How To Install Shingles Over Existing Roof

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.

How to install shingles over existing roof.

The first row of shingles should overhang the drip edge of the roof. 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. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one.

Step 4 prepare for the shingle installation. 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. Install a layer of roofing felt over the roof before you begin installing the new shingles. The layers of felt should be overlapped by 1 inch as you work toward the roof ridge.

This will help keep any moisture from getting under the felt. Use a starter strip or cut pieces for a starter course. Attach with nails along the top edge of the strip. 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.

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. Do both sides first and then install ridge cap shingles over the top. 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. Around an inch should do.

But if the current roof is curling this isn t possible. Hope you like it. 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.

However you ll want to check with your local building department before you make any decisions. 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. 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.

Work from left to right or in a methodical way. Yes you can install a metal roof over shingles. So if there are already two layers the choice is made for you.