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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. Buckling is the result of shingles being distorted due to movement of the roof deck on which they were applied. Bitumen roof shingles have never been proven to buckle by themselves.
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.
For this reason, the installation of shingles to wet wooden boards is not recommended. All wood lumber must be properly conditioned to be at moisture equilibrium. Also remember that the width of boards must always be less than 15 cm!
However vertical wrinkles/buckles can also occur on the shingle roof even when the deck is made from OSB/plywood boards without adequate spacing between boards. The minimum spacing for dilatation is > 3 mm.
Vertical wrinkles
