For a good reason.
Roof plywood buckling.
When these boards are not properly fastened and nailed to the framing they can buckle as well.
Roofs buckle because either the roofing underlayment has wrinkled or the wood deck itself has shifted for some reason.
Plywood and osb roof sheathing are the most popular roof sheathing materials in the u s.
They are easy to work with readily available and perform the job well.
If the sheathing is properly gapped then the gaps can close causing the shingles spanning the gap to buckle.
Improper installation of roof sheathing panels can result in warping or buckling of asphalt shingles.
Occasionally the buckling is caused by poor workmanship wrong materials or possibly by a problem with the structure itself.
However warped plywood sheathing means the entire roof has to be replaced immediately or it may collapse.
That can mean costly time consuming callbacks.
On occasion poor attic ventilation can cause the sheathing to become warped from underneath.
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.
This happens most often in hot and humid climates.
When plywood or osb sheathing picks up moisture it expands.
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.
These ventilating systems work in conjunction with adequate soffit ventilation.
Apa recommends a 1 8 inch space between panel edge and end joints.
Your roof decking is the plywood sheets that cover your home.
If the adhesive side is not laid properly and not applied flat it will surely show its buckling through the roof shingles.
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.
Continuous roof vents stationary roof vents turbine vents and power attic ventilators are just a few.
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.
Call your builder and have him fix the buckled plywood.
