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Why Do Shingles Curl?
When you notice shingles on your home with edges curling up or down, it’s a sure sign that the roof is near the end of its useful life. If you can’t afford to replace the roof just yet, monitor the area for signs of a leak before calling for roofing estimates or installing a new roof yourself. With only a few isolated curling shingles, however, you may be able to delay the inevitable by carrying out temporary repairs.
Curling shingles are a typical roof problem. Once they have curled, they will slowly expose the roof underneath and cause a lot of damage. In some cases, you may need to replace the curled shingled with new ones. If the damages are too extensive, you may need a roof replacement. 
Curling and cupping shingles are an indication that something is wrong with your roof. Cupping occurs when the center of the shingle becomes concave or depressed, so the tile forms a cup. Curling is when the edges raise up. If you notice cupping or curling on your asphalt shingles, you should call a reliable roofing company right away for an inspection.
There are several reasons why your shingles are curling.
Improper Installations
Improper installations of roof shingles are the most common reasons why your shingles have started to curl. They could be the result of installation instructions not being followed. The nails used were not of good quality, the amount used was not enough to hold the shingles securely, or the length was incorrect. In these cases, they will quickly lead to increased susceptibility for the shingles to pull away from the roof. If the nails are not correctly aligned or used in the wrong places, they will also cause damage and result in curling shingles.
Poor Ventilation
Moisture buildup caused by poor ventilation can get trapped between the materials that insulate your roof and attic. That moisture has nowhere else to go but up, causing the buildup to moisten your roof shingles and, through time, will curl them. The humidity can also lead to mold growth and cause many health problems for you and your family.
Wear and Tear Over Time
Shingles are installed with a forty-year or even lifetime warranty, but the wear and tear of time vary. Sometimes, they will need to be replaced before the warranty expires. The roof’s foundation might need repairs before the shingles start to show damage. In this cases, it may be advisable to install a whole new roof entirely.
Materials Used
Sometimes the problems come directly from the materials used in manufacturing the shingles. One of the drawbacks is hiring unregistered contractors that are buying defective materials to make more money. Don’t make wrong choices by cost-cutting that might result in spending double in the long run. If you start with high-grade materials referred by professional contractors, the quality would meet your expectations and cost you less money in the future and even fewer headaches.
New Roof Installed Over the Old One
In some cases, the contractors will not need to remove the old roof to put the new one. If the old roof is sturdy and does not have water damage, a new roof can be installed over the old one. The problems start if the locking together of both tops is not secure and that there was damage from the old roof that was left unnoticed. A layer of old deteriorating shingles can make your new roof look bad. If your existing roof is fairly old, there’s a good chance the shingles are damaged. Shingles that are raised or misshapen make it hard to lay a smooth, flat layer of new shingles on top.
New Shingles Not Sealing Down
Standard asphalt shingles feature an adhesive strip that softens during warm weather, especially when the sun’s rays hit the roof directly. When the shingles heat up, they become flexible and the adhesive bonds the shingles in place. Before new shingles seal down, they can look a little lumpy and uneven, but once the roof gets hot enough, they should soften, flatten and form a permanent seal. Sometimes this problem is more apparent on north-facing roof slopes that don’t heat up sufficiently for the shingles to seal until summer. Usually this isn’t a major issue, but if you live in an area that is very windy, your roofer can apply temporary adhesive to prevent the wind from catching the edge of the unsealed shingles and blowing them off.
An increase in your electricity bills may indicate a crack or opening in your house that allows moisture to build up. These might be the reasons why your ventilation system has been fluctuating. And your heating system seems to be not enough to keep your home warm during the winters. Don’t hesitate to ask for a roof assessment to prevent further damage to your roof. The longer the damages are left unrepaired, the more they will cost, not to mention the further damage within your home.
