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Get to know IKO, the Shingles Expert.
Keeping your roof in good condition is a crucial home maintenance task. Buckled shingles can quickly lead to interior leaks causing damage to your walls and creating the need for major repairs. If this happens, your roof needs to be repaired quickly to prevent further damage and increased repair costs.
What are buckled shingles?
Bitumen roof shingles occasionally show buckles along the length of courses up the roof. First of all it is important to know that buckling is not the failure of shingles.
IMPORTANT!
Bitumen roof shingles have never been proven to buckle by themselves. Buckling is the result of shingles being distorted due to movement of the roof deck on which they were applied.
Roof decks that result in buckling of the overlying shingles are typically made out of lumber (also known as “board” or “plank” decks). Wooden boards or planks shrink or swell depending on their moisture content. Adjacent boards on the deck, even though securely nailed to the roof rafters, can shrink or swell at different rates. Shingles nailed to these wooden decks are usually held in place by two rows of roofing nails, each row often fastened into two separate boards. This is often the case when the board width exceeds the shingle exposure, eg. 20 cm boards vs. 14,3 cm shingle exposure. Differential shrinking/swelling of adjacent roof boards can therefore result in buckling of the overlying shingles. Just put a paper on the table and slide the left and right side 2 mm to the center at the same time. The paper curls and the same can happen with shingles on a lumber deck roof.
