I purchased a house built in 1960 and like other people have mentioned the terrible bounce, I got the same exact situation.

I'm thinking of installing blocking to strengthen the floor. The 7 joists are spaced 14½ However, since they're all buckled at the lower part of the joist, ranging from 14⅛ - 14⅞ I wanted to know if it's safe to wedge between 14½ blocks forcing them to move back that extra space. (see below picture)

I also so wanted to know if this load sharing would cause to much weight on other parts of floor beams.

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  • I don't think cross blocking is going to help much the bounce comes from the span the joists are across, sistering would help reduce the bounce. – Ed Beal Dec 17 '18 at 23:22
  • What's your recommendation. Since I was thinking of doing the blocking or screwing in 16 gauged strapping underneath all joists – Joseph Wit Dec 18 '18 at 1:10

I would sister several of the joists, then add solid blocking in each span. The blocking might not be critical, but the ceiling is now open so why not? Solid blocking does not need strapping across the bottom.
Look closely where the joists meet the load-bearing wall at each end. A 2x6 ledger might give extra assurance. Look at the rest of the floor structure for any splits, sags, movement, etc.

  • How does the ledger look – Joseph Wit Dec 18 '18 at 3:09
  • I'm sorry to make you crazy but can you explain your answer in layman's terms – Joseph Wit Dec 18 '18 at 4:07
  • Also I wasn't thinking of putting strapping on the blocks I was saying that I would like to put strapping under the joists – Joseph Wit Dec 18 '18 at 15:22
  • Add a second joist (sister joist) to each original joist. Use glue and nails/screws to effectively double the thickness of each joist. Run each new joist as long as possible, preferably to sit the first end on a load-bearing wall. Place each board with any curve (crown) facing up. You can force the second end up into place with a jack post, and nail it fully to the original. When all joists are done, secure a horizontal 2x6 (ledger) to support all the second ends. If you sister most of the joists, then blocking is optional and strapping is not needed. – John Canon Dec 19 '18 at 4:55
  • What type of floor should I use and Where can I get a jack post – Joseph Wit Dec 19 '18 at 5:00

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