How To Install New Roofing Shingles Over Exisyting Roof

But if the current roof is curling this isn t possible.

How to install new roofing shingles over exisyting roof.

Use a starter strip or cut pieces for a starter course. Cut the existing shingles and pry up carefully. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Always install flashing around a chimney and other valleys where two roof planes meet as these areas are more prone to leaks if not protected.

Attach with nails along the top edge of the strip. Apply roofing cement to the back. Leave the old valley flashing in place and install new over it. Install new shingles to the lower edge of the opening.

Remove the cover and then nail the old shingles back down again. Install new flashing metal flashing is often called drip edge along the bottom of the roof near your gutters. Nail the drip edge in place using your hammer and roofing nails. Rip cut the starter strip or starter pieces so that they butt up against the second course of existing shingles and are even with the front edge of the existing roofing.

You re better off removing the old roof. You need to tear off the roof and install a new one. If you nick or tear the old flashing piece then go buy a new one. Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in.