My wife and I are building a home in Houston, and we are exploring our energy efficiency options. We are interested in icynene, but our builder has not used foam insulation, and has expressed some reservations about moisture buildup behing the icynene. Is this a valid concern in a humid climate such as houston. With foam insulation, what things should we insure to prevent moisture/mold problems. Additionally, what other thing are needed to ensure a fresh air environment for the home since it's now a sealed home?