That they exist now might serve to keep it from getting worse but now that it has been done and re shingled.
Garage roof is sagging.
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.
Sagging roof lines can originate with the horizontal ceiling rafters.
A sagging roof line may original from the ceiling s horizontal rafters.
Follow the simple steps below to effectively repair a garage roof that is sagging.
When the roof framing is assembled two ceiling rafters are often joined together to create a longer span.
Fixing a truss or rafter.
You will need to get up into your attic and examine the roof carefully in order to discover the underlying cause.
Typically they are lapped and then toe nailed together in its center so that the correct length can be achieved.
Also inspect the metal or plywood gusset plates used where your wood meets on a truss look for damage that includes cracks rot breaks and any other impairment.
When the framing of the roof is put together quite frequently two of the ceiling rafters will be fixed together as this will create a much longer span.
A sagging garage roof repair isn t an overwhelming task but it is best to get the job done before it becomes a major roof replacement.
The reason for the sag is probably that there were no rafter ties in the structure to begin with.
Your advisor is facing the right direction but has missed most of the details.