Diagnosing other roof problems.
Roof sheathing buckling.
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.
Spacing and significant changes in moisture.
This house dates back to the 60 s with 3 4 1x8 pine decking.
Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content.
Plywood and osb roof sheathing are the most popular roof sheathing materials in the u s.
This sheathing is generally made from plywood or a similar material.
Also h clips reduce any buckling of those edges over time so they are a good idea even if not always required.
Improper installation of roof sheathing panels can result in warping or buckling of asphalt shingles.
This then telegraphs to the shingles above.
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.
If the sheathing is not gapped the sheathing itself may buckle especially with thin sheathing 24 in.
Any ideas what might cause severe buckling of roof sheathing.
But the moisture evaporates as the materials reach equilibrium with the the surrounding air and the shingles settle back down flat.
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.
Visit our blog post why is my roof sheathing sagging between the trusses.
But if your roof surface is sagging between trusses lack of h clips is only one potential culprit.
For a good reason.
If the wood structural panels are tightly butted there is no room for expansion and buckling can occur.
Apa recommends a 1 8 inch space between panel edge and end joints.
If the sheathing is properly gapped then the gaps can close causing the shingles spanning the gap to buckle.
For other possible causes.
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.
Asphalt shingles sometimes buckle slightly and in an irregular pattern due to moisture in a the materials of a new roofing system.
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.
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When plywood or osb sheathing picks up moisture it expands.
That can mean costly time consuming callbacks.
