Roll Roofing Posted October 18th, 2013 by dmoore2948. Showing all 8 results #43 GAP Organic Base Sheet GAP 55 Smooth Organic GAP 65 Smooth Organic GAP Fiberglass #90 Mineral Surfaced Roll GAP Fiberglass 19″ Selvage Edge GAP Fiberglass Base Sheet G2 GAP Valley Seal Roll Tile Underlayment