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You can see from the picture on your right that buckling is looks like something is underneath the shingles on your home. However, shingles can actually buckle (rise) up themselves without anything actually pushing them up from underneath.

There can be many causes for buckling on a roof. Lets discuss a few.

  1. Improperly applied felt: Buckling can occur when the vapor barrier know as felt (or commonly referred to as tar paper) is installed wrong. Felt can rise and buckle if it's not stretched and applied to your roof decking (plywood) properly. Naturally, being that your shingles are installed "over," the felt, it causes the shingles to buckle as well.

  2. Wrinkled underlayment: Similar to felt, an underlaynment is a vapor barrier. Underlayment such as Owens Corning WeatherWatch is used around areas that are more susceptible to moisture. Most underlayments have an adhesive side and a barrier side. If the adhesive side is not laid properly and not applied flat, it will surely show its buckling through the roof shingles.

  3. Roof deck movement: Your roof decking is the plywood sheets that cover your home. When these boards are not properly fastened and nailed to the framing they can buckle as well. Deck movement will also occur when a leak has found its way under the roof shingles. This causes the decking to warp and eventually rot, causing serious damage to your home.

  4. Spacers not used in between roof deck boards: Proper installation of roof decking requires spacers that are installed between the wood to keep them from swelling and buckling. These spacers are commonly known as plywood clips. When two separate pieces of plywood are butted together - and one or both swell - there is no room for the board to move. This action causes buckling that can be seen through the roof shingles.

  5. Poor roof 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 will cause the roofing shingles to warp and buckle from the underside.

  6. New shingles applied over old, rough shingles: Applying a new roof over existing shingles is never recommended in the Carolina's. If a roofer suggest a roof-over or re-roof - run for the hills. Moisture and buckling will happen 100% of the time... it's not a matter of if... it's when!

You can allow moisture to simply escape the Roofing System. However, this can be a slow process and could take until the following spring. Once the Roofing System reaches the proper moisture content, the roof should lay flat and the buckling problem should not return until the following year.

A better solution is to remove the shingles that are affected. This is done by removing the shingles and inspecting the cause of the buck underneath them. Cut out plywood, felt or underlayment that is causing the buckle. 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.

If buckling is occurring then it's safe to say that the attic space is not properly ventilated. 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.

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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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.




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