Royalty Free Photography

Modern roof underlayments are made of synthetic layers, which can include insulation. The asphalt coated builders felt of olden days has been replaced with polypropylene, polyester, or fiberglass fabric. Here, a long strip of rolled underlayment has been applied to a new plywood deck on a residential new shingle roof project in Alexandria, VA, Arlandria – Del Ray neighborhood. Photo by Ned Overton