Why Butyl vs Caulk under roof vent flange?
What is the primary advantage of butyl tape vs just using Dicor or similar caulk (not silicone) under roof vents, windows, trim etc? That bubble gum seems to never stop oozing. I'm not taking things a...
Forum Discussion
mike-s wrote:
Butyl tape (not caulk) is a bedding compound, it's meant to be squished between things to seal them.
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You bed a roof vent in butyl tape, screw it down, wait a day or two for it to squish out the edges, remove what comes out, then cover the seams and screws with lap sealant.
Butyl tape is probably the BEST sealant you can use, assume the device has an adequate mating flange and fasteners. This is all that experienced sailor use for their port lights (windows). It stays soft for many years.
2 things with butyl tape. Don't over tighten the mounting flange and press out all of the tape. What does squeeze out can be cleaned of waded up, stored in an air tight container and REUSE !
