Re: shingle roof
Originally Posted by dj1
These are the two primary reasons for roof failures, first and foremost, staples are used instead of nails, guaranteed failure right there. Second is the pattern. For low risk situations, 4 nails per shingle is acceptable, for high wind/snow risk situations, 5 nails per shingle is recommended.
Originally Posted by Gizmo
As to the fastener, regardless of type, how it is driven is a key factor in failure. Staples, besides being inadequate, are frequently driven too deep, or at an angle, which turns then into a knife edge which cuts through the shingle with the slightest of breeze. Nails hold much better, even when slightly over driven, though ANY over driven fastener is likely to result in failure.
Yes, if the roof doesn't get warm enough to melt the glue and seal the tabs together, you've got a bit of an issue there as well, however, it doesn't take but a few hours of direct sunlight, above freezing to melt and start sealing the tabs down. Still, a properly driven nail will hold a shingle in place in moderate gusts and winds.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!