One of the cheaper materials that you can put on your roof is asphalt shingles. It is both cheap to buy as well as to install. Asphalt roofing is one of the most common types of materials. When installing new shingles you can put them on top of your existing shingles and save some of the work that would be involved removing them.
Your average asphalt shingle roof will last about 20 years, but this span could be shortened by such things as mold and moss. If you find that it is growing on your roof, you should remove it as soon as possible to prevent it from damage your roof. It’s possible to clean it off using a mixture of bleach and water. To keep it from growing in the first place, you should keep moisture from accumulating on the roof. Too much shade could also encourage mold and moss growth.