Have you recently had a new shingle roof installed on your home? Have you noticed that some of the shingles are already distorted or buckling? If so, read on for 4 reasons why this might be happening.
There Were No Spaces Left Between The Plywood Sheathing
It can be expected that at least a little moisture will make its way underneath your home's shingles. In fact, according to The Engineered Wood Association, there should be an eighth of an inch space between each plywood sheathing edge to accommodate moisture, and any experienced roofing contractor will make sure that those spaces are there.
The spaces allow the plywood sheathing boards to expand and contract without butting up against each other and pushing each other upwards.
If you didn't hire an experienced contractor to install your roof, though, and they didn't leave those necessary spaces between the plywood sheathing, then the plywood has nowhere to go when it expands but up, thus causing the shingles to buckle above them.
The Plywood Sheathing Wasn't Fastened Properly
Not only does the plywood used to cover your roof have to have spacing in between it -- it also has to be fastened securely to the frame of your home. If whoever installed your roof missed the frame a few times when they drove their nails through the plywood sheathing, the sheathing is not securely attached to your house. When this happens, the plywood can shift too far one way or the other and butt up against a bordering piece of sheathing.
The result is the same buckling you would see if there weren't any spaces left between the sheathing, but as only a portion of your roof will be affected, the damage will be less severe.
The Roofing Felt Was Left Exposed Overnight
Your roof has a layer of felt between the plywood sheathing and the shingles. The felt is intended to protect the shingles from the rough, sometimes sappy wood. This felt underlayment isn't waterproof. The shingles will protect it from any damaging rain or condensation, unless, of course, the shingles aren't covering the felt when the roof is exposed to moisture.
Your roofer should have only stretched out and installed the amount of felt underlayment they could cover by nightfall. If they rolled out the felt one day and did not cover it with shingles until the next day, then the felt could have been saturated with morning dew.
When roofing felt becomes excessively wet, it wrinkles up, thus pushing up and buckling the shingles on top of it.
There Isn't Enough Ventilation In Your Attic
This problem is common on roofs that were installed in colder climates. The heat from your house rises to your attic. From there, it should be vented out of your house. If you don't have proper ventilation in your attic, though, that warm air will build up below your roof's sheathing. If your roof is cold, the warm air will create condensation in your sheathing.
This condensation will cause your sheathing to swell, thus pushing the boards together and pushing up the shingles on top of the boards. The problem can be minimized by making sure your roof stays snow-free, but only adding more ventilation to your attic will remedy the problem in its entirety.
If your roof is relatively new and you're already seeing signs of warped or buckling shingles, the problem likely stems from lack of attic ventilation or improper roof installation techniques. Contact a roofing contractor like Acoma Roofing to find out how to remedy the problem you're experiencing and to learn how to prevent it from happening in the future.Share
2 September 2015
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