I used to use tamko in conjunction with certainteed. Meaning if you called me and said I want you to be my roofer I would bring out both samples. I have Tamko on my own roof. However this year I made the decision to sell only certainteed. After inspecting a few jobs I have found that the shingles do not always seal. Just looked at another one wednesday 2 years old, some shingles sealed, some not.
I've mentioned this a few times on the forum and I seem to be the only one having this issue. Or maybe I am the only one who has noticed it. Too bad though, I used to really like Tamko.
The information found in this post is not to be considered legal advice. The author of this post takes no responsibility for any losses that occur. Use at your own risk.