the quotes....
"2\"x4\"" or use differing quotes '2"x4"'
You did that on purpose, you misanthrope.
ah the infamous NaN lumber 🤣
The two-by-fours at your local home center are not 2 inches thick or 4 inches wide...not anymore at least. They spent several weeks at that size though. The sawmill cut them to that size to stack and kiln dry, and then when removed from the kiln they are then milled straight and square. Used to be they would sell the rough stock to carpenters who would do the milling themselves, but then they figured out that the railroads were charging them a fortune to ship a lot of wood that was going to be ground to sawdust anyway, so they started milling the boards before shipment. Same amount of construction lumber arrives at the construction site and it took less fuel for the locomotive to deliver it.
Lol. Trying to find lumber that's straight and square is a pipe dream these days.
It was straight and square when it was milled. Problem is that the big box stores cut corners during the kiln drying phase, so the boards have a ton of moisture still in them. As that dries, the boards twist and cup.
Plus poor protection from the elements at each storage step, which means rapid temp changes, which also causes wood movement.
Go to a local lumber yard. They tend to do a better job at kiln drying. You're still going to have warped boards, but far fewer in my experience.
Lumber is weird because it has been industry standard to lie about dimensions since before the US existed so it’s just kinda a thing they get to do
No its not Maybe in the US? At least here, it is and has to be, very precise especially when it comes to industry quality. It is precise down to the mm!
Yeah but they measure in feet and cheesburgers.
And lies, don't forget the lies
Alternative facts, thank you very much
How does that work when wood varies due to moisture content? If they give precise mm measurements, only 20% of boards will meet those criteria.
All they are giving is the planned dimensions instead of nominal in mm form, it’s still not precise, it can’t be.
Construction lumber, especially pressure treated lumber, is sold so wet I don't think it really matters. I've actually never tried to calculate wood movement for construction lumber because who the fuck cares? But for furniture lumber which is dried to between 6 and 14% moisture, there is a formula:
width of the board in inches x percentage of moisture change * expansion coefficient for a particular species.
Yellow pine (extremely common construction lumber) has an expansion coefficient of .00263. A 2x4 (actual dimension 1.5" by 3.5") that undergoes a 4% moisture content change will grow/shrink 3.54.00263 = 0.03682 inches, or just over 1/32". That's in width; it'll vary by less than half that in thickness. Wood basically doesn't move along the grain; the board won't get appreciably longer or shorter.
Bullshit. Wood expands and contracts so ther is no way you can be precious down to the mm.
It's not exactly a lie, just a standard. Nominal board sizes were based on the unfinished lumber size. Another 1/4 inch is taken off each side to get a smooth surface that makes it easier to work with.
Here's an old image (reddit warning)
https://www.reddit.com/media?url=https%3A%2F%2Fexternal-preview.redd.it%2F6Oy1DmXVFs0lyKxq9OmjaI-2gsPj8QO6joLlY1rB7m4.jpg%3Fauto%3Dwebp%26s%3D4fa73a2eaf8d96d4de26378be1ba9c404b210685
that shows the rough cuts of boards from a log. When they look at a log, they determine how many of each size they can get from it, and at that point, a 2x4 is 2 inches by 4 inches.
Why does the consumer need to know the dimensions at harvest when it's been processed multiple times?
That's like calling an 4oz can of evaporated milk a gallon because it came from a gallon of milk before processing (I have no clue on the ratio)
I it’s like calling a quarter pounder a quarter pounder. You are not getting a quarter bound of burger after cooking.
I agree with this. Use whatever system you need or want internally, but there's no reason to force whatever archaic or industry system onto a consumer. Logcutters also use a 1"=1/4 system and that is how they sell wood. A piece of wood that is 2" thick is sold as 8/4. Not 2". I get that they have their system but it seems dickish to force the consumer to use that system. There could be a good argument for it, but I've not heard one beyond "what, can't you do math?"
Sure there is. Look up the concept of a “standard” if you don’t understand the reasons.
Standards only work when they don’t change
It’s like a 1/4lb paddy being a different weight before and after cooking. They can’t tell you the final weight, since it’s always going to be different. Same with wood.
The woods final actual dimensions can vary, so they tell you its original size.
A 2x10 can be anywhere from 9-3/8thick down do 8-3/4 depending on how it dries.
Not entirely true. I lived in a house that was just over a century old. The framing was exactly what it said it was, a 2x4 was 2” by 4”. Same for all the structure. These were mill cut, but still pretty clean. It was WW2-ish and after that we started to get planed lumber that gave us 1.5x3.5. It wasn’t even until probably the early part of the 1900s that lumber started to become “dimensional”, as in the standard sizes we know of today.
As if american measurements have ever made sense. Look up how they measure screws or wires and despair.
Or shotgun shell sizes and loads.
"It all started in 1840 when the dram was a common unit of measurement..."
And they all had onions on their belts as was the style at the time.
Five bees for a nickel.
Expect for the .410 gauge. That one is a caliber, because reasons
It's a wonder they manage to build anything. They have pocket calculators dedicated to the building industry. It's surreal.
The convention is 2" before milling. Milling takes off 1/4"on each side, so the result is 1.5".
They were when the name was made, but due to changes in the manufacturing process, they aren't anymore. The name stuck, though.
https://www.popsci.com/two-by-four-lumber-measurements-explained/
So they can measure precisely, after all
Ans yet this piece is 1.28
It's due to the milling to square it.
You can get rough cut 2x4 or 2x2 or anything that are actually that size but by the time you trim and square it you will end up at the measurements sold in big box stores
Edit: I mean the size they used to be in store, not OPs version :(
It was done for largely sensible reasons.
https://youtu.be/WaJFudED5FQ?si=7j005FmfJVr_JQL_
In short, a 2x4 was originally 2x4 inches, full stop, but it was found that this size wasn't necessary for the strength being applied to them in construction. We were wasting lumber for no reason. They went through a few cycles of sizing down as the actual needed strength was understood better. The naming convention stuck, though.