Installing new asphalt shingles over old
Q. Is it okay to install new asphalt shingle over one layer of shingles?--Marion NC
A. Usually it's okay to install a new layer of asphalt roof shingles over an existing single layer of old shingles, but you should first check your local building codes to see if this type of project meets code acceptability. If your home's roof already has two or more layers of old shingles on it, then it's best to remove all of the old roofing materials and install the new layer of shingles directly onto the roof's sheathing, which should be covered with new roofing felt.
Although it may save you a little time to install the new asphalt shingles over a layer of old ones, there are some potential disadvantages to be aware of. For example, the new shingles may not lay flat on the roof if the underlying shingles are curled or damaged. Also, by not removing the old shingles, you miss the opportunity to inspect your home's roof sheathing for damage and needed repair.
Installing asphalt roofing shingles can be a straightforward home improvement project, but keep in mind that steeply pitched roofs and those with many hips and valleys can be challenging to work on. If you don't have any roofing experience or the proper tools and safety equipment, then you can hire a local roofing contractor to do the work for you.
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Roofing vs. Reroofing
If you come to find out that your roof has been damaged and needs to be fixed then there are two main approaches you can take. You can either decide to make a roof repair or replace the entire roof. Roof repairs will generally save you time and money, but in most cases a new roof is the best option. As a general rule of thumb, if the existing roof on is only one layer and there are no problems with the roof deck, a new roof is not necessary.
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