When an asphalt-shingle roof is 20 or 30 years old and the shingles start curling up at the edges, this is par for the course. The shingles are probably nearing the end of their serviceable life and need to be replaced. But when your roof is rather new and the shingles start curling, that's a whole other story. Curling shingles won't adequately do their job of keeping moisture and cold out of your home. So, you'll need to have them replaced. What's more important, however, is figuring out why they are curling so your replacement shingles don't suffer the same fate.
Give the company that installed your roof a call and let them know that the shingles are curling. They may be getting calls from other homeowners complaining of the same problem with the same shingles, and this could indicate that the batch of shingles was not made properly. Most shingles come with warranty, and the company may replace them free of charge if you're within the warranty period. Even if there is no warranty, if the roofing company can attest to the fact that the shingles were faulty, the manufacturer will often agree to replace them rather than have a disgruntled customer.
Another possibility is that your attic is poorly ventilated. When this is the case, heat builds up in the attic, warming the roof and causing premature shingle deterioration. Does your attic feel stuffy and humid when you open it? Have you noticed that your insulation is starting to compact or mold? These are all signs of poor ventilation. Your roofing company can improve your ventilation by installing additional soffit vents or an attic fan, which will not only protect your future shingles but also lower your energy bills!
Installation Over a Previous Roof
In order to save money, some homeowners will have a new roof placed directly over an old one without first removing the old shingles. While this is an efficient way to install a roof, it is not the best for the shingles. If there is any moisture trapped between the layers, it can cause the shingles to start curling. Plus, the wind has an easier time working its way between the two layers and peeling the top shingles up.
You should be able to tell whether your roof was installed on top of an old one just by looking at the edge of the roof. To prevent this problem from happening again, you'll want to have both roofs stripped off before your new shingles are installed.
Visit sites such as http://www.stevensroofingcorp.com to find roofing companies near you.