I have a house from the '70s with aerated concrete blocks in the walls on the ground floor and intermediate floors, while the upper floor has a wooden frame. I'm now renovating the kitchen and have discovered that the intermediate floor on which the kitchen stands has cracked. It's constructed of Siporex (or similar lightweight concrete) 600 wide, 200 thick, spanning 3.1m. Some of the most cracked blocks have dipped a couple of centimeters in the middle and can be pushed up with hand pressure from the ground floor, so it's not suitable for setting a new kitchen on. My idea is to replace the lightweight concrete with a traditional wooden frame. To meet deflection requirements, I'm thinking of using 2x 45x170 c/c600, 7mm ply screwed and glued from below, and 22mm screwed and glued particleboard on top. I would have liked to use 45x220 beams but cannot exceed 200mm in total for the frame.
Has anyone done anything similar? Any opinions?
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