Shingles must be installed with a slight overhang past the metal drip edge, typically extending between one-quarter and one-half of an inch. This intentional overhang prevents rainwater from clinging to the underside of the shingles via capillary action and running backward onto the wooden roof deck or fascia board. When professional roofers install starter strips and field shingles, they align them carefully to ensure this precise offset for optimal water shedding into the gutter system.
1 votes
Marked as accepted