Drums on a raised wood floor?

Hi, I have my drum kit in a concrete shed in my back garden, which is made of four double concrete walls on a six-foot deep concrete base. It's quite good at keeping the sound of the drums from annoying my neighbors at the moment. I plan on putting in a raised wood floor in January (it's just carpets on concrete right now) and I was wondering: Would this reduce sound isolation to the outside? Would it have a negative effect on the sound of my drums in the room? Any suggestions on methods of building raised wood floors also greatly appreciated :mrgreen:

You have a garden shed with double wythe concrete walls? Follow the sticky at the top of the forums, and this forum. Andre