How To Install New Roofing Shingles Over Exisyting Roof

Remove the cover and then nail the old shingles back down again.

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. Install new shingles to the lower edge of the opening. Cut the existing shingles and pry up carefully. You need to tear off the roof and install a new 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. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old 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. Nail the drip edge in place using your hammer and roofing nails.

To install line the valley with underlayment secured with roofing cement. Cut the flashing into 6 to 8 foot lengths to help prevent buckling after installation. Attach with nails along the top edge of the strip. You re better off removing the old roof.

To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Apply roofing cement to the back. Install new flashing metal flashing is often called drip edge along the bottom of the roof near your gutters. But if the current roof is curling this isn t possible.