Doubling up polyiso inexpensively, and other crawl space questions

Trying to encapsulate and insulate my uninsulated crawl space at 9,000 feet in northern Colorado. Got the house last January and amazingly the pipes didn’t freeze last winter at -20,… Trying to encapsulate and insulate my uninsulated crawl space at 9,000 feet in northern Colorado. Got the house last January and amazingly the pipes didn’t freeze last winter at -20,…Read MoreGreenBuildingAdvisor