Posted 8/8/2006 10:50 (#33770 - in reply to #33762) Subject: Re: Thanks all
Deck grade CCA treated lumber comes wet so it shrinks madly. It has 0.40% retained treatment. Foundation grade comes kiln dried after treatment, but it has 0.60% retained treatment. Foundation grade doesn't shrink after installation. I made a 16' trailer deck from 2x6 and 2x8 cross wise three years ago. There's still no gaps between them.