Can pressure treated lumber be effectively painted and if so what preparation should be done for good adhesion and finish?
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Getting the details right for a wall assembly with the control layers to the exterior and lots of drying potential.
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Replies
Let it dry completely. Prime w/ an oil-based primer. Paint w/ a quality acrylic exterior paint (S/W Superpaint comes to mind). Done deal.
I have painted a lot of pressure treated lumber that is kiln dried after treatment (KDAT) and some that had not been dried before purchase. If the lumber is wet, then I stack it carefully to prevent warpage with air spaces for drying for several weeks. When the lumber is sufficiently dry, then I prime it with an oil base exterior primer (Benjamin Moore's Fresh Start) and then topcoat with acrylic house paint. I have not had any problems with this method and some of my work is 6-7 years old.
Stan
What the previous two posters said - let it dry, oil primer, & acrylic final coat.
I'm adding that I've had no peeling or other form of failure on lumber painted 10 years ago.
With the new earth friendly ACQ we notice a build up of the treating compound(an alkaline salt) on the surface. It is a greenish powder. We have been scrubbing it off with water and a stiff brush then giving it at least 3 weeks in the Florida sun. Then oil primer. Then a quality top coat. Maybe we are wasting our time but if the oil primer can't get through the salt build up what is the point. I have already seen adhesion problems on a competitors work and ACQ has only been around a few years in our market so who knows what effect it will have long turn.
Good Luck