Re Roofing A House Over Existing Shingles

Old shingles can curl over time.

Re roofing a house over existing shingles.

You need a flat surface to install a new roof over existing shingles. 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. Finally i had time to put the video clips together. There s a lot of visible damage.

Although it sounds like a good idea we can assure you the cons heavily outweigh the pros. Please click show more below to know. Adding new roofing over old sometimes called a re roof is possible only with asphalt shingles also called composition shingles. 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.

This process starts with a 5 inch starter strip fit along the eaves and set against the second course of existing shingles see figure 2 16. 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. Installation is easier than for a tear off job because you can use the existing shingles as guides for laying the new ones. 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.

You can do it. If conditions are right new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. Re roofing over existing shingles re roofing and roof replacements can be one of the biggest moments in a homeowner s life. In fact the only pro to a shingle over is it s cheaper and cleaner.

Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials. But you must take care to install shingles correctly so they lie flat. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. But before we get started one thing must be clear.

That fresh new layer of shingles and roof paint will help set the tone and overall ambiance of your home and roof for decades to come. If laying three tab shingles over three tab shingles it is important to nest the new shingles against the old to create a flat surface as friedman elaborates just below.