Alcon’s Roofing Inc.- Fresno Clovis Ca. Roof Contractor – Alcon’s Roofing Inc. has over 24 years experience roofing the Valley. We have extensive experience in all phases of commercial and residential roofing. We install custom composition shingles such as Malarkey, GAF, Certainteed, and Owens Corning. We also install Certainteed’s Presidential, GAF’s Grand Sequoia and Malarkey’s Windsor. We also install built up systems and single ply roofing for patios and large commercial applications.