Actuate the intensity of damage.
Raising sagging roof rafters.
How to straighten sagging roof rafters.
Push up on the plywood until the foam is touching the roof decking s underside.
If there is any other damage it should also be fixed before moving to the next step.
Place the plywood and styrofoam side up against the damaged roof decking.
The first and foremost step is to find out how many and from where the rafters are sagging.
So you should start by inspecting the roof from the under side or attic.
Sagging rafters may be the result of having framed the roof with lumber of dimensions smaller than current building standards such as using 2x4s or 2x6 s or there may be damage to the framing from insects or rot.
Determine the extent of damage.
Spread polyurethane glue into the crack with a stiff bristle brush.
If the damage is identified then it will be easy to repair it.
You may find that.
The first step is to find out how many rafters are sagging and if anything else is damaged.
Drill holes in angle iron.
Keep the plywood in place using a piece of lumbar strapping until you can get a roofing expert to repair it.