As leaders in building materials innovation, ISI Building Products manufactures cutting-edge vapor barrier, insulation and building wrap brands. The design and ingenuity of these products reflects our mission: to create impactful solutions for building and construction challenges. Building Envelope Solutions With corporate headquarters in East Peoria, IL and manufacturing facilities throughout the Midwest, ISI is a building products manufacturer catering to construction customers throughout North America. Our centralized operations and strategically placed warehousing allow for efficient distribution to locations in the US, Canada and Mexico. Operating since 1997, ISI is proud of the loyalty and level of trust we have earned from respected vendors, distributors, contractors and clients. As a leading building material manufacturer in the USA, we are committed to providing high-performance products for the construction industry and custom, quality solutions for our customers — with the service to back it up.