How To Install Shingles Over Existing Roof

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How to install shingles over existing roof.

Use a starter strip or cut pieces for a starter course. But if the current roof is curling this isn t possible. You may want to wear work gloves to avoid injuring your hand or developing blisters. Work from left to right or in a methodical way.

Here is a video on how we lay a second layer of asphalt shingles over existing asphalt shingles. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. The felt should be secured every six inches with nails or staples. Install a layer of roofing felt over the roof before you begin installing the new shingles.

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. Do both sides first and then install ridge cap shingles over the top. A benefit to doing it this way is that you can see if there is any rotten plywood that needs to be replaced before installing the new roof. However you ll want to check with your local building department before you make any decisions.

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. You need to tear off the roof and install a new one. Roofing second layer of shingles roofing. Step 4 prepare for the shingle installation.

Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Attach with nails along the top edge of the strip. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. So if there are already two layers the choice is made for you.

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. The first row of shingles should overhang the drip edge of the roof. Yes you can install a metal roof over shingles.

Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap. 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 layers of felt should be overlapped by 1 inch as you work toward the roof ridge.