Any ideas on how to fix this.
Fix sagging roof between trusses.
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.
Drywall instead of 5 8 in.
Glue a piece of 1 rigid styrofoam to the plywood.
Cut a piece of 1 2 inch plywood that will cover the area.
Each side of the iron should be four inches wide with the entire piece being at least two feet long.
You can simply have the old sheathing replaced with better material when it s time for new roofing.
Sagging roof lines can originate with the horizontal ceiling rafters.
After measuring the damaged area between your roof trusses or rafters cut a piece of 1 2 plywood that will cover the area.
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.
The free ends of the expander are bolted below mid span on a pair of sagged opposing rafters.
Remedies for a sagging roof there are a number of remedies for traditional rafter style roof frames depending on the problem and its severity.
Half inch drywall can sag if it s hung under roof trusses that are spaced every 24 in.
Measure the damaged area between your roof rafters or trusses.
I suspect that the plywood used was cheap quality or too thin.
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.
I was thinking about putting additional.
Driving nails into it might make it worse place the plywood and styrofoam side up against the damaged roof decking.
If the roof sags between the rafters or trusses the most likely cause is sheathing that s too thin for the area it covers.
From the inside there doesn t appear to be any water damage or rot.
If your roof is sagging under the weight of too many shingles ideally all the shingles should be removed and a new set installed.
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.
This will give some added strength and take care of any cracks in the wood itself.
The expanding roof stretcher used to push out the sag in the roof frame is mounted in place between a rafter pair.
If a roof dips in between rafters or trusses it s probably because the sheathing is too thin for the span.
Multiple layers of shingles and new roofing material that s heavier than the roof was designed for can cause sagging even in a well constructed roof.
If your ceiling drywall is sagging between joists sometimes called pillowing it s probably on the top floor and attached to the roof trusses.
Our roof sags a little between the trusses near the peak on the west facing side of the house.
If so i bet the installers used 1 2 in.
