I need to build a staircase from treated lumber and I would like to use
Liquid Nail along with the screws. Would I really have to let the lumber
totally dry first? If not, would it just be a waste of glue?
I think it would be a waste of time and glue. Use the right screws,
use decent lumber, fasten it securely. . . . and in 25 years you can
take it all apart and put it on the other side of the house.
My Dad had some wet pressure treated wood. The stairs were
supposed to be about 7 feet tall, and they made em out of
wet PT wood. When the wood dried, it shrank. Finally the
contractors couldn't understand the problem. Dad took the
shrunken stairs, and took em to the contractor, in a paper
grocery bag. Set em on the desk and pointed to em.
Yeah, let the wood dry first.
If you wait for the wood to dry, you'll be waiting at least six months.
And that's if you keep it indoors, stickered, and dry. Treated wood is
so wet that driving screws into it makes puddles.
Wood shrinks mostly across the grain as it dries. The boards get
noticeably narrower, but not much shorter.
As long as the wood is dry on the surface, the construction adhesive
will stick. There are lots of variations on the adhesive. I haven't
seen one specifically for decks, but I wouldn't be surprised to find
one. Read the labels, pick the one that sounds most like your
application, follow the directions, and you'll do OK. The screws are
going to do most of the work anyway.
Hint: Be sure to use the proper screws for your deck, else you'll get
stains on the wood and corroded screws.
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