DWM is a certified CertainTeed Shingle Master. This distinction ensures that you are getting the most qualified roofing contractor in the business! DWM Roofing serves all of Howard County, MD, and this home can be found in 21797. This roof was replaced with CertainTeed Landmark PRO, in Max Def Weathered Wood. CertainTeed offers a wise variety of shingle colors, which you can view in the Inspiration Gallery.