I am an installer by day and in office at night to review all contracts our sales guys sell before they get their commission paid. I occasionally sell something that is extremely complicated and l so high up and steep that a sales guy won’t go near. I have good experience in both sides.
Personally I am not overly fond of gaf but we do sell Some. Gaf is a lighter shingle than landmark and landmark pro-life which is great for the installer but probably not for the customer in the long run. We normally sell gaf as an alternate to certainteed for aesthetics when a customer wants a certain color ect.
Shingles used to be sold by weight, now days if you ask a rep the weight per sq it’s hard to get it out of them, they immediately try to change the topic of conversation.
Lately we have been seeking mainly landmark pro little heavier than landmark and a few bucks more so our guys are selling at same price.
There are better looking and performing shingles out there than IKO and tamco so we don’t even offer them unless that is specifically what a customer requests.
I personally I am not too fond of OC. They are very thin/ weak in the middle section. Their sure nail, or whatever they call it strip in the middle makes it almost impossible get them out in one piece when repairs are needed… Ie replacing vent pipe coller or replacing 1 shingle that gets hit by a tree branch.