wood, even p/t'd, shouldn't be placed in direct contact w/concrete so lay down plastic sheeting w/overlapped & taped seams prior to installing 2x4 gridwork,,, i like 3/4" t & g plywood w/2x4's 12" o/c,,, this removes 'springiness' as you walk on the floor,,, you'll have to rip the 2x4's so their angle matches the slope of the existing floor,,, not an easy task in itself
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