Roofing Over Old Shingles

But before we get started one thing must be clear.

Roofing over old shingles.

Roofing second layer of shingles roofing. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. The felt should be secured every six inches with nails or staples. Damaged shingles should be removed to check the decking for problems.

Install a layer of roofing felt over the roof before you begin installing the new shingles. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. 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. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h.

Damaged decking will need to be repaired before you can install any new shingles. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Although many metal roof systems can be applied over an existing roof layovers are more commonly done with asphalt shingles. 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.

Adding new roofing over old sometimes called a re roof is possible only with asphalt shingles also called composition shingles. Choose a shingle style with the same dimensions as those on your. Although it sounds like a good idea we can assure you the cons heavily outweigh the pros. In fact the only pro to a shingle over is it s cheaper and cleaner.

When contemplating a new roof many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch.