Having a new roof installed on your home is an expensive project. It is normal for a homeowner to want to save money on a roof replacement expense. However, adding another layer of shingles over an existing one is never a good idea. It will only save you a small amount, and could cost you a lot more in the near future.
The highest expense in a roof replacement is the materials that are being used. Labor is the next largest expense. Most of the labor expense comes from the installation process, so you will not save very much in labor by having them not tear off your existing roof.
One problem with leaving the current roofing system in place is the additional weight that will be added when installing a new roofing system on top of it. Asphalt shingles are heavy, your walls and roof structure may have a hard time handling the additional weight of a second layer.
Asphalt shingles are designed to lay flat over a felt underlayment. Shingles are designed to take shape of the surface beneath them. When installed on a smooth surface, the roof will look smooth with even lines. When installing a new layer of shingles over an existing one, your roof will look lumpy and uneven. If you install shingles over a bumpy surface, like your existing shingles, they will not properly adhere. They will be more likely to sustain wind damage, which will lead you to high roof repair costs in the future!
The decking under your shingles should be properly evaluated when you have your roof replaced. Without removing the current shingles this cannot be done, and you will be unaware if there is rotten wood. If you have ever experienced a leak in the past, your decking could have possibly sustained damage.
Alpine Roofing Construction only uses proper installation techniques, and will be make sure that your roof replacement is done correctly. We are a reputable Allen TX roofing company that can handle all of your roofing needs. Give us a call for a free estimate at 972-957-7011!