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Shingle roof without ventilation
How to solve buckled shingles?
- Allow moisture to escape the roofing system. Once the roofing system reaches the proper moisture content the roof should lay flat and the buckling problem should not return.
- Remove the affected shingles. If the underlayment is wrinkled, repair the wrinkles by cutting and re-nailing the underlay so that itis flat and replace the shingles. Help with Shingle Stick if necessary.
- Ensure that the roof attic is properly vented. For a standard sloped roof up to 40 degrees the minimum requirements are 1 m² of the Net Free Area/NFA per 300 m² of insulated ceiling area located under the roof, always divided evenly between the eaves (for air intake) and the ridge (for air exhaust). If you have good vapor barriers in the house, you can reduce the NFA (Net Free Area) about 40%, but always follow local building regulations.
>>> BLOG TIP: A more detailed explanation about roof and attic ventilation.
How can I prevent buckled shingles?
- Use only wood decking materials approved by the roofing manufacturer. These materials must be properly conditioned to be at moisture equilibrium with the job site environment.
- Do not expose decking materials to water before or after application.
- Cover wood deck materials with an approved IKO Armourbase underlayment and then apply shingles.
- Ensure adequate attic ventilation. See individual manufacturer’s recommendations for additional ventilation requirements.
- Apply shingles in accordance with IKO shingle manufacturers’ recommendations.
Wood will expand when it gets wet. Even increases in the moisture conditions around the decking lumber can cause expansion. The tendency of this expansion will cause buckling of shingles on the roof. If possible, always allow the decking material to acclimatize to the conditions where they are being installed.
>>> BLOG TIP: Learn more on how to ensure a stable roof deck.
Some additional tips:
- For the best result use OSB boards in tongue and groove. Then it is not necessary to foresee a 3 mm spacing between the boards because the dilatation gap is in the lock.
- It is always better to cover old wooden boards sheathing with a new layer of thin OSB boards.
- If you are forced to apply wooden boards for decking, try to use boards with shiplap or tongue & groove joints.
- Always use a proper fastener for decking: use long enough nails with ringed or twisted shank.
- The best option for the fastening of shingles is IKO barbed roofing nails or coiled roofing nails when using a nail gun.
- The fastest way to repair an unventilated roof is to install Armourvent Multi ridge ventilation.
Pictured: Tongue & groove joint (left) - Shiplap joint (right)
Tongue & groove joint
Shiplap joint
Tongue & groove joint
Shiplap joint
