How To Install A Roof Over Existing Shingles

Install a layer of roofing felt over the roof before you begin installing the new shingles.

How to install a roof over existing shingles.

In a reroof job a special type of drip edge flashing is installed at the eaves and rake to wrap around the existing shingles. The rest of the shingles are full width. To install line the valley with underlayment secured with roofing cement. As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

The felt should be secured every six inches with nails or staples. 3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof. Before you begin installing the new shingles be sure to inspect the roof for any damage. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses.

Its front edge is even with the front edge of the drip edge. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Along the eaves install a new drip edge over the butt ends of existing shingles.

Apply roofing cement to the back. Damaged shingles should be removed to check the decking for problems. What you need power nailer or roofing hatchet tape measure roofing shovel or flat pry bar hammer drill carpenter s square straight cut tin snips utility knife chalkline broom. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

Venting the eaves to vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. To level out an existing asphalt shingle roof rip down reduce the height of two. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Leave the old valley flashing in place and install new over it.

Cut the flashing into 6 to 8 foot lengths to help prevent buckling after installation. This is by far the most common way to install a metal roof. So if there are already two layers the choice is made for you. But if the current roof is curling this isn t possible.

You need to tear off the roof and install a new one. There are already two layers of shingles on your roof most building codes only allow two layers of any type of roofing on your home.