Following a tip here on a thread "what's a good caulking" or something like that i have been using the sashco product lexcel for sealing off some holes like my shore power adaptor plate to my Bigfoot
shell and also the wickedly curved black and grey tank roof vents - no butyl tape used and I'm impressed with the lexcel. It is a quality product as far as I can tell, we'll see about long term thoughts..it sure is not workable once applied but careful planning ahead and steady caulking hand! helps.
Anyways I'm about to reinstall my 9x9 bathroom vent after getting it and the roof area all cleaned up, ditto for my new 14x14 fantastic fan
but! I'm at a stalemate. Do I opt for the original setup with a double layer of butyl tape installed on a hot day and then follow with some dicor lap joint. OR do I just use the lexcel only and hope I never have to remove either vent again. After the hours of prep work and scraping old silicone and dicor off, I want this to be as permanent and leak free fix as possible.
I was actually thinking of using a 3/8" wide foam rubber tape stuck to the inside of the vent flange closest to the roof hole , then liberal amount of lexcel around the outer portion and around eac screw hole. This way the rubber taper would not allow the flange when tightened down not to squish out all the lexcel, plus leave a gap for future cutting out the vent
if absolutely required...
Which method would you use to reseal the roof vents and why?