Use your string line to determine how much the roof need to go up.
How to fix a sagging garage roof ridge.
If your rafters are still sagging a bit and it is causing your roof to dish out a little in the center of the roof sides add a 2x4 that goes all the way across the rafters in the center of the length of the rafters.
In many cases you ll need to fix sagging trusses or rafters to repair your roof.
Fixing a sagging roof as soon as you spot it is very important otherwise you could find that the problem will only worsen over time and in the end you may need to have the entire roof replaced which could be extremely costly not to mention a lot of hassle.
Solutions can range from simple to downright ugly for your wallet and unless you re comfortable with span tables advanced carpentry and working at heights fixing a sagging roof is almost always time to call a pro.
Push up on the plywood until the foam is touching the underside of the roof decking.
Not enough structural support for the load.
If that s what you re dealing with regarding your home take these steps to ensure your rafter or truss gets fixed properly.
That s how to fix a sagging roof.
In some cases roof sagging problems are not caused by framing issues.
The cause of a sagging roof is straightforward in theory.
If you have just stepped outside your house and realized that your roof is no longer straight this could signal a problem.
You ll need a steel l channel to get your rafter or truss back into shape.
How to fix sagging roof trusses or rafters.
After that use a piece of lumbar strapping to keep the plywood in place until you can get a roofing repair expert to fix it.
Next place your piece of plywood and styrofoam foam side up against the damaged roof decking.
This is the easiest problem to repair.