When the damage occurs on only one side of the roof the ridge will drop and move sideways as shown below.
How to fix a sagging shed roof ridge.
Drill four holes in each side of the l.
How to fix sagging roof trusses or rafters.
I prefer the term mid span cross tie to collar tie because i associate collar ties with placement high closer to the ridge.
Now add collar ties from one side of the rafter to the other.
Another cause of ridge deflection is impact damage to rafters.
How to straighten sagging roof rafters.
Here s how to fix a shingle on the wood roof of your shed.
Use a hammer and chisel or flat head screwdriver to break up the shingle.
You may find that.
Remove the broken shingle.
Fixing a sagging roof by bolstering the beams replacing sheathing.
Starting at the end that s the most difficult to.
If that is the case you need to.
The first photo below shows a roof with an area of ridge deflection viewed from the side that is barely noticeable followed by the same area sighted down the ridge line.
Rinse repeat until the sag is gone or at least far less severe.
Carefully pull out the broken pieces of the shingle.
Before you try this method you need to determine whether or not the sheathing that remains is strong.
With a pair of rafters pushed apart to straighten the sagged roof a new mid span cross tie will be nailed in place.
Determine the extent of damage.
Perhaps the sheathing is the problem with your sagging roof.
Drill holes in angle iron.
First perform step 2 except keep the string under your beam and off to the side a bit to make room for some framing.
Once you have established how much the roof sag needs to be jacked up lay a 2x4 plate across the ceiling joists and nail directly under the ridge of the roof.
You ll need a steel l channel to get your rafter or truss back into shape.
In small increments jack the ridge tighten the turnbuckles to bring the walls in and the rafters up.