I’ve seen more than a few horror stories where water got trapped behind the poly and turned a small leak into a full-blown science experiment. Here’s my two cents: if you’re swapping out a vanity, I’d cut the poly just above the base and tape it to the wall, then seal around any new plumbing penetrations with a good caulk. That way, if there’s ever a leak, you’ll spot it before it turns into black mold city. Honestly, I’d rather deal with a little wicking than have to rip out half the wall later. Just my experience—your mileage may vary...
Honestly, I’d rather deal with a little wicking than have to rip out half the wall later.
Cutting the poly above the base makes sense. I ran into something similar—thought I was being smart leaving it intact, but then found a damp patch months later. Wish I’d known to seal around the pipes better. Did you use regular silicone or something special for caulking?
Yeah, sealing around those pipes is one of those things you don’t think about until you’ve got a soggy mess. I’ve tried a bunch of caulks over the years—honestly, regular silicone works fine most of the time, but I’ve started using the higher-end stuff made for kitchens and baths when I’m worried about mold. It’s a bit pricier, but seems to hold up better in damp spots. One time I skipped it and ended up with a funky smell behind the vanity... not making that mistake again.
One time I skipped it and ended up with a funky smell behind the vanity... not making that mistake again.
Totally get that—those little details make all the difference. I always remind folks: take a minute to mask off the area for a neater caulk line. It’s a small step, but it makes everything look so much more finished. And yeah, investing in the mold-resistant stuff is worth it, especially in tight, damp spots.
Honestly, I learned the hard way that measuring twice isn’t just a saying—it’s survival. First time I swapped a vanity, I eyeballed the plumbing and thought, “Eh, close enough.” Spoiler: it wasn’t. Ended up with a half-day detour at the hardware store. And yeah, caulk lines matter, but don’t sleep on double-checking your shutoff valves... trust me, you don’t want a surprise shower mid-install.
