Garage Roof Trusses Sagging

Usually trusses are put 24 inches apart.

Garage roof trusses sagging.

If you have traditional site built roof framing your storage capacity depends on the design of the framing. However it is important to fix the rafters before doing any other work to the roof. Finally make sure stored items are securely locked in place. Drywall instead of 5 8 in.

Should the bottom cord of one or more trusses be sagging or damaged it may be reflected in a sagging ceiling or if the roof is over loaded to heavy then the downward pressure may cause the sagging. Even ceiling cracks can be caused by damaged trusses or downward pressures. As demonstrated by the dent in my pickup s hood vibrations from the garage door opener can cause items to shimmy around and eventually crash down onto your car or you. So you should start by inspecting the roof from the under side or attic.

You may find that several are in need of straightening and that some of the sheathing must be replaced. The first step is to find out how many rafters are sagging and if anything else is damaged. If your ceiling drywall is sagging between joists sometimes called pillowing it s probably on the top floor and attached to the roof trusses. A sagging roof line may original from the ceiling s horizontal rafters.

One good thing about wood construction is that failures occur slowly and with a crack or split in the wood. Half inch drywall can sag if it s hung under roof trusses that are spaced every 24 in. Typically they are lapped and then toe nailed together in its center so that the correct length can be achieved. When all the trusses are installed and the first row of decking is on this brace is removed.

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. If the framing is sound and problems are not found elsewhere but the roof still sags the problem might have originated because of poor installation of the plywood sheathing or shingles. To hold them up until the decking of the roof is placed on top a 12 foot 1 inch by 4 inch piece of lumber is used. However a bigger problem is nailing the new web member to the ridge peak of the truss and there will be 2 members nailed in this location.

This repair will keep the trusses from sagging. It can be nailed temporarily to each truss as the next truss is put in place. If so i bet the installers used 1 2 in.