How To Install Shingles Over Existing Roof

Work from left to right or in a methodical way.

How to install shingles over existing roof.

Do both sides first and then install ridge cap shingles over the top. If the job is done correctly with the new layer of shingles laid flat over the existing shingles the old roof cushions the new one and serves as a secondary barrier should wind or water ever break through the new shingles. But if the current roof is curling this isn t possible. Install a layer of roofing felt over the roof before you begin installing the new shingles.

However you ll want to check with your local building department before you make any decisions. Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. Step 4 prepare for the shingle installation.

The felt should be secured every six inches with nails or staples. Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap. You need to tear off the roof and install a new one. This will help keep any moisture from getting under the felt.

1 remove the shingles before installing the metal roof the first way to install a metal roof over shingles is by completely removing the old shingles before installing the new metal roof. Roofing second layer of shingles roofing. Use a starter strip or cut pieces for a starter course. Yes you can install a metal roof over shingles.

Attach with nails along the top edge of the strip. The layers of felt should be overlapped by 1 inch as you work toward the roof ridge. So if there are already two layers the choice is made for you. 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.

How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Here is a video on how we lay a second layer of asphalt shingles over existing asphalt shingles. 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. The first row of shingles should overhang the drip edge of the roof.

Around an inch should do. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. You may want to wear work gloves to avoid injuring your hand or developing blisters.