Perhaps the sheathing is the problem with your sagging roof.
How to fix a sagging shed roof.
Tighten the turnbuckles to bring the walls in and the rafters up.
Add more joists and rafter ties which are also completely absent except for one that is attached way too high to provide much structural benefit.
Remove the broken shingle.
Before you try this method you need to determine whether or not the sheathing that remains is strong.
The amount of time required to repair as shed roof is on a par with building a new one and the cost of materials less than 1 10th.
A shingle ripper is a marvelous tool.
You ve got to get the old nails out that held the damaged shingle in place.
Here s how to fix a shingle on the wood roof of your shed.
With a pair of rafters pushed apart to straighten the sagged roof a new mid span cross tie will be nailed in place.
I prefer the term mid span cross tie to collar tie because i associate collar ties with placement high closer to the ridge.
Grab a flashlight and head up to your attic to inspect your roof rafters and decking specifically those where your.
Also when purchasing a new shed it is worth considering the repair factor 15 years down the line.
If that is the case you need to.
Use a hammer and chisel or flat head screwdriver to break up the shingle.
Fixing a sagging roof by bolstering the beams replacing sheathing.
In most cases a sagging roof is caused either by a broken rafter or roof decking but in some more severe instances a damaged or sinking foundation can be the underlying cause of the problem.
This cost saving is a big plus for any one with basic diy skills and in a similar situation.
Rinse repeat until the sag is gone or at least far less severe.
You will need to get up into your attic and examine the roof carefully in order to discover the underlying cause.