Great Northern Insulation services in Ontario include spray foam insulation, insulation removal, ba.t attic insulation, energy audits rebate guides..Blown in insulation is one of the most common ways to insulate the attic, crawle or walls of a home. The average cost is about $,, with most homeowners .The cost to Insulate an Attic starts at $. $. per square foot, but varies significantly with common options. Get real costs for your SPECIFIC project .Brief history of Zonolite and the zonolite attic insulation trust. Zonolite Insulation is the trademarked name of a product mined in Libby, MT and sold as attic .