Caulking around roof vents and ac unit
What is best way to do this? What type of sealant or caulk to use? How often should it be done. We have no leaks but just want to do preventive maintenance
Forum Discussion
Mfar1234 wrote:
To make sure I understand ... before using the Enterbond tape one should clean all of the old caulk off first - right?
To do the very best job that is what I would recommend, but be advised it is VERY, VERY labor and time consuming. You can put it over the existing caulking, but the general problem is that you want at least 1 to 1 and 1/2 inch of non caulking area on each surface (flange and roof) for the Eternabond to adhere to. Most caulking jobs don't have that on the flange itself and this would reaquire only a 1" width of original caulking to be around the item with it only going about 1/2 inch onto the flange and onto the roof for a 4" width strip of Eternabond to get that overlap. Also, existing caulking needs to be smooth enough so the Eternabond won't "tent" on the virgin surfaces that you are trying to get it to adhere to. I removed every trace of existing caulking on my roof before sealing it in Eternabond, but IIRC it took a good 4 hours PER VENT to clean all the old caulk off and prep it for sealing with Eternabond.
Many folks don't go to the lengths I did, but I'm not sure how durable there applications over the existing caulking will actually be, but many seem to have had success.
Larry
