Roof Plywood Buckling

If the adhesive side is not laid properly and not applied flat it will surely show its buckling through the roof shingles.

Roof plywood buckling.

On occasion poor attic ventilation can cause the sheathing to become warped from underneath. However warped plywood sheathing means the entire roof has to be replaced immediately or it may collapse. These ventilating systems work in conjunction with adequate soffit ventilation. For a good reason.

When these boards are not properly fastened and nailed to the framing they can buckle as well. Less likely as a cause of a buckled roof is poor attic ventilation. Plywood and osb roof sheathing are the most popular roof sheathing materials in the u s. 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. That can mean costly time consuming callbacks. But they must be installed correctly. Ripples or waves on the roof surface are a sure sign that the shingles or decking has probably buckled.

Occasionally the buckling is caused by poor workmanship wrong materials or possibly by a problem with the structure itself. Roofs buckle because either the roofing underlayment has wrinkled or the wood deck itself has shifted for some reason. The most common cause appears to be movement in the roof sheathing with changes in moisture levels. 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.

They are easy to work with readily available and perform the job well. Your builder is responsible for providing adequate soffit ventilation. Such buckling may occur between supports or between nails along supports. Apa recommends a 1 8 inch space between panel edge and end joints.

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. Continuous roof vents stationary roof vents turbine vents and power attic ventilators are just a few. If the wood structural panels are tightly butted there is no room for expansion and buckling can occur. Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content.

This happens most often in hot and humid climates.