How To Install Shingles Over Existing Roof

The first row of shingles should overhang the drip edge of the roof.

How to install shingles over existing roof.

Work from left to right or in a methodical way. 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. 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. You may want to wear work gloves to avoid injuring your hand or developing blisters.

How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Step 4 prepare for the shingle installation. Hope you like it. Do both sides first and then install ridge cap shingles over the top.

This will help keep any moisture from getting under the felt. 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. Continue installing the rest of the shingles by butting each new row snugly against the bottom of the existing row of shingles immediately above and nailing into place.

Yes you can install a metal roof over shingles. Install a layer of roofing felt over the roof before you begin installing the new shingles. Roofing second layer of shingles roofing. Around an inch should do.

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. But if the current roof is curling this isn t possible. 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. The felt should be secured every six inches with nails or staples.

Use a starter strip or cut pieces for a starter course. The layers of felt should be overlapped by 1 inch as you work toward the roof ridge. Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap. 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.

Here is a video on how we lay a second layer of asphalt shingles over existing asphalt shingles. 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.