There are many things that can cause buckled shingles. They are more prone to buckle if the roof replacement occurred during summer. This happens because the old roof being removed allows moisture to get absorbed by the wooden deck. With the increased moisture content, it could cause the deck to shift.
Today’s homes usually have tighter building tolerances and more insulation. This means that they are unlikely to have adequate ventilation. Without adequate ventilation, moisture can become trapped in the roofing system, causing the tar paper or felt, also called felt underlayment, to absorb this moisture and wrinkle. To keep this from happening, roofing companies should look into each manufacturer’s recommendations to ensure any additional ventilation is added if it is necessary. Also, buckling can occur if the felt wasn’t stretched and then applied to the roof properly.
If no spacers were used, expansion and contraction in the roof’s decking occur. Spacers can help absorb expansion from the heat when they are put between the decking boards. Also, if the decking isn’t fastened correctly to the framing, or if water leaks under the shingles, it can cause the shingles to buckle in Bloomington, MN. If the decking is continuously exposed to water, it will rot the wood and seriously damage your house.
Anytime new shingles are placed on top of old shingles that are uneven, often called “re-roof” or “roof-over”, it can lead to buckling.
Another reason for buckling could be that the wrong nails were used when connecting the sheathing to the rafters. The nails can slip out of the sheathing, creating small, but visible bumps on the roof’s surface. If the rafter is broken and sagging, it will cause the roof’s surface to dip.
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Roof Buckling Solutions
If wrinkled tar papers are causing the buckling, the fix is an easy one. The wrinkled felt can be cut and reattached so it’s laying flat. Then, new or existing shingles can be placed.
A roof with excess moisture must allow the moisture to leave the roofing system. Once it dries, the buckling should lay flat. Keeping the area dry will keep the buckling from reoccurring.
Vent the attic properly. Each 150 square feet of floor space in the attic should have at least one square foot of vent area that is free. If the vapor barrier has a perm rating less than one, the ventilation area can be reduced to a square foot for every 300 square feet of floor space. It is also important to have half of the ventilation at the roof’s top and the other half at the eaves.
Preventing Roof Buckling
Only use roofing manufacturer approved wood decking material. It should be at a moisture equilibrium with your environment.
All decking materials should be kept dry before, during, and after installation.
Before applying the roofing shingles, use felt underlayment that is asphalt-saturated to cover the decking materials.
When considering ventilation requirements, follow manufacturer’s recommendations. It may be necessary to add exhaust fans so the attic is adequately ventilated and any built-up moisture is removed.
Follow manufacturer’s guidelines when shingles are installed.