Cottonwood Building Materials Manufacturers 475 E 4th St N Welcome to Extreme Panel. Here you will find detailed information on our product, Structural Insulated Panels or, SIPs. SIPs are used to build an extremely efficient house that will provide low heating and cooling costs all year round. Cottonwood MN Building Materials Manufacturers Extreme Panel Technologies www.extremepanel.com Extreme Panel SIPs Structural Insulated Panels building custom manufactured walls roofs floors commercial buildings residential homes construction Extreme Panel SIPs Structural Insulated Panels building custom manufactured walls roofs floors commercial buildings residential homes construction Business Reviews Extreme Panel Technologies Testimonials