A1 Roofing Kanga Roof is one of the top-tier Maryland Roofing Companies serving the Columbia, MD, Ellicott City, MD, and Elkridge, MD markets. Our roofers specialize in asphalt architectural shingles for pitched roofs and natural white single-ply PVC membrane for metal and flat roofs. We are a roofing contractor that is proficient at dealing with storm damage, roof repair, and roof replacements as well as installing or upgrading gutters and downspouts.