#1: I am building a gazebo and want to use entirely
pressure treated wood (even for the roof and ceiling. Can
I use this material on PT wood?
Answer #1: Yes, but water and oil
are the enemies of Super Shield. PT wood comes wet and must
thoroughly dry to a moisture content of less than 12% before
applying this product. This could take as long as 6 months
from the time the wood is treated. Use a reliable moisture
meter to be sure.
Question #2: OK, can I build it with
something else because I don't want to wait 6 months?
Answer #2: Yes. An inexpensive alternative
would be to use PT wood for the substructure (posts in ground
contact and floor framing) and use tight knot cedar for
the decking, railings, roof and ceiling. That way you can
prepare the surface and get right to sealing your project
without delay. And tight knot cedar is currently only about
10% more than PT wood in cost. If you use a lighter colored
wood like spruce you might want to mix some stain into the
Super Shield. Experiment with some samples. If you are using
something subject to rot just be sure to apply the product
to all surfaces of each board in order to lock moisture
out so you don't have to worry about decay. Don't forget
to seal the ends of each board, too. That is where moisture
is wicked up.
Question #3: Kiln dried lumber costs
less than PT doesn't it?