The National Roofing Contractors Association Offers Green Roof Systems Manual – 2007 Edition
The National Roofing Contractors Association (NRCA) has released The NRCA Green Roof Systems Manual – 2007 Edition. The manual provides in-depth technical information regarding the design and installation of quality green roof systems. The focus of the manual is waterproofing aspects of green roof systems.

NRCA defines a green roof system as plantings/landscaping installed above a waterproofed substrate at any building level that is separated from the ground beneath it by a manufactured structure. A green roof system consists of a waterproofing system and its associated components – such as protection course, root barrier, drainage layer, thermal insulation and aeration layer – and an overburden of growth medium and plantings. NRCA divides green roof systems into three primary categories: extensive (shallow), semi-intensive (moderate depth) and intensive (deep).

The green roof system details in The NRCA Green Roof Systems Manual – 2007 Edition provide design and installation information for:
•    Hot-fluid applied, polymer-modified asphalt membranes;
•    APP- and SBS-polymer-modified bitumen sheet membranes;
•    EPDM membranes;
•    PVC membranes;
•    One- and two-component, fluid-applied elastomeric membranes.

The manual provides limited information about green roof system components that are not waterproofing-related, such as growth medium, filter fabric and reservoir layer.

For more information about The NRCA Green Roof Systems Manual – 2007 Edition or to place an order, visit shop.nrca.net; fax: (847) 299-1183; or call NRCA InfoExpress at (866) ASK-NRCA (275-6722).