I live in a townhouse. There is a steel I-beam that run through the basements of all the houses in my row. This I-beam seems to carry a lot of noise. When I'm down in the basement, I can hear the conversations that my neighbors two doors down are having, and my next door neighbor can hear every word of the books on tape I listen to down there. How can I insulate the I-beam so that the sounds don't travel so much? By the way, property values have plummeted in our city lately, so the cheaper I can do this, the better!