Thanks for the response / input. The problem is that A) I don't have the bag that the shingles came in (since they were installed in '93, I bought the home in '03, & original owner did not leave bag / extra shingles behind), & B) GP's denial of my claim included a copy of the "Limited Warranty," & ALL it says on the subject is, "Warranty Limitations...include...inadequate attic ventilation..."

As I mentioned in my previous post -- Feb 1, 2010 -- GP's denial of my claim states, "...it is [GP's] opinion that your ventilation is not properly balanced and additional upper ventilation may be necessary..."

Is that all that's required of them to deny my claim? Opinion? Where is proper balancing defined? MAY be necessary?

No, It sounds like their test showed excessive heat damage, venting codes vary State to State. You can further demonstrate by asking to meet with a GP rep. Have your attic confirmed by an HVAC co. before you meet.

does anyone know what the summit III shingle warranty is? I have a roof that was installed in 1987.

G.P. SHINGLES ARE DEFECTIVE,CHECK OUT 1,000 OF LAW SUITS.WE ARE CAPE COD,WE BUILT OUR HOME HUSBAND IS A BUILDER,FILLED OUT ALL PAPER WORK,TOOK PICTURES AND THEY DENIED,
THEY SAID ROOF DOES NOT LEAK YET. SHINGLES ONLY TEN YEARS OLD WTH A 30 YR, WARRANTY
CAN'T SUE OUT OF THE COUNTRY ( CANADA). SURE SOMEONE WOULD HELP!!! OUR ROOF ID NOW DOWN TO TAR PAPER VERY SERIOUS AND VERY EXPENSIVE TO REPLACE TEN YEARS LATER.MY HUSBAD IS 70 NOW AND CAN NO LONGER DO. ANYONE HAS ANY IDEAS PLEASE WRITE.

I installed my SummitIII roof in 1989, still looking good, but I'm starting to shop for replacements