Strengthen floor joists

Mackan1935 · 2016-03-03T20:26:05+00:00

I have a floor of 6x4m with joists running lengthwise at cc600, 230x100mm joists. Since I removed a wall about 1.5m from one short side, I find the floor somewhat bouncy. If you jump gently, it sways uncomfortably much, so I want to reinforce the joist. Then the question arises how :) One idea is to screw blocks between the joists, but I don't want to tear up the whole floor. So, it's one row of blocks; the question is whether that helps anything? Then I got another idea, to cut into the joists and lay a steel beam across, anchoring it to the outer joists that have support from the walls below. I have a U-beam 100x40 in the works, and the image below shows how I thought. What do you think?

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Mackan1935

#16

Member · Östergötland

· 127 posts

2 Oct 2017 at 8:37 PM

Mackan1935

Member

Östergötland
127 posts

2 Oct 2017 at 8:37 PM

Found my old thread, thought I'd add more information in case anyone wants to know.

I cross-beamed with 2"3 one row next to the beam (had to remove a few planks too).
Then I screwed and glued two layers of plywood over everything. It turned out okay, but quite a lot of work

Strengthen floor joists

Mackan1935

Mackan1935

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