In September, NRCA published Quality Control and Quality-assurance Guidelines for the Application of Membrane Roof Systems. This new publication provides NRCA's latest best practice guidelines for assessing the application of built-up, polymer-modified bitumen, EPDM and thermoplastic membrane roof systems.
QC and QA
Quality control (QC) and quality assurance (QA) are essential elements of roof membrane construction. However, the parties that implement these two concepts differ.
QC is the responsibility of and is performed by roofing contractors. It is a contractor's responsibility to designate an individual to be on-site during the entire application process; that individual may be a working member of the crew, such as a foreman. This person should thoroughly understand the membrane roof system being installed and have the authority to immediately correct noncompliant work.