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	Roofing Info

CURLING

CAUSES
Curling happens on the corners of shingles, where the ends appear to be bent. They can curl either upwards or under themselves.

Like most roofing problems, curling is do to moisture or an improperly ventilated attic space. However, there are other causes that result in curling as well. Lets discuss them all.

1. High Nails: Curling can occur when the nails that are securing the shingles to the decking are sitting up. Through expansion and contraction of the roof decking nails can inch themselves upward. The way the nailing patterns are set up when installing shingles, this can cause a curling effect on the shingle tabs.
   
   
2. Lack Of Back Coating: Each shingle has a tar line or what some call an adhesive strip. This strip adheres the shingle tabs to the shingle row below it. If shingles are not installed according to manufactures suggestion, this adhesive will not line up properly - and cause the tabs to curl.
   
   
3. Lack Of Ventilation: If a roof is poorly ventilated and in many cases not ventilated at all moisture will build-up in the attic. This lack of ventilation prevents the moisture from exiting the attic space. The moisture will become condensation and begin to cause damage to the homes framing and roof decking. The moisture needs to go somewhere! Slowly and surely it will become trapped between the underlayment and the roofing shingles. This can cause the shingle tabs to curl from the underside.
   
   
4. Improper Nailing: Curling can also happen when a roof is not installed properly. A nailing pattern is designed in a certain way. If an installer deviates from that, many problems can occur. The industry calls it "skip nailing." An example may be that the manufacture recommends four nails per shingle - however, the installer wants to move along faster and takes it upon himself to use only 3 nails per shingle. This causes the shingle to slip downwards, causing a curling effect.

RECOMMENDATIONS
If curling is noticeable then you may have a ventilation problem. Add ventilation to the attic space by adding a ridge vent and making sure you have adequate soffit ventilation an baffles (rafter vents). The minimum requirement is one square foot of net free vent area per 150 square feet of attic floor space if a vapor retarder is not present. If a vapor retarder is present, the amount of required ventilation can be reduced to one square foot of net free vent area per 300 square feet of attic floor space.

Another solution is to simply do an inspection of the singles that are curling. Carefully lift a curling shingle tab and inspect the cause underneath. In many cases a nail may be protruding up that can simply be re-nailed. You may notice that the adhesive strip is damaged or in the wrong place. If so, use roofing cement to adhere the tabs down. If there is moisture and condensation under the tab the you may indeed have a ventilation problem. Usually fixing the ventilation in the attic will allow to curls to sit back down after a few weeks or months.

A better solution is to remove the shingles that are affected. This is done by removing the shingles and inspecting the cause of the curling underneath them. Cut out felt or underlayment that may be causing the curling as well. Then replace the area with new shingles. Depending on the size of the area to be fixed you may elect to replace all the shingles for symmetry and appearance. Make sure to apply shingles in accordance with the shingle manufacturer's recommendations.

For a more permanent solution, re-roof with Owens Corning Shingles. They are specifically designed to withstand North and south Carolina moisture conditions for extended periods of time and are backed by our strongest product warranties* available to homeowners.

For the average homeowner this process can be difficult and dangerous to do on their own. Patton General Contracting* is a certified installer of Owens Corning roof products as well as RoofLock - a product designed to clean and protect your roof from this type of issue. Visit here for more information.

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Other Issues You May Have

As with any type of work you personally do on your home or in this case inspecting your roof, please use caution and safety equipment. If you do not feel comfortable inspecting your roof or you have trouble knowing what exactly to look for, please feel free to contact us for a free consultation.

Visit Here to view home photos using Owens Corning Roofing System.

Feel free to contact us at any of our North and South Carolina locations with any questions or concerns you may have about your roofing needs. We will be happy to assist you in any way we can.