Sagging or low spots in a flat roof may be due to undersized or weakened roof joists or problems with the buildup layers beneath the exposed roofing.
Garage roof sag.
Why roofs sag as mentioned roofs sag because there s too much weight or load for the existing structure.
Sagging rafters can lead to serious problems with the entire roofing system.
This is the easiest problem to repair.
In some cases roof sagging problems are not caused by framing issues.
Use your string line to determine how much the roof need to go up.
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.
If you notice that there is a visible dip in your roof chances are you have a problem with one or several rafters and you may soon be facing more issues like water leaks bowed out walls or your roof caving in on you.
Rotten or saturated sheathing can also cause roof lines to sag.
Follow the simple steps below to effectively repair a garage roof that is sagging.
When rain water comes through your roof s shingles the plywood will wrap rot or weaken and this will make the roof look like it is sagging between its rafters.
A sagging garage roof a leaning garage or a garage in need of straightening can lead to other problems.
If the framing is.
Try to rope in a friend or two as the beams can be heavy and try to plan your renovation project for a sunny weekend.