I have a problem with water under the garage floor. The floor is concrete and always cold. the walls are lined and the problem was not noticeable when I had a floating floor which I removed when the garage flooded recently. I suspect that part of defence against moisture was the foil topped underlay. Can I put a similar underlay under a hybrid floor? The hybrid I have chosen has its own underlay and so underlay is not normally required but I am inclined to use it. Should that present any problems?