Butyl Tape vs Dicor Self Leveling
I am about to install a Fantastic Vent and replace the skylight over my shower. The skylight manufacturer says specifically to use a butyl sealant that comes in a standard caulking gun size like th...
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Actually the skylight supplier Icon Direct directs the use of a butyl calk like Surebond SB-140 NOT a butyl tape. A generous bead goes between the vent and roof then around the edges and the screw tops.
The use of any other sealants is not recommended.
When I removed my OEM skylight, the manufacturer installed it with butyl tape and lap sealant over the top. The skylight integrity failed one one entire side where the screws were probably tightened too much.
My theory is such that being that skylight cover flanges are much thinner than a vent cover flange, the torque on the screws with the butyl tape under it caused an uneven spread of force on the skylight flange, eventually causing failure in such perfect symmetry round each screw.
Using a liquid butyl tape, provides the same seal, but would allow the torque from each screw to more easily spread throughout the skylight flange.
The use of any other sealants is not recommended.
When I removed my OEM skylight, the manufacturer installed it with butyl tape and lap sealant over the top. The skylight integrity failed one one entire side where the screws were probably tightened too much.
My theory is such that being that skylight cover flanges are much thinner than a vent cover flange, the torque on the screws with the butyl tape under it caused an uneven spread of force on the skylight flange, eventually causing failure in such perfect symmetry round each screw.
Using a liquid butyl tape, provides the same seal, but would allow the torque from each screw to more easily spread throughout the skylight flange.
