I believe what you're saying BPC but I bet that felt is a lot more expensive which then makes you question using it. My point was finding a felt roofer who would put his money where his mouth is and give a decent guarantee.
As a qualified installer you should have faith in the products you use, I would always give 80 years + on all my products and that's because I believe in them.
As a qualified installer you should have faith in the products you use, I would always give 80 years + on all my products and that's because I believe in them.