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-   -   pressure treated 2x4's (http://www.diychatroom.com/f19/pressure-treated-2x4s-78924/)

BlueBSH 08-16-2010 02:51 PM

pressure treated 2x4's
 
I just got my shipment of pressure treated 2x4's today for my basement project (bottom plate is PT) while stacking them in the garage, I noticed some are very light like a normal 2x4... but some are very heavy, almost like they are full of water... do these retain water if the lumbar yard stored them outside? should I let them sit indoors for a while before using them? I'm not getting to the wood construction for a week or so, would that be enough "drying" time to aclamate to the indoors?

Ron6519 08-16-2010 03:22 PM

Sounds like you received a mixed batch. The light ones have been around awhile and the heavy ones are new. It will take a few weeks for the heavy ones to dry out.
Ron

BlueBSH 08-16-2010 03:24 PM

Quote:

Originally Posted by Ron6519 (Post 486856)
Sounds like you received a mixed batch. The light ones have been around awhile and the heavy ones are new. It will take a few weeks for the heavy ones to dry out.
Ron


Is it ok to use them before they dry out? I'm just anchoring them to the concrete then framing on top of them

Ron6519 08-16-2010 05:21 PM

Quote:

Originally Posted by BlueBSH (Post 486858)
Is it ok to use them before they dry out? I'm just anchoring them to the concrete then framing on top of them

Nobody ever waits for them to dry out. Best to secure them before they start to warp.
Ron

Gary in WA 08-16-2010 06:06 PM

Use some sill sealer under each against capillary action and for a thermal break from the slab/wall. P.t. wood is not waterproof, unless you special ordered it as such. Nail tight to foam board on concrete, no gap to create convective loop behind the glass batt in the wall. Fire-code requires blocking every 10' laterally. http://www.greenbuildingadvisor.com/...-building-code

Be safe, Gary

BlueBSH 08-16-2010 07:43 PM

Quote:

Originally Posted by GBR in WA (Post 486924)
Use some sill sealer under each against capillary action and for a thermal break from the slab/wall. P.t. wood is not waterproof, unless you special ordered it as such. Nail tight to foam board on concrete, no gap to create convective loop behind the glass batt in the wall. Fire-code requires blocking every 10' laterally. http://www.greenbuildingadvisor.com/...-building-code

Be safe, Gary


Already got the sill gasket foam (the stuff on a roll the width of the 2x4 that is about a 8th of an inch thick I think?) ready for that when I get to it. thanks for the blocking tip, didn't have it in my plan

eisert 08-16-2010 08:56 PM

Use them as soon as you can, don't wait for them to dry out. As pt lumber dries, it can warp and twist DRAMATICALLY.

forresth 08-17-2010 04:43 PM

the local lumber yard rachet straps and hoses down the PT after hours to keep it from warping.

if it warps on you dramatically, you can probably take it back and get usable boards.


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