The commercial built-up roof system, or asphalt flat roofing, consists of multiple plies of roof felts laminated with bitumen (typically asphalt). The asphalt or coal tar is heated in a kettle or tanker and then applied by mop or mechanical spreader. Cold-applied adhesives typically are solvent-based asphalts that do not have to be heated in a kettle or tanker. The most common surface for built up roof systems consists of gravel with a heavy application of asphalt or coal tar. The number of plies in a cross section is the number of plies on a roof: the term “four plies” denotes a four ply roof membrane construction. Sometimes, a base sheet, used as the bottom most ply, is mechanically fastened. Built up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation.
While single-ply systems have captured much of the recent press, bituminous commercial roofing systems (including modified bitumen) still represent a significant share of all low-slope roofing activity. Built-up roofing systems are still preferred by many building owners and operators.
Two basic components - felts and bitumen - are laminated in the field (built-up) to form a roofing membrane. The bitumen is usually asphalt or coal tar pitch. The asphalt serves as both the system adhesive and the waterproofing agent. Reinforcing felts provide strength and stability to the membrane. Surfacings provide opacity for UV resistance as well as fire protection. Commercial asphalt emulsion will not crack, "alligator," run, or sag under extreme weather conditions. It resists most corrosive fumes and spray.
Dunlap Roofing Company is your best option for maintenance and installing built-up asphalt emulsion commercial roofing systems in the Fresno and San Diego, CA areas.
Roof maintenance is vital to the longevity and proper performance for the life of the roof. The condition of the roof at the time of re-roofing could also play a factor in the re-roofing choices available to you.
Have a leak in your business’ ceiling? Notice peeling shingles on your business? Has a storm come through and possibly damaged your roof? We offer roof inspections and repair for all kinds of roofs in the Fresno and San Diego areas.
We are the best team to call for your commercial roof maintenance & repair in Fresno, CA. Our programs offer you peace of mind, ensuring complete roof repairs and inspections thorough moisture detection, rock removal, wind and hail damage checks and more.