The traditional hot-mopped roof system has been in existence for over 175 years. Asphalt, a petroleum by-product, is the major component of this system. The major advantages to an asphalt roof are that it’s cost effective and extremely durable when properly applied. Platinum Roofing uses a crew of experienced applicators for proper installation of all hot asphalt roof systems.
A well-installed hot-mopped roof with four reinforcing plies (4-ply) provides up to 280 mils in waterproofing protection and thickness for foot traffic. Mineral surface cap sheets can be installed with white acrylic applied directly to the surface in the factory so it can comply with the new “Title 24” requirments. The redundancy in layers gives the added insurance of a long-lasting roof, which should remain serviceable for at least 25 years. If the white reflective coating is reapplied every 10 years or so, it could last indefinitely.
There is the perception that hot-mopped roofs have lost their edge in today’s re-roofing but this has to do with the quality of workmanship. In my inspection of existing multi-ply hot asphalt roof systems, I find there to be a wide range of standards in asphalt application. In my opinion, when properly applied, this is still the best roofing system in the industry.
The main drawback in the past to hot asphalt roofing, has been the odor. There is now low-fuming asphalt and additives that virtually eliminate fumes and odors. Factors to consider for re-roofing with asphalt are building access, the amount of rooftop mechanical equipment, height, existing roofing layers, and weather.