At the end of the day, insulating the basement is about improving energy efficiency. For this, SFI has proven to be the best, and for performance, nothing compares. SFI provides a totally airtight space. It installs higher R-Values than any product. And it doesn’t allow moisture to collect. At the same time, SFI is considered to be a premium product, and may not fit every budget. For another option, Great Northern Insulation now offers a viable alternative - the “hybrid” application.