Open Cell Foam In Crawl Space
I am getting ready to start my build on a new 2400 square foor home on a 4' crawl space and plan on using foam insulation in the home. I have spoken to 2 different foam companies and each is very reputable and been in the foam business a lng time but have 2 different recommendations.
Foam #1 recommends mainly closed cell application and #2 recommends all open cell. I have researched this forum and others and understand that some have concerns that insulating the roof "lid" wth closed cell might hide roof leakage and there are some concens with open cell insulation also but the above grade/roof structure isn't my biggest area of concern.
I am getting 2 very different opinions on the crawl space application. #1 recommends closed cell insulation on the exterior concrete wall/rim joist (no wall vents) and a floor liner and a conditioned crawl space and #2 recommends open cell on the floor joists/underside of plywood subfloor/rim only and a conventional crawl space with vents/no wall insulation but a poly liner on the crawl space (dirt) floor.
#2 has been in the spray foam only business for over 15 yeas and are quite large but this technique goes agains 99% of what I have read on the net. Opinions????