Rating System

LEED BD+C: New Construction, LEED BD+C: Core and Shell, LEED BD+C: Schools

Rating System Version

v3 - LEED 2009, v2 - Schools 2007, v2 - LEED 2.2

Inquiry

This inquiry is about the accepted non-native sedum based plant mix that will meet credit requirements for green roof system. The facility is located in Boston MA area, USDA Plant Hardiness Zone 6a. Native New England is heavily forested, relatively damp and contains soil with high organic content. A roof top in New England is in full sun, windy, dry and includes mostly inorganic lightweight minerals for soil media with relatively low organic content. Based on this most native species will not survive the rooftop environment without significant levels of maintenance including regular watering and fertilization. The sedums, succulents and other hardy plants that compose traditional green roof plant palettes are ideally suited for the New England rooftop climate. They would be the lowest maintenance for a green roof system, requiring no permanent irrigation, limited fertilization (annual slow release only), no herbicide or pesticide treatments and overall minimal attention from humans. The green roof system we are asking for acceptance on is: Primary - system  15% Sedum spurium, Dragon\'s Blood  15% sedum kamtschaticum var., floriferum, Weihenstephaner Gold  15% Sedum album, Murale  15% Sedum ternatum, (North American native)  10% Sedum oreganum, (North American native)  10% Sedum rupestre, Angelina  10% Sedum spurium, John Creech  10% Sedum kamtschaticum Secondary - system - 25% of the primary palette to be replaced with mix of at least two of the following:  Allium schoenoprasum (North American native)  Opuntia humifusa (North American native)  Sedum cauticola, cauticola Lidakense or cauticola Betram Anderson  Sedum reflexum  Sedum spurium Tricolor