I am almost finished a project for a client who is converting an old porch into a new space with basement, and it includes a small porch over the new front door. The architect specified pressure treated lumber for the construction. ( I am in Ontario, Canada). The client wants all the exposed wood to be painted white. I think that I should be using latex exterior paint over a good primer,such as binz. My helper used to work for a painter who loved to use oil paints on all his interior trim, and he thinks I should use oil on this job too.
Articles I have read in FHB seem to suggest that latex is the way to go on exterior work, primarily because it breathes, and the moisture in the wood won,t push it off.
So, any opinions would be apreciated,, including how long the PT needs to weather before it can be painted.
Thanks,
Stemreno
Replies
The PT has to be dry first if you use oil based or it will peel off. I used to use a lot of PT for exterior painted and would buy it 6-8 months ahead to let it dry but that gets expensive and a PIA, but the paint stayed on.
Now the latexes have finally come along to the point they are worth using - the better ones like SW Duration
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Since the lumber was dried before treatment all of the water is surface water so it dries fairly quickly.
The US Forest Products labs says dry to the touch, and that 1-2 weeks in warm dry weather. Of course when you convert that it metric it comes out 6 hectacres <G>.
But it was only kiln dried to 19% so it still has some moisture to give up. So, as Piffin mentioned, painting with latex primer and paint is the thing to do.
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