On roofs from 2:12 to 4:12, start with a 19-in. starter course, then lap succeeding courses by 19 in. With a standard 36-in. roll of felt, this will provide double coverage.
On roofs from 2:12 to 4:12, start with a 19-in. starter course, then lap succeeding courses by 19 in. With a standard 36-in. roll of felt, this will provide double coverage.


Visit the JLC Field Guide or a complete professional reference guide on Roofing with Asphalt Shingles.