A floor that bounces as you walk across it may just need to be stiffened with bridging which spreads the load on each joist to adjoining joists strengthening the whole floor.
Adding cross bracing to floor joists.
By the diy experts of the family handyman magazine nail bridging on all joists.
If it is wood it is nailed to the upper top of the side of the floor joist before the floor or sub floor is installed on the joists.
Because of this x shape one brace will be forced upon and under tension while the other brace will be compressed.
Even if your joists already have a row of bridging at the center of the span adding a row on each side of the existing bridging will stiffen the floor.
As a footstep falls on one joist some of the force is transferred to neighboring joists.
Residential building code requires the use of cross bracing or blocking for floor joists exceeding 2 inches by 12 inches but many homes especially older ones have creaky uneven floors because.
Bridging or x bracing allows joists to share weight.
However there are actually two types of floor joist bracing commonly used.
Place the lumber block between the two joists.
The difference is that the cross bracing uses two pieces of support in a diagonal shape that creates an x between the joists instead of a solid block in blocking.
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Cross bracing and solid blocking.
This can allow for floors to be sturdier and more stable.
Nail the block in place with 16d.
Bracing will stiffen a floor system prevent floor joists from twisting and increase overall stability.