More window stuff
So far, I've removed and re-caulked with butyl tape three windows. I think that there are two reasons that Jayco windows leak after awhile:
1) Jayco uses foam tape, not butyl caulk, to install the windows.
2) My windows are Hehr. On the Hehr site, I read a document that says the hole that their windows are installed in should be 3/8 inch larger in both dimensions than the inside frame of the window. And, in the windows I re-caulked, this is about how large the hole is. But, when Jayco installed the windows, the windows were not centered. That means that for sure at the top and maybe on the sides the 1/2" flange that is the sealing surface only has about 1/8" of sealing area --- and maybe less on the side, if the window is not centered side to side. Sealing out water with 1/8" or less of sealing area with an inadequate caulking material will eventually make a leak. I was truly amazed to find that one of the windows I removed today had only 1/16" of the flange touching the side of the trailer - at top, around the curve. Wow.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch