Look back about 2 mos. ago. I posted on this topic. 219 #'s per sq. I was told. Evidently this is something not promoted by GAF, or harped upon by others as they will be going the same way. Or already have. Just look at the nonsense warranties.
Best warranty I know of is 20 yrs. for an O/C Classic, circa 1990. Other 'n that, the warranty is something for the consumer to buy into.>>>
The weight of the shingle is only relevant to the size and weight of the Granules. It is not more asphalt , fiberglass mat thickness etc. The granules are coarser or finer, that is it. Nothing to write home about Heck to make matters heavier they put the granules on the back side of some shingles . I'm not sure if this helps the longevity or not . Some one with many more years experience than I have could shed some light on this subject . Hey may be JET could chime in ????????????? :S :side: :silly: :woohoo: :side: :laugh: :laugh: :laugh:>>>
Probably not what it used to be!>>>