Re Roofing A House Over Existing 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.

Re roofing a house over existing shingles.

When roofing over your existing shingles can be a good idea. But before we get started one thing must be clear. When you should tear off your roof and start from scratch instead. Prep work for re roofing over asphalt shingles inspect the condition of the existing roof and roof deck for numer of roof layers soundness of roof decking smoothness.

Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. Let s start with the good. You can t do it with wood or slate for example and you should never mix materials such as laying asphalt shingles over cedar shakes. Install a layer of roofing felt over the roof before you begin installing the new shingles.

Watch for damaged or un sound roof decking. Remove the ridge caps. Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement. Doing it now will make it easier to keep the reroofing job clean.

It can only be done once so if you already have two layers of roofing in place reroofing is not an option for you. Investigate strip shingles entirely and replace roof sheathing as needed. Nailing new shingles over existing ones is less expensive and faster requiring less labor but it also means you lose the chance to assess the sheathing for signs of water damage. How to do it remove caps.

If a shingle is. Why installing new shingles over old shingles can be good. Remove air vents and pipe flashings by prying out or unscrewing the fasteners holding the fixture. The layers of felt should be overlapped by 1 inch as you work toward the roof ridge.

All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. Adding new roofing over old sometimes called a re roof is possible only with asphalt shingles also called composition shingles. The felt should be secured every six inches with nails or staples. If your roof is in good shape but has some damage to one side from a downed tree or has lost shingles in a wind storm an overlay is worth considering.

Use a flat pry bar. This will help keep any moisture from getting under the felt. Reroofing is the process of layering one set of new shingles over a set of existing shingles.