Insulation.
The sound proof insulation we use is Roxul. If you want a real air tight basement follow the previous instructions then after you finish the vapour barrier strap over it with 2x2 and use shallow elecrical boxes and run the electrical between the studs. That way you don't puncture the vapour barrier and the wiring and outlet boxes are on the warm side of the vapour barrier. If you fill the voids between the floor joists at the plate with packed pink insulation then cut and fit SM flush with the wall and caulk it you will have an almost airtight basement. Then let the HVAC change the air in the house not mother nature. This will give you the best bang for your buck and depending on windows/ doors/ housewrap (Typar) you should be at about 2-5 air changes per hour. Mike Holmes would be hard pressed to do any better. My thinking is... If you have enough money and time to do it twice, You have enough money and time to do it right the first time. For all the people who say it is too much bother and money... remember as the sweetness of less money wears off the bitterness of poor quality remains for ever.
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