Plywood and osb roof sheathing are the most popular roof sheathing materials in the u s.
Roof sheathing buckling.
Apa recommends a 1 8 inch space between panel edge and end joints.
This sheathing is generally made from plywood or a similar material.
That can mean costly time consuming callbacks.
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Diagnosing other roof problems.
If the sheathing is not gapped the sheathing itself may buckle especially with thin sheathing 24 in.
The nails slip out of the sheathing and create small visible bumps on the surface of your roof.
The pieces of sheathing are supposed to be spaced about 1 8 inch apart so that they have room to expand and contract as the temperature changes.
Any ideas what might cause severe buckling of roof sheathing.
The boards dont appear to have come loose at the nails but instead have cuped badly 1 1 2 2 in places.
But the moisture evaporates as the materials reach equilibrium with the the surrounding air and the shingles settle back down flat.
For other possible causes.
Also h clips reduce any buckling of those edges over time so they are a good idea even if not always required.
Buckling can occur if the wrong type of nails were used to connect the sheathing to the rafters.
Spacing and significant changes in moisture.
They are easy to work with readily available and perform the job well.
The wetness gets absorbed by the felt underlayment causing the felt to wrinkle.
Visit our blog post why is my roof sheathing sagging between the trusses.
When plywood or osb sheathing picks up moisture it expands.
This then telegraphs to the shingles above.
For a good reason.
The worst area is over a full bathroom that doesnt have an exhaust fan or window and theres an attic access hole directly outside the bathroom door.
But they must be installed correctly.
But if your roof surface is sagging between trusses lack of h clips is only one potential culprit.
This house dates back to the 60 s with 3 4 1x8 pine decking.
If the wood structural panels are tightly butted there is no room for expansion and buckling can occur.
Under your shingles there is a layer called the roof sheathing.
Improper installation of roof sheathing panels can result in warping or buckling of asphalt shingles.
Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content.
If the sheathing is properly gapped then the gaps can close causing the shingles spanning the gap to buckle.
