The term 3-tab refers to the number of layers of shingles. When adequately secured with four nails per shingle, a 3-tab system has a wind resistance rating of 60 m.p.h.
The term 3-tab refers to the number of layers of shingles. When adequately secured with four nails per shingle, a 3-tab system has a wind resistance rating of 60 m.p.h.