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Discussion Starter · #1 ·
I need to use 1/2" plywood or OSB on both vertical sides of my retrofitted window frame. I was wondering if there is any difference in OSB (cheaper) vs plywood (more pricey) for this application considering that if somehow moisture got in (which I'm making sure it doesn't but who knows) and the material gets soaked and swells (like I think OSB is more likely to in moist conditions), it may squeeze the window on the sides too tight, causing it to break.
 

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I was building out at the framing level to bring the studding even with the brick to brick for replacement windows.

I choose plywood and covered all but the narrow room side with Protecto wrap. Probably overkill since water should not penetrate to that area but it did not cost that much extra and I know I did the absolute best that I could do.
 
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