Roof Plywood Buckling

Occasionally the buckling is caused by poor workmanship wrong materials or possibly by a problem with the structure itself.

Roof plywood buckling.

For a good reason. Ripples or waves on the roof surface are a sure sign that the shingles or decking has probably buckled. Roofs buckle because either the roofing underlayment has wrinkled or the wood deck itself has shifted for some reason. Buckling of wood structural panel sheathing such as plywood or oriented strand board osb occasionally results when increased moisture conditions cause the wood to expand.

Your builder is responsible for providing adequate soffit ventilation. When plywood or osb sheathing picks up moisture it expands. Call your builder and have him fix the buckled plywood. But they must be installed correctly.

These ventilating systems work in conjunction with adequate soffit ventilation. Your roof decking is the plywood sheets that cover your home. If the sheathing is properly gapped then the gaps can close causing the shingles spanning the gap to buckle. The most common cause appears to be movement in the roof sheathing with changes in moisture levels.

Plywood and osb roof sheathing are the most popular roof sheathing materials in the u s. Less likely as a cause of a buckled roof is poor attic ventilation. When these boards are not properly fastened and nailed to the framing they can buckle as well. Such buckling may occur between supports or between nails along supports.

That can mean costly time consuming callbacks. Continuous roof vents stationary roof vents turbine vents and power attic ventilators are just a few. If the adhesive side is not laid properly and not applied flat it will surely show its buckling through the roof shingles. They are easy to work with readily available and perform the job well.

Apa recommends a 1 8 inch space between panel edge and end joints. However warped plywood sheathing means the entire roof has to be replaced immediately or it may collapse. Improper installation of roof sheathing panels can result in warping or buckling of asphalt shingles. However a more pronounced buckling in a line running up the roof like in the photo above is caused by buckling of the edges of the plywood or osb roof sheathing due to water intrusion or extremely high humidity in the attic.

Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content.