Repairing a Built-Up Asphalt Flat Roof - The Spruce- hot sale modified natural asphalt trencher asphalt container ,Repairing a Built-Up Asphalt Flat Roof. By Christophor Jurin Updated 02/06/18. Share Pin Email ... Natural Ventilation for Wood Soffits Home Exterior BasicsHenry 4.75 Gal. 287SF Solar-Flex White Roof Coating (16 ...Henry 287 White Roof Coating both protects your roof from the ... metal, concrete, roll roofing and modified ... 4.75 Gal. Heavy Duty Foundation Asphalt Roof Coating.