Over the course of a structures life it may need several new roofs applied to it. Most homes, buildings and industrial structures can remain standing for a century or more if it is properly maintained. A standard asphalt shingle roof can last anywhere from 10-50 years before it is ready for replacement.
How do you know when your roof is ready for replacement? Firstly knowing the age of your roof and the products used are the first indicator. Secondly having your roof assessed yearly by a trained professional, once the age of the asphalt shingles is over 10 years, is recommended. Lastly it is part of regular maintenance to keep the roof, eaves troughs, down pipes free of debris.
There are several different products available for installation for your sloped roof. Asphalt shingles are the most economical and proven system available for sloped roofs. Over the past decade several new lines of asphalt shingles have been introduced offering warranties ranging from 20-50 years.