DRAFT GreenPoint Rated Existing Home Rating Manual version 6.0 | Page 52

E

Exterior ? ?

A minimum of a 40-year warranty and a 3-year workmanship warranty. An assembly carrying a “Class A” fire rating, per American Society of Testing and Materials (ASTM) E-108 or UL-790.

Flat roofs and assemblies (that is, roofs with a slope less than 2:12) must have all of the following attributes: ? ? A Class A fire rating, per ASTM E-108 or UL-790. A minimum of a 10-year material warranty and a 3-year workmanship warranty. Roofing Warranty for Shingle Roofing (Required)

E4.2.

Note: This measure applies only to multifamily homes. All shingle roofing must carry a 3-year subcontractor warranty and at least a 20-year manufacturer’s warranty. VERIFICATION Field Verification: The Rater should complete field verification of roofing material, compare the material to the specifications, and take representative photos of the roof. Documentation: The Rater must collect the following: ? ? ? Class A rating, where appropriate A copy of the manufacturer’s warranty and sub-contractor’s warranty A building plan detailing roofing material specifications (optional)

INTENT To promote durability and reduce material consumption through the use of long-lasting products. To increase safety through the use of fire resistant materials.

E5.

VEGETATED ROOF

CRITERIA FOR QUALIFICATION Up to four points of credit may be given for covering a percentage of the total roof area with a vegetated roof, as follows: ? ? Two points for a minimum of 25% of the total roof area Four points for a minimum of 50% of the total roof area

Use the best available practices in structure, waterproofing, soil design, plant selection, and maintenance to install the vegetated roof. The percentage of the roof area is measured on the horizontal plane. Intensive or extensive roofs receive equal credit.

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GreenPoint Rated Existing Home Rating Manual Version 6.0, September 2013 © Build It Green