I have an 80cmX70cm closet in which I need to put a new 250litre hot water tank. The trouble is, the floor (tongue and groove) slopes nearly 3/4inch over the 80cm span (along the floorboards). I would like to build a floor over the floor to level it. I was thinking of laying batons directly over and along the joists and then floorboards. Or is it better given the weight of the tank to shim batons perpindicular to the joists?
Or anyone have a better idea?
Or anyone have a better idea?