Hello My original floor ( in the grenier) was traditional timber flooring laid on the beams.It was very bouncy so I added a couple of new beams below to reduce the span, and then laid T& G flooring boards directly over the floorboards. This has improved things somewhat but its still very 'springy and I would like a more solid floor. If I were to lay a lightweight concrete screed over this I guess it will simply crack due to the movement? Does anyone have any ideas as to how I can create a good solid floor onto which I could lay tile etc? Hope to hear M