Recently moved into a new house and the downstairs flooring is driving me crazy. The noise is unbearable in almost every room. The flooring is constructed as follows. Concrete beam and block base overlaid with 50mm rigid insulation with t&g chipboard top surface. We tried with limited success to replace the hallway floor with traditional t&g planks (110mm). To do this we removed the chipboard and insulation. We then fixed 50x50 timbers to the concrete blocks and refitted the insulation between the wooden beams. Finally we screwed and glued the t&g down to the wooden beams. This dramatically reduced the noise but it’s still not perfect. It seems that due to the block construction the material around the fixing is working loose because the block is crumbling away. We now have the kitchen, living room and reception room to sort out but I am looking for a better solution to the problem. My current thinking is to remove the chipboard and replace it with a concrete slab laid on top of the insulation. The issue is I only have the thickness of the chipboard for my concrete (19mm). I could replace the 50mm insulation with 25mm which would increase my concrete slab to 44mm but I’m not a builder and I don’t know if this would be thick enough. Any advice on what to do would be great.