How do I weatherproof plywood
l am building a window perch for my cat, with a ramp. This will be done on
the interior and exterior of the window. The sliding part of the window
will be taken out and l will use 2 pieces of plywood sandwiched to replace
it. Once this is done, a cat door will be put in. I am not
concerned with the plywood in place of the window, since it is vertical. l
can use oil base primer and latex paint. What l am concerned with is the
flat outside perch and ramp. It will be more exposed to water, for sure. For this, would oil base primer and latex paint work, or do l need something stronger? l will be putting indoor/outdoor carpet on this part of the job. l live in Phoenix, where it is hot and once in a while it rains. When it does rain, it can be 1,2,4 days or a week straight, so there will be some water damage if left bare.
First, you need to use exterior or marine plywood. The glue in
regular plywood will fail outdoors even if it is painted or sealed. You
can paint, varnish, polyurethane or finish the exterior/marine plywood
however you want and not have to worry.
i would use pressure treated plywood and an out door stain
Thompson is water seal
I think an oil base primer and latex paint will be sufficient
for your area. You should be sure to put cocking around all openings of
the window because that is going to make a bigger difference than what the
wood is treated with.
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