I had a new 30 yr GAF Architectural roof installed. The roof is not done right.
The Shingles have been nailed high above the marked line. The line is the guide for nailing which lets the nail penetrate the laminate of the shingle. Nails are typically about 1” to 1.5” above the line. There is a 16 to 20 inch gap between nails. The nails are overdriven. Also when they cut the ridge on top of the garage the plywood was damaged. Hence no place for nails to go through. Also some missing nails on the ridge cap.
Arm yourself with a copy of the manufacturer’s installation recommendations (you can download them from the GAF website)and call the contractor who installed the shingles. They need to make it right. Overdriven and improperly-placed fasteners will reduce the wind resistance of the shingle roof, no question.
Placing nails in the adhesive strip will compromise the bond. An adequately-sealed adhesive strip bond is very important to wind resistance. They may be able to hand-seal affected shingles after re-nailing shingles correctly.
Better if they can correct the problems before the adhesive strips bond. If they don’t and the adhesive strips have already bonded, the bonds will have to be broken on all the shingles and all shingles should then be hand-sealed to ensure a good bond.
You should confirm my advice with GAF tech support. I’d e-mail their tech support so that you have their response in writing.
I agree with Stop the Check!!! If your not satisfied with your contractor then do something about it. If your not sure about the installation methods then have it evaluated by another contractor then take action.
That is also not uncommon. I actually dont know of ANY jobsites where a re-roof was going on that someone looked at it. ( Authority Having Jurisdiction that is.) Thats after 15 years in the construction trades.