Re Roofing A House Over Old Shingles

If a shingle is.

Re roofing a house over old 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. Remove the ridge caps. How to do it remove caps. Investigate strip shingles entirely and replace roof sheathing as needed.

That s also why building codes commonly limit re roofing to no more than two layers. Install a layer of roofing felt over the roof before you begin installing the new shingles. Step 3 cover the old shingles. Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load.

It can only be done once so if you already have two layers of roofing in place reroofing is not an option for you. Remove air vents and pipe flashings by prying out or unscrewing the fasteners holding the fixture. 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. Damaged decking will need to be repaired before you can install any new shingles.

Use a flat pry bar. Most building codes allow for two layers of asphalt shingles on a house so stripping off everything down to the plywood sheathing may not be your only choice. Find a pre screened local roofing contractor. Doing it now will make it easier to keep the reroofing job clean.

Having said that it will be nearly impossible to get a good looking quality installation. Construction of a new roof deck for asphalt fiberglass roofing if you re going to add a roof on top of an old one it s a good idea to remove any loose shingles and apply a new layer of 30 pound roofing felt before laying the new shingles. In this video we provide details on how to install roof shingles over existing shingles. Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement.

All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. Reroofing is the process of layering one set of new shingles over a set of existing shingles. We discuss the nesting method which helps minimize an uneven appear. 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.

Watch for damaged or un sound roof decking.