Maintain the membrane

NRCA's latest manual updates roof membrane best practices


This month, NRCA released The NRCA Roofing Manual: Membrane Roof Systems—2019, the latest volume in The NRCA Roofing Manual series. This volume replaces The NRCA Roofing Manual: Membrane Roof Systems—2015. The new volume provides up-to-date NRCA best practice guidelines for the design and installation of membrane roof systems, including built-up roof membranes, polymer-modified bitumen membranes, thermoset and thermoplastic single-ply membranes, and liquid-applied membranes.

The outline

The updated manual uses the same 10-chapter format as the previous volume and is formatted as a reference manual. Designers who intend to use the publication as a guide for designing roof assemblies should start at the beginning in Chapter 1—Roof Assembly Configurations and select a roof assembly configuration that fits a project's basic description. Each configuration includes a list of applicable roof assembly components with references to where detailed information about each component is located.

Chapters 2 through 8 are arranged to address each of the following roof assembly components in order from bottom to top of typical roof assemblies: roof decks, air and vapor retarders, rigid board insulation, roof membranes, fasteners, surfacings and roof accessories.