If you want to attach drywall to the ceiling later you ll have to install strips of 3 4 in.
Floor joist softening.
Some newer homes have manufactured i beam shaped joists.
Then set new joists same height as existing ones alongside the old.
A springy or spongy feeling could indicate a minor issue a major problem or.
Then glue and screw the plywood to the joists.
Long sheets are centered on the span leaving the ends of the joists exposed.
Plywood or 1 4 to the undersides of the exposed joist ends.
When installing on the underside of the joists the process is the same.
Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.
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.
Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s.
Tack a beam under the sagging joists.
Properly sistering floor joists is very important and should not be rushed to save time.
The plywood runs parallel to the joists not across them.
A day until they re level.
How to fix springy and spongy floors.
Joists and orient panel ends over joists.
Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.
Add an additional row of fas teners midway between the joists to pull the layers tightly together.