Sagging Ceiling Joists

If you have a ceiling light fixture you have to move its electrical box down when you hang a second layer of drywall.

Sagging ceiling joists. Since this isn t a floor then the allowable deflection tables don t really apply adds jigs n fixtures. If so i bet the installers used 1 2 in. Drywall instead of 5 8 in.

How do i correct sagging ceiling beams joists. The sag could be reduced or eliminated by installing king posts or leom could sister 2x8s to the 2 6 joists to roughly triple the load bearing capacity of the ceiling. If your ceiling drywall is sagging between joists sometimes called pillowing it s probably on the top floor and attached to the roof trusses.

Jack up the ceiling with the bottle jack. He used specialty clips to attach the lath back to the joists. Spacing of ceiling joist or trusses if the ceiling joists or trusses supporting the ceiling drywall is spaced too far apart then sagging may result and the stress from this may create cracks.

Install a strongback across the top of the ceiling joist. Hopefully this will be helpful to anyone that needs to replace some joists. A general contractor sistered new joists to the existing ones.

This exposed a gap over the scribed beam which had been cut away to follow the sag. Half inch drywall can sag if it s hung under roof trusses that are spaced every 24 in. Nail the strongback to the joist that are flat and add a 2x4 block to tie the vertical 2x6 to the ceiling joist.

Instead of buckling the boards we scabbed them which consists of running two lengths of board end to end and then attaching them with a shorter piece in the middle scabbing over the seam. A rather simple method of jacking up ceiling joists to take sag out and putting in support lumber. He was able to raise the sagged ceiling two inches of the total three inches the ceiling bowed at center.