Driving nails into it might make it worse place the plywood and styrofoam side up against the damaged roof decking.
Fixing uneven roof trusses.
After measuring the damaged area between your roof trusses or rafters cut a piece of 1 2 plywood that will cover the area.
These trusses are usually engineered by a structural engineering company to carry a specific roof load.
The expanding roof stretcher used to push out the sag in the roof frame is mounted in place between a rafter pair.
When a truss becomes damaged cut or modified there is a chance of a structural overload or that they will not perform properly.
One of the most common causes of roof issues are problems related to the rafters or trusses.
Each side of the iron should be four inches wide with the entire piece being at least two feet long.
They have issues for a wide variety of reason including damage from wind storms overloading from ice and snow leaks etc.
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.
By dropping the top chord of a hip truss a framer can can install lay in gable trusses which sit flush with the top chord of the trusses on the opposite side of the hip giving framers an even surface to sheath.
Cut two pieces of lumber 4 feet long for the first phase of the repair.
If a lot of trusses are damaged or one has been significantly modified or cut then consulting a engineer is wise.
Cut each piece of sheathing.
These will serve as patches to be installed on each side of the broken roof truss.
This will give some added strength and take care of any cracks in the wood itself.
Therefore giving them a good look is critical when addressing sagging bowed or wavy roofs.
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.
Cut a piece of 1 2 inch plywood that will cover the area.
Glue a piece of 1 rigid styrofoam to the plywood.
Measure the damaged area between your roof rafters or trusses.