Best screws to attach WH to foam board?
Trying to seal up exterior gaps before winter. Started with the water heater that was pulling off the wall. I tried to tighten it months ago. But noticed all the screws on the right side were stripped...
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Foam screws. In all seriousness, in a situation like that, I'd be adding a backer strip of wood to the inside and use longer screws. The original screws were intended to catch the fiberglass exterior surface, but it sounds like that's too far gone.
