TopBuild Corp is an installer and distributor of insulation products. Its operating segments are: Installation Services and Specialty Distribution. The Installation Services segment, which generates maximum revenue, installs insulation, commercial roofing, and other building products like glass and windows, rain gutters, doors, etc, mainly in the residential new construction market. The Specialty Distribution segment distributes building and mechanical insulation, insulation accessories, and other building product materials for the residential, commercial, and industrial markets. In addition to insulation and accessories, it distributes rain gutters, closet shelving, roofing materials, and other items. Geographically, the firm mainly operates in the U.S. and, to a lesser extent, in Canada.