Also h clips reduce any buckling of those edges over time so they are a good idea even if not always required.
Roof sheathing buckling.
This house dates back to the 60 s with 3 4 1x8 pine decking.
This then telegraphs to the shingles above.
But if your roof surface is sagging between trusses lack of h clips is only one potential culprit.
The wetness gets absorbed by the felt underlayment causing the felt to wrinkle.
The boards dont appear to have come loose at the nails but instead have cuped badly 1 1 2 2 in places.
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Asphalt shingles sometimes buckle slightly and in an irregular pattern due to moisture in a the materials of a new roofing system.
If the sheathing is not gapped the sheathing itself may buckle especially with thin sheathing 24 in.
Visit our blog post why is my roof sheathing sagging between the trusses.
Spacing and significant changes in moisture.
For other possible causes.
This sheathing is generally made from plywood or a similar material.
For a good reason.
They are easy to work with readily available and perform the job well.
Diagnosing other roof problems.
But the moisture evaporates as the materials reach equilibrium with the the surrounding air and the shingles settle back down flat.
Plywood and osb roof sheathing are the most popular roof sheathing materials in the u s.
But they must be installed correctly.
Any ideas what might cause severe buckling of roof sheathing.
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.
Apa recommends a 1 8 inch space between panel edge and end joints.
Buckling shingles can sometimes be traced back to mistakes made during roof installation even though the buckling may not show up for a year or two after you get a new roof.
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.
When plywood or osb sheathing picks up moisture it expands.
Buckling can occur if the wrong type of nails were used to connect the sheathing to the rafters.
A broken sagging rafter will also cause a dip in the roof s surface.
That can mean costly time consuming callbacks.
If the sheathing is properly gapped then the gaps can close causing the shingles spanning the gap to buckle.
