Adding Floor Joists
Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor.
Adding floor joists. Whether the flexing is the subfloor between the joists or the joists between the beams adding joists at 12 centers will help. 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. After several centuries of service floor joists in older homes may sag or crack. Then set new joists same height as existing ones alongside the old.
Less complicated flooring tasks such as shoring up floor joists or adding bridging to decrease floor deflection may be better suited for a homeowner than taking on a project of this magnitude. Tack a beam under the sagging joists. Set a hydraulic jack and post under the beam and jack up the joists about 18 in. Properly sistering floor joists is very important and should not be rushed to save time.
The best way to approach the problem is to remove all the flooring and floor coverings in the room to be repaired. Learn about different options for adding support to floor joists such as doubling them or using a mid span girder. As incremental parts of a buildings. I was thinking adding a new joist next to it just in case would be a good idea while there was no ceiling but im tempted to leave it for now and then simply replace the whole joist and some of the damaged floor boards when we do the bathroom upstairs next year.
Your timing is excellent. A day until theyre level. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example. Jacking them up too fast may cause cracks in the walls and floors overhead.
This will give you direct access to the floor joists. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. Homes are complex structures and the work of framing out a floor is best left to a professional carpenter or framer. So ive thought about joist replacement for a while.
But larger is not always better when builders are constructing a home or adding a room addition.
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