Roof Sagging Between Rafters

Roof sheathing sags for the same reason any component of a home that spans between two bearing points sags.

Roof sagging between rafters.

Grab a flashlight and head up to your attic to inspect your roof rafters and decking specifically those where your roof is sagging. 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. Using 3 8 x 2 lag. Drill four 3 8 holes in the base of the steel angle stock and four holes in the side.

Sagging rafters can lead to serious problems with the entire roofing system. Place the side holes about 1. When sagging gets too severe it can lead to roof collapse and once the roof goes the house won t last for long. Roof sagging in between trusses 1.

The fix here is to replace the thin sheathing with thicker sturdier sheathing. If the roof sags between the rafters or trusses the most likely cause is sheathing that s too thin for the area it covers. Remove any broken splinters of wood that may prevent the rafter or truss member from re aligning itself. Here s some examples of how it can happen.

Sagging rafters are a sign that a house is in serious trouble. Because it was structurally inadequate when installed or has deteriorated over time. Prevent this unfortunate series of events by bracing your rafters to make them sturdy and resistant to snow loads and wind. Sagging sheathing between rafters may be due to rot delamination use of fiberboard or other materials that may not perform well over the life of a home or due use of too thin plywood roof decking to start with.