Fix Sagging Roof Line

Check the ceiling for sagging by attaching a string on one end of the beam and run it along the bottom edge of the beam.

Fix sagging roof line.

Fortunately there are different ways to jack up a sagging roof. The first step is to the basement first. A sagging roof line may original from the ceiling s horizontal rafters. Problems with and repairs to a sagging roof should be evaluated by professionals.

Why is my roof sheathing sagging between the trusses. If the line does not continually follow the bottom of the beam and the bottom of the beam is below the line the beam is sagging. You will need to remove the shingles and the old decking however which means there will be an exposed hole in the roof. Then inspect the metal or plywood gusset plates.

That s how to fix a sagging roof. This gives your roofer a chance to inspect the flashing and roof underlayment for damage. Unfortunately most roof structural defects don t respond well to homeowner fixes and require professional evaluation and repair. Look for any kind of damage including rot cracks breaks and more.

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. Move the jack in increments of one inch to allow for the roof to be able to move with it without cracking. Push up on the plywood until the foam is touching the underside of the roof decking. The easiest way to straighten rafters is to jack them into position.

If the sagging roof is due to rotting or warping roof decking the repair will be much easier. It might be a simple fix that can be done by jacking up loose rafters adding struts or more economically by. Next place your piece of plywood and styrofoam foam side up against the damaged roof decking. However the trick to this process is to do it very slowly so it may take a few weeks before you get the rafter into a position where it is straight again.

If your roof is sagging under the weight of too many shingles ideally all the shingles should be removed and a new set installed. Typically they are lapped and then toe nailed together in its center so that the correct length can be achieved. To learn more about roofs and attics see these other blog posts.