Does all the old butyl tape need to come off?
Getting ready to leave on vacation tomorrow and noticed the vent in the cabover was leaking. I stuck eternabond tape over the old butyl tape as I was advised it was alright, but it didn't stick proper...
Forum Discussion
sasq40 wrote:
Yeah I tore it all down and have all the vents ripped off. Just grabbing some mineral spirits and plastic scrapper to get the old stuff off. The old sealant was butyl on the bottom edges and it was overlapped on the edge over the screws. Is that still the best option? Local rv place doesn't carry eternabond, only stuff they have is 4" x 25' for 100$
Yes, careful with the mineral spirits on rubber roof.
Since youve gone to effort to remove vent, lapping with tape, eternabond etc, not needed. Using butyl tape under flange is best under the vent. (butyl shouldn't lap over onto top though),
Normally what butyl squeezes out after a while is trimmed off, then perimeter and screws are liberally caulked. Dicor self leveling on rubber roof is the more common used.
