How To Install New Roofing Shingles Over Exisyting Roof

Because asphalt shingles are routinely exposed 5 in rip down the first strip the starter course so that it is 5 in.

How to install new roofing shingles over exisyting roof.

You re better off removing the old roof. Install new shingles to the lower edge of the opening. 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. If you nick or tear the old flashing piece then go buy a new one.

To install line the valley with underlayment secured with roofing cement. You need to tear off the roof and install a new one. 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. Install new flashing metal flashing is often called drip edge along the bottom of the roof near your gutters.

Cut the existing shingles and pry up carefully. Use a starter strip or cut pieces for a starter course. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. But if the current roof is curling this isn t possible.

Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Remove the cover and then nail the old shingles back down again. Apply roofing cement to the back. Nail the drip edge in place using your hammer and roofing nails.