Capstone Materials Group, LLC is the Manufacturer's Representative for GAF Commercial and Siplast in the Chicagoland and Northern Illinois area. As customer-centered specialists in commercial roofing, we are the liaison between our customers and the manufacturers we represent. 

Our current portfolio of products includes TPO, PVC, Modified Bitumen, BUR, Polysio Insulation, as well as liquid applied membranes and reflective roof coatings. To learn more, please contact us at lori@gocapstonematerials.com.