Fix Sagging Roof Between Trusses

Often the framing can be bolstered and beefed up internally but if the roofing material needs replacement anyway it may be best to tear off.

Fix sagging roof between trusses.

The span between trusses exceeds rating of the sheathing each panel of plywood or osb has a grade stamp on one face like the example shown at below with two big numbers near the top. From the inside there doesn t appear to be any water damage or rot. Half inch drywall can sag if it s hung under roof trusses that are spaced every 24 in. If your ceiling drywall is sagging between joists sometimes called pillowing it s probably on the top floor and attached to the roof trusses.

When the roof framing is assembled two ceiling rafters are often joined together to create a longer span. I was thinking about putting additional. The fix here is to replace the thin sheathing with thicker sturdier sheathing. Remedies for a sagging roof there are a number of remedies for traditional rafter style roof frames depending on the problem and its severity.

Driving nails into it might make it worse place the plywood and styrofoam side up against the damaged roof decking. Glue a piece of 1 rigid styrofoam to the plywood. This will give some added strength and take care of any cracks in the wood itself. Drywall instead of 5 8 in.

Measure the damaged area between your roof rafters or trusses. Our roof sags a little between the trusses near the peak on the west facing side of the house. I suspect that the plywood used was cheap quality or too thin. If so i bet the installers used 1 2 in.

If your roof is sagging under the weight of too many shingles ideally all the shingles should be removed and a new set installed. Sagging roof lines can originate with the horizontal ceiling rafters. You can simply have the old sheathing replaced with better material when it s time for new roofing. If a roof dips in between rafters or trusses it s probably because the sheathing is too thin for the span.

The free ends of the expander are bolted below mid span on a pair of sagged opposing rafters. Because driving nails up into the sheathing material will make things worse glue a piece of 1 inch rigid styrofoam to your piece of plywood. Cut a piece of 1 2 inch plywood that will cover the area. The first one is the rated span in inches for roof sheathing the second number is for flooring and the stamp will be visible from inside the attic.

Each side of the iron should be four inches wide with the entire piece being at least two feet long. The expanding roof stretcher used to push out the sag in the roof frame is mounted in place between a rafter pair. If the roof sags between the rafters or trusses the most likely cause is sheathing that s too thin for the area it covers. Drill holes in angle iron to keep the rafter from buckling again you will need to secure it with a piece of 1 2 inch angle iron.