I’ve sent in the warranty papers a 2 shingle samples to IKO on this but I want your opinion on what is causing the cracking, lifting, and lack of good seal down on these 7 year old IKO 25 year shingles. It was a December/Jan install. Many pics, may take a while to load. It was about 70 degrees out when I took the pictures, they look worse when it is cooler.
I see places where partial shingles were used in the field and where it looks like they worked in from each end and lapped the shingles to make a joint. Are these approved intallation methods?
Contractor warranty is one year, if it is determined to be an install problem does that protect him fully?
This next, and last, pic is of the lap joint in the field.