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lnlogauge
lnlogauge HalfDork
12/30/22 2:34 p.m.

Heading back to the orange store, because I naively assumed a 2x2, and a 2x4 are the same thickness.  I googled, both are supposed to be 1-1/2 thick. So what the f is this? I checked receipt. It says 2x2. 
 

Datsun310Guy
Datsun310Guy MegaDork
12/30/22 2:43 p.m.

Are those deck posts?  Not a 2x2?

alfadriver
alfadriver MegaDork
12/30/22 2:46 p.m.

Here's the other head scratcher- if you didn't get treated boards, the 2x2 thickness would be the same as a 2x4.  Why are treated 2x2 that small????  Makes no sense.

llysgennad
llysgennad HalfDork
12/30/22 2:52 p.m.

Which one is wrong? I've gotten treated boards that measured a good 3/8" too BIG before they dried out. Still a little big even after that.

lnlogauge
lnlogauge HalfDork
12/30/22 3:30 p.m.

2x4 is exactly 1-1/2. 2x2 is less than 1-1/4.

TJL (Forum Supporter)
TJL (Forum Supporter) Dork
12/30/22 3:39 p.m.

Last "2x2" i messed with was purchased as a 2x2 but was a ripped 2x4 and was 1/8" wider on the ripped side

bearmtnmartin (Forum Supporter)
bearmtnmartin (Forum Supporter) GRM+ Memberand UltraDork
12/30/22 3:46 p.m.

It depends how many times they run them through the planer. A 2x4 is sawn to 2 inches by 4 inches and for construction one pass through the planer is enough and removes 1/4 inch per side. But the 2x2 you show is a finishing product and has been run through a second time for extra smoothness.

ShawnG
ShawnG MegaDork
12/30/22 3:57 p.m.

That 2x2 looks like handrail. 

As was said above, it's been passed through a shaper, not just a planer.

alfadriver
alfadriver MegaDork
12/30/22 4:18 p.m.
lnlogauge said:

2x4 is exactly 1-1/2. 2x2 is less than 1-1/4.

For the treated.  But I just measured some untreated ones at 1 3/8 x 1 5/8.  

Trent
Trent PowerDork
12/30/22 5:36 p.m.

It's almost like referring to something by an arbitrary dimension that is totally inaccurate might cause some confusion.  Who would have guessed that would be an issue?

1988RedT2
1988RedT2 MegaDork
12/30/22 5:57 p.m.

I have been known on more than one occasion, to rip 2x4's on my table saw for this very reason.

At least a 4 x 8 sheet of plywood still measures 48" x 96".

OHSCrifle
OHSCrifle GRM+ Memberand UltraDork
12/30/22 6:48 p.m.

Those look like railing pickets mislabeled as 2x2's

ShawnG
ShawnG MegaDork
12/30/22 7:37 p.m.

2x2 in the lumber yards here are finger jointed garbage but they're 1.5 x 1.5

It's cheaper and you get better lumber if you buy 2x4 and rip them down to 2x2 when you need it.

alfadriver
alfadriver MegaDork
12/30/22 9:19 p.m.

In reply to ShawnG :

Cheaper, but you end up with boards that are not square.  1.5x1.75  Which can be a pain.

lnlogauge
lnlogauge HalfDork
12/30/22 9:50 p.m.

In reply to ShawnG :

Pressure treated railing in my Home Depot search brings me 2x2x42, so I guess? But it's not called railing, it's called 2x2.  there's nothing under a 2x2 it could be mislabeled as.

to clarify, I bought the 2x2x8', not 42.

06HHR (Forum Supporter)
06HHR (Forum Supporter) Dork
12/30/22 9:57 p.m.

I'm about to start on a new fence for my backyard, you guys got me wondering if 2x4x8 still means an 8 foot 2x4. Guess i'm making a run to Lowe's before I start digging post holes for 4x4's at 8 feet apart. 

Streetwiseguy
Streetwiseguy MegaDork
12/31/22 8:05 a.m.

My pet peeve is that 3/4 inch plywood is now often 18mm thick.

Could your 2x2 be 4 cut from a 2x6?  5 1/2 ÷ 4= 1 3/8 or so, if my early morning mental arithmetic is accurate.

SV reX
SV reX MegaDork
12/31/22 8:55 a.m.

Yep. The stuff varies. 
 

And it will change again as it dries out. 

SV reX
SV reX MegaDork
12/31/22 9:01 a.m.

Generally, pressure treated wood is delivered thicker than normal. Because the pressure treating process fills the dried cells of the wood and it expands. But it will shrink again when it dries.

Railing spindles have a much lower turnover rate than 2x4's, so they sit on the shelf drying (and shrinking) more before they are delivered. 
 

But the original cuts also vary.

SV reX
SV reX MegaDork
12/31/22 9:15 a.m.

When trees are cut, they are near 100% moisture content.

Framing lumber is typically dried to a moisture content between 9% and 14%. Finish interior wood products are typically dried to 6%- 8% moisture content.

A 2x10 can shrink up to 1/2" when the moisture content moves from 30% to 14%. 
 

Pressure treating usually kiln dries the material first to about 19% (to make space in the cells to absorb the preservative), then introduces preservative bringing the material back up to 75% or more.  Drying processes after that vary, but it is often nearly 30% when purchased in the store

DeadSkunk  (Warren)
DeadSkunk (Warren) UltimaDork
12/31/22 9:21 a.m.
06HHR (Forum Supporter) said:

I'm about to start on a new fence for my backyard, you guys got me wondering if 2x4x8 still means an 8 foot 2x4. Guess i'm making a run to Lowe's before I start digging post holes for 4x4's at 8 feet apart. 

My local box stores all sell 8 foot 2x4s in two different lengths.......8 foot or 7 foot 9 inches. Measure before you load the cart.

RX8driver
RX8driver Reader
12/31/22 10:05 a.m.
bearmtnmartin (Forum Supporter) said:

It depends how many times they run them through the planer. A 2x4 is sawn to 2 inches by 4 inches and for construction one pass through the planer is enough and removes 1/4 inch per side. But the 2x2 you show is a finishing product and has been run through a second time for extra smoothness.

That is where it originated, but these days they cut it to be much closer to the target size and plane off much less than 1/4". Sizes cut in the sawmill will partly depend on what the wood is to be used for, since if you make the target slightly smaller, you're more likely able to slip in an extra board into the log being cut and if you're just making studs, they don't care if the surface isn't 100% planed. If it's being cut for glue lam beams or such, it'll get cut thicker to ensure a 100% planed surface, since the gluing demands it. The wood going to the pressure treaters is planed while wet, then treated, so shrinkage is a bit varied and the final sizes won't be as consistent.

birdmayne
birdmayne GRM+ Memberand Reader
12/31/22 10:15 a.m.
DeadSkunk (Warren) said:
06HHR (Forum Supporter) said:

I'm about to start on a new fence for my backyard, you guys got me wondering if 2x4x8 still means an 8 foot 2x4. Guess i'm making a run to Lowe's before I start digging post holes for 4x4's at 8 feet apart. 

My local box stores all sell 8 foot 2x4s in two different lengths.......8 foot or 7 foot 9 inches. Measure before you load the cart.

The good ol framing stud. That got my exactly 1 time. I was very confused when I got home and they were just over a foot short of what I needed.

1988RedT2
1988RedT2 MegaDork
12/31/22 10:57 a.m.

My local Lowe's carries quite a few lengths:  the expected 96", the 93" framing stud that will produce a wall section 8' tall when combined with a sill and top plate, and other lengths including 10', 12', and 16'.  There's even a few at 104 5/8" and 105", which I suppose are framing studs for 9' wall sections.

Curtis73 (Forum Supporter)
Curtis73 (Forum Supporter) GRM+ Memberand MegaDork
12/31/22 12:17 p.m.
SV reX said:

Generally, pressure treated wood is delivered thicker than normal. Because the pressure treating process fills the dried cells of the wood and it expands. But it will shrink again when it dries.

Railing spindles have a much lower turnover rate than 2x4's, so they sit on the shelf drying (and shrinking) more before they are delivered. 
 

But the original cuts also vary.

Came here to say this.  The only really reliable 1.5" stuff will be if it's marked "stud."  The rest of it is more like "we started with a rough cut 2x4 or 2x6 and then smoothed it up for you."  5/4 deck boards are usually 1" thick.  2x4 and 2x6 are usually 3.5" and 5.5" tall, but when you get up into 2x8/10/12, the heights are usually 7.25/9.25/11.25" or something close to that.

You'll also find that studs are the only true length.  If you get an 8' stud, it's 96" on the dot.  If you get a 2x6x12, it will be more than 12'.  Sometimes by 1/2 inch, sometimes 4" longer.

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