P. DESIGN CONSIDERATIONS
P1.
ACOUSTICS: NOISE AND VIBRATION CONTROL
CRITERIA FOR QUALIFICATION Note: This measure applies to multi-family projects only.
Up to two points will be awarded based on service credits, which are awarded based on the noise reduction practices enacted, as follows:
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Five service credits— One point Ten service credits— Two points
Practices that qualify for this measure are as follows:
Tier 1( one service credit each): �
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Exterior Noise Reduction: Based on the project’ s environmental noise report, provide sound-rated exterior windows, exterior doors, walls, and / or roofs in order to achieve a Day-Night Sound Level( DNL) of 40 dB or less. This is 5 dB better than is called for by code. Loud Single-Event Noise Reduction in Noise-Sensitive Locations: Noise attributable to regularly occurring single-event exterior sources( considered to be L 10 for the purposes of this document) shall not exceed 50 dBA in bedrooms and 55 dBA in living rooms. The project must be designed to meet the L 10 standard. Mitigation measures can be verified in an environmental noise report. Airborne and Structure-Borne Noise Reduction: Design party walls and floor-ceilings between bedrooms and living rooms to have STC and IIC ratings that are five points better than the minimum California code requirements. Mechanical Ventilation Noise and Vibration Control: Develop guidelines for the project and completed construction( per the 2011 ASHRAE Handbook, Chapter 48,“ Sound and Vibration Controls”) to minimize noise and vibration from mechanical ventilation equipment. This includes, but is not limited to, the following:
– Rooftop equipment – Garage fans – Ventilation systems and heat pumps within units – Discharge and intake noise – Noise generated by grilles and registers
Plumbing Noise and Vibration Reduction: Develop guidelines for the project and completed construction to reduce plumbing noise to a maximum of 35 dBA in bedrooms, living rooms, and dining rooms( per the 2011 ASHRAE Handbook, Chapter 48,“ Noises from Plumbing Systems”). Pipes shall not be run in a bay. Pipes shall be secured without making direct contact with any structural elements( such as studs, floor slabs, drywall, etc.). All water piping should be isolated with resilient mounts and felt or neoprene pads to avoid direct contact with structural elements. Pipes should be braced without bridging any air gaps in demising walls separating residential units from other units or public areas.
Tier 2( ½ service credit each): �
DRAFT
Stair Impact Noise Reduction: Design stairs to be separated from sleeping areas. Design stair stringers adjacent to the dwelling unit to only be connected at landings( top and bottom). Public
DRAFT GreenPoint Rated New Home Rating Manual Version 6.0, September 2013 111 © Build It Green