Wow, am I glad I found Ivan. We had some significant noise issues in our basement apartment and I think we've finally got them under control. Sound control, as I've come to appreciate, is quite a complicated thing to combat. Ivan has both the theoretical background and the practical building know-how to provide good suggestions to solve your sound problems. He also gave a detailed report showing what my reno options were for my specific situation and what kind of sound improvements I could expect from each option.