Floor Joist Softening

Long sheets are centered on the span leaving the ends of the joists exposed.

Floor joist softening.

The plywood runs parallel to the joists not across them. When installing on the underside of the joists the process is the same. How to fix springy and spongy floors. Plywood or 1 4 to the undersides of the exposed joist ends.

Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home. Add an additional row of fas teners midway between the joists to pull the layers tightly together. Properly sistering floor joists is very important and should not be rushed to save time. A day until they re level.

Tack a beam under the sagging joists. Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s. No one likes the feel of a supposedly solid floor bouncing or sagging underfoot. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.

Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. Since this is a repair of a faulty or damaged floor joist it is imperative to do this project correctly and there are a few big mistakes to avoid. Then set new joists same height as existing ones alongside the old. Choose ring shank nails or screws that are long enough to penetrate the joists by 11 2 in and space them every 6 in.

A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. If you want to attach drywall to the ceiling later you ll have to install strips of 3 4 in. Joists and orient panel ends over joists.