Putting horse mat stall on a concrete floor serves no purpose (it sort of does, but the purpose is neither acoustic nor the best regarding energy efficiency). Use 1" or thicker Owens Corning Foamular instead. Completely cover the floor and seal the seams and edges. This is the proper way to insulate the floor.Thanks Nicco. I actually just finished the last 3 sheets of drywall this last weekend and spent the rest of the weekend bagging up all the scrap and getting it up to the garage. Glad to be finally done with it! I think after I seal the inner corners up with acoustic sealant I will start to tackle the floor vs. the soffits. For the floor I was thinking of cutting 3 inch strips of 1/2 inch horse mat stall, 12 inches apart wall to wall. Then 3/4 T&G OSB on top, then green glue, then 5/8 OSB the other direction. I'm planning on doing this under the whole floor and then building the riser and stage on top with the thought of keeping as much tactical vibration as possible but insulating from the concrete slab. In doing that however, I'm not sure about putting sand in the stage due to the weight on the floating floor. What are peoples thoughts on this?