We recently had OC Duration shingles installed on our roof and I am concerned they may not honor the warranty because of some installation issues. In their warranty they state that the “installation must be in accordance with our written installation instructions and comply with local building codes.”
The installation instruction state the measurement for exposure, offset, and nail pattern. In about a dozen locations you can see a nail head in between the shingles ends. Also there are about a dozen places where the nail head is about half exposed from the shingle above (exposure is wrong). There are complete courses where the entire row has an offset of about 2 inches. Last, there are many places where there is a nail within 2" of the shingle ends.
Owens Corning gives specific measurements in their instructions and non of the above is correct.
If the exposure is to be 5-5/8", Offset 6-1/2", no nails within 2" of any shingle ends, No exposed nail heads, WHAT IS AN ACCEPTABLE DIFFERENCE? 1/8"? 1/4? 3/8"?
I realize they only insure the shingle and not the installation but the way I understand it the will not even warranty the shingles the way it was installed.
What do you think?