The SBS is about 10 years old, and while still in good shape, there are a
couple of patches with barely detectable alligatoring. It is still very
flexible and will not crack or tear.
New SBS won't last 20 year and I want to finish this roof once and for all.
As far as once you put a nail through the SBS, is it really any different
that ice guard that you put down under shingles for 2 to 4:12 pitches? A
properly seated roofing nail is supposed to create a seal.
I could just put coating on the SBS every 5 years and probably get the 20
year objective. They say you cannot glue SBS onto Capsheet, but coating
sticks which is a contradiction.
Basically trying to figure how to get 20 years of life and NOT tearing the