Using Drywall Screws For Building A Deck
by Diane Acton
(Evansville, IN )
I recently had a deck built and when a friend came to look at it I was told the contractor should not have used drywall screws on the Pressure Treated Wood. Is this so - are there codes against this?
It is a very bad idea to use dry wall screws with treated lumber. There are certainly ASTM codes which set out the coating specifications for certain types of fasteners to be used with ACQ treated lumber.
This is potentially a very bad thing because dry wall screws are for indoor use and are never in contact with copper and the other chemicals used to treat exterior deck boards.
What is likely to happen if you use drywall screws for building a deck is that the screws will begin to corrode and ultimately dissolve away. So you can imagine all the possible outcomes and none of them are good.
Clearly, this builder does not know this and should get up to speed with his or her building knowledge right away. They should also come back and remove the drywall screws and replace them with an ACQ compatible screw.