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This is a single 1.5-inch by 75-foot roll of black double-sided butyl tape from Crawl Space Ninja, made in the USA. It uses an aggressive rubber-based adhesive on both faces and is built for field seaming and repairing polyethylene and polypropylene panels, sealing vapor barriers to concrete, plywood, OSB and foam board, and bonding glass, metal, wood and many plastics. The double-sided format lets it join two surfaces without a separate adhesive, which is its main edge over single-sided flashing tapes. It suits crawl space and basement DIYers sealing a liner or patching a barrier; the trade-off is heat sensitivity, since the adhesive softens above 78°F and the roll needs cooling if it arrives warm.
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Rated 4.7 out of 5 across 33 ratings, buyers are largely satisfied with how well the tape sticks and seals. Complaints center on heat, since the adhesive softens in warm conditions.
Crawl Space Ninja Foundation Butyl Tape is a black, double-sided tape. It is a reinforced butyl tape coated on both sides with an aggressive rubber-based adhesive. The adhesive is designed for applications that need very high tack, peel and sealing properties. It is made in the U.S.A.
The tape bonds to porous, low-energy, cold and damp surfaces. It can be used for field seaming and repair of polyethylene and polypropylene film and panels. It also adheres to concrete walls, galvanized aluminum, plywood, oriented strand board, wafer-board and pink foam insulation sheet. It can seal between glass, metal, wood and many plastics.
The adhesive works best at 60°-78°F. Do not store the tape in areas above 78°F, because the adhesive can melt. If a roll is hot, put it in the freezer for at least 30 minutes.