Making sure the deck’s ready for underlayment—what’s your process?

wafflesd49 · 2026-04-14T09:41:26Z

I’m about to redo the roof (asphalt shingles, pretty standard, house is in the Midwest so lots of freeze/thaw) and trying to figure out how picky I need to be with the deck before rolling out the underlayment. The plywood seems mostly solid but there are a couple spots with old nail holes and a few questionable soft patches near the eaves. I’ve seen some folks say you should replace any questionable wood, others just patch or use some kind of sealer. Also, do y’all sweep it clean or actually wash it down? Is there a specific type of primer or treatment you’d recommend before the underlayment goes on? I don’t wanna overdo it but also don’t want to cut corners and regret it later. What’s worked (or not worked) for you?

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Roof Decking Repairs & Wood Rot Replacement

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Yeah, water always finds a way in, doesn’t it? I’ve had better luck since I started priming the deck before peel-and-stick—seems to help it grab, especially in our humid summers. Still gotta check seams every spring though... nothing’s bulletproof.

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