11 replies to this topic

[CougarCouple]

Stay away from pressure treat wood. Fasteners will be eaten away, even stainless. Use a 1 X non-treated and paint them before installing, with glue and screws.

Hi longhorn1
Not saying to use pressure treated, but was curious about the lumber destroying the fasteners. Don't they construct patio decks out of this material? I think deck screws are used to fasten the lumber together. I don't really have any experience with PT lumber.
Thanks Russ

[longhorn1]

Russ, about 10 years ago the treated wood used had chemicals that became illegal. High rates of cancer causing chemicals were found on playgrounds (in the lumber). The new treated wood chemicals desolved the fasteners. As a building envelope consultant I investigated roof failures caused by failure of the wood blocking fasteners. It didn't matter whether the fasteners were galvanized or stainless. They were destroyed. Metal roof decks that had wood blocking fastened to were eaten through. The roofing industry called for the ban of treated wood in all roof assemblies. jd