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Old 04-28-2015, 02:09 PM   #1
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Sealing 3/4 Plywood Window Boxes


Hi everyone, I have some plywood boxes that I built to extend my windows out. I am adding a foam and new siding so the windows had to be extended a few inches out. No the plywood boxes I built (5 ply plywood) sticks a few inches out. I will be flashing the top of the boxes. But as an additional precaution I wanted to seal the plywood in case water (rain) got past the flashing. Also wanted to seal so the wood would not change dimensions if water got past the flashing too.

I was considering redgard since its for water proofing or shellac. But figured I would ask the wood experts.

Attached is a sample of the box, which sticks out of the wall sheathing.
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Old 04-28-2015, 03:33 PM   #2
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Are you moving the windows to be on the outer part of that? I'm trying to picture this.
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Old 04-28-2015, 04:07 PM   #3
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Yes, basically once the 1.5" inch of eps and the rainscreen is on the sides, the only part of the box that will be visible is the lip and the window inside the box. I am using 3/4 (5ply plywood) photo looks like 1/2 inch.
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Old 04-28-2015, 08:04 PM   #4
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Sorry buddy, no way is that going to work out.
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Old 04-28-2015, 10:36 PM   #5
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http://www.greenbuildingadvisor.com/...nergy-retrofit

Not really sure what the above comment is suppose to mean.
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Old 04-29-2015, 08:07 AM   #6
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If you are going to put 1.5" foam on the outside walls, there is a better way than that. Start by getting the plywood sheathing material on the outside and cut out the window openings. Then, before you add the foam, frame the openings with 2x3 or 2x4's to move the opening out the 1.5". This will give you a good nailing surface and ensure the window flange will be flush with the outer surface of the foam. You can then install the foam right up to the edge of the 2x framing and wrap it with the housewrap and install the windows and weather proof them as normal
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Old 04-29-2015, 08:35 AM   #7
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Sorry about that, I had a fire call and had to run.
danpik's reply was exactly what I was going to say.
Going to have to remove all of that plywood to do it right.
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Old 04-29-2015, 10:11 AM   #8
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Here is a quick Sketch of How we have done them in the past.

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