
YaretziRyan wrote:philpom wrote:1/4" BCX is what I used for the roof. B side up, it's pretty smooth and the C side isn't visible. I put PMF on it using 7lb duck canvas, TB II and ultra premium exterior latex - so far it's perfect.
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Maybe not needed but the first 2 letters in plywood designations indicate the quality of the finish so a BC has one grade B side and one grade C side, grade A would be the best. X denotes that it is rated for exterior use like house sheathing or roof underlayment. For my walls I used an AA furniture grade hardwood ply since I wanted a smooth surface for the PMF and a beautiful wood grain visible on the inside.
Hey! I’ve used BCX plywood before for a few projects, and I’ve found it to be great for exterior use, especially with the X rating for weather resistance. It’s a solid choice for roofing, especially when paired with PMF, which adds a lot of durability. For the walls, if you’re looking for a smooth surface, I’d recommend going with AA-grade furniture plywood.
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