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
- 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
- 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.
- 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
- Spacers not used in between roof deck
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.
- 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.
- 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
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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Other Issues You May Have
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.