Profile: G. A. P. Roofing, Inc. produces asphalt saturated organic felt rolled roofing products for use as underlayments for various types of shingles. We also offer organic & fiberglass slate surfaced and smooth rolled roofing products that are used in valleys and on low sloping areas. Our product line includes organic slate surfaced roofing, selvage edged organic slate, organic base sheet, starter strip and tile as well as shingle underlayment.