CrawlSpace-DIY 1.5” x 100’ Butyl Sealant Tape (8 Pack) – Waterproof Butyl Rubber Repair Tape for Vapor Barriers, Windows, RV, Boat & Roof Patching

I recently tackled a DIY crawl space encapsulation project, and this butyl tape from CrawlSpace DIY was an absolute game-changer. Right out of the box, it's clear you're getting a high-quality product – thick, flexible, and packed with that reliable butyl adhesive that pros swear by. This product it's exactly what I needed to seal vapor barriers to concrete and cinder block walls without any hassle. The tape is super easy to install: just cut to size and stick. It adheres beautifully to dry, dust-free surfaces, creating an airtight bond that gives me total peace of mind against moisture and air leaks. Pro tip from my experience: If you're working with rougher surfaces like cinder blocks, grab a heat gun and warm the tape slightly before applying. It conforms like magic, filling every little crevice for an even stronger hold. No bubbling, no peeling – just a rock-solid seal that held up perfectly through my entire project.

Great product and quick delivery! Looking forward to encapsulating my crawl space with this great waterproof double-sided tape!

Used ths product to attached vapor barrier to a brick wall in my crawl space. Product worked well, cleaned brick with wire brush, and used seam roller to press the tape on. Applied christmas tree fasteners through vapor barrier and tape. Initially shipping was showing a week, but recieved within 2 days. Bought this product because of lack of other tapes that were smaller than 1.5'' And 2'' tape from other distributors were quite a bit more expensive.

Really good stuff- I tried two different manufacturers, and this one was definitely sticker, thicker, and seemed to seal better. Would prefer this again.

Very sticky. Reminds me of tar. I just installed this product. And it is holding the vapor barrier together. How long it holds up. Only time will tell. Will update later. Only gave 4 stars because I just use this product.

Easy to use and apply to concrete for vapor barrier for crawl space encapsulation

Used on block walls in a crawlspace area. Tape is very sticky on both sides. Stuck very well to the wall and material I used. Great product.

This sealant tape worked great. We applied the tape onto cinder blocks and the vapor barrier stuck to the backside of the tape, so well, we did not use any anchor screws.