With a closed cell polyiso foam core and inorganic coated glass facers, this high-density cover board from Johns Manville has a Grade 1 compressive strength and an R-value of 2.5.
EPDM single-ply roofing membranes became increasingly popular in the 1970s as the price of asphalt-based roofs increased and the quality of available asphalt lowered.
Roofing contractors need to be experts in their field to be successful; they also need to understand what property owners are looking for in roofing contractors and roofing systems.
From technology and durability to worker safety and environmental consciousness, asphalt roofing systems advanced significantly over the past three decades
July 15, 2016
Over the last three to four decades, asphalt roofing systems have made great advances, from technology and durability to worker safety and environmental consciousness.