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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
Vertical wrinkles
Shrinkage of boards
Incorrect spacing between OSB boards
What causes roof shingles to buckle?
- During a certain period of the year we experience a higher humidity. An old roof or its open parts is exposed to this humidity and the wooden planks absorb moisture. As the wood increases in moisture content it can cause movement of the decking.
- When a new roof is installed, moisture is trapped in the system, and the roofing underlayment can absorb moisture and wrinkle.
- After an interior remodeling of the attic, too much moisture can also occur. With the lack of ventilation, wet processes with drywall and plastering might cause the wrinkling of shingles.
- Because homes are built tighter and have higher insulation levels, they may not be properly ventilated. See individual manufacturer’s recommendations for additional ventilation requirements and always check your local build codes regulations.
- Roof sheathing that is not spaced with a minimum of 3 mm can cause buckling due to expansion and contraction.
- Improper installation: failure to apply shingles as directed by the shingle manufacturer’s recommendations.
Pictured: Shingle roof without ventilation
Shingle roof without ventilation
