Roof Sheathing Buckling

Plywood and osb roof sheathing are the most popular roof sheathing materials in the u s.

Roof sheathing buckling.

If the sheathing is properly gapped then the gaps can close causing the shingles spanning the gap to buckle. The nails slip out of the sheathing and create small visible bumps on the surface of your roof. 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 if your roof surface is sagging between trusses lack of h clips is only one potential culprit.

Apa recommends a 1 8 inch space between panel edge and end joints. Plywood and oriented strand board osb like all wood products will expand or shrink slightly with changes in moisture content. This sheathing is generally made from plywood or a similar material. Spacing and significant changes in moisture.

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. 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. For a good reason. Any ideas what might cause severe buckling of roof sheathing.

Also h clips reduce any buckling of those edges over time so they are a good idea even if not always required. A broken sagging rafter will also cause a dip in the roof s surface. When plywood or osb sheathing picks up moisture it expands. Diagnosing other roof problems.

If the sheathing is not gapped the sheathing itself may buckle especially with thin sheathing 24 in. This house dates back to the 60 s with 3 4 1x8 pine decking. The wetness gets absorbed by the felt underlayment causing the felt to wrinkle. Under your shingles there is a layer called the roof sheathing.

Tools you will need for roofing from amazon bostitch coil nailer https amzn to 2u1v8e2 shingle remover https amzn to 2fzu5wf roof snake https amzn to 2. For other possible causes. Asphalt shingles sometimes buckle slightly and in an irregular pattern due to moisture in a the materials of a new roofing system. But they must be installed correctly.

Buckling can occur if the wrong type of nails were used to connect the sheathing to the rafters. They are easy to work with readily available and perform the job well. Improper installation of roof sheathing panels can result in warping or buckling of asphalt shingles. If the wood structural panels are tightly butted there is no room for expansion and buckling can occur.

Visit our blog post why is my roof sheathing sagging between the trusses. The boards dont appear to have come loose at the nails but instead have cuped badly 1 1 2 2 in places.