Slippery Rock Commercial Roofing Contractors has been re-roofing buildings since 1985, and it easily makes up most of our job portfolio. Re-roofs are a niche in the market due to the knowledge needed to remove the existing roof. The roofer needs to consider how long it will take to tear off the roof to properly budget time for the job. We have all equipment necessary to remove your roof from the deck and install the new roof while keeping water out of the building.