Hi everyone, I'm after some advice and thoughts please. I'm turning a large subvoid under my house into a games room / storage. I've taken a number of walls out (and replaced with steel) that supported the ground floor that is made of 4x2 timber joists at approx 400mm centres. Largest area has a span of 3.5 to 4m, with one end in a wall pocket and then supposted by two steels, mid and othr end. No noggins what so ever are located within the floor make-up. The floor is wedged up well on the steels and I've screwed the floorboards down into the joists. Ive still got some bounce / wobble on the floor in the largest area where the kids play. I was firstly going to just put noggins in, but from researching I'm not sure if this will reduce the bounce to what I want. Now I'm thinking of sistering each joist with the same size C24 4x2, coach bolting and glueing together. I don't intend to make the wall pocket larger at one end, so the new joist will be bolted straight on to the old. I will be abe to get the majority of the length in for each sister. I don't want to increase the joist depth because I'm already very tight on headroom. My question is, would this sistering approach work to reduce the bounce? Any thoughts greatly appreciated. Many thanks, Stu.