We are in the planning stages of building a new house, and would like to avoid a problem we now have with our current house. Right now we have a second floor fiberglass tub w/ shower. Whenever someone is taking a shower up there, the noise of the water hitting the floor of the tub travels right through the floor (and ceiling below) to our family room. How do we avoid this problem in our future new construction, bearing in mind that there will be a drain present in the same place as the soundproofing material?