DRAFT GreenPoint Rated Existing Home Rating Manual version 6.0 | Page 63

G

Plumbing

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evidence of irrigation leaks, including ponding, broken irrigation heads, mushrooms growing in the lawn, sink holes, etc. Visually examine the plumbing system for overall integrity by looking for small leaks or water stains that indicate current issues (not historic issues) throughout the house and looking for excessive corrosion on pipes that would constitute a leak or a potential leak. Check for sewer gas leaks by visually evaluating waste and vent lines for breaks or leaks where possible. If the odor of sewer gas is present in the home and no leak is identified, alert the homeowner that further investigation may be required to correct the issue. Prevent backflow in the irrigation system through the following practices: Ensure that hose bibs have a non-removable backflow preventer or non-removable vacuum breaker. These typically consist of a brass screw on a fitting with a set screw that breaks off, or a hose bib may be designed with a backflow prevention device (CPC 603.4.7). Ensure that every landscape watering device that connects to the potable water system has a backflow prevention valve. The backflow prevention device must meet the requirements of CPC 603.4.6, “Protection from Lawn Sprinklers and Irrigation Systems.” Devices must be installed according to CPC Table 6.2. Protect the potable water supply to the irrigation system from backflow with a pressure vacuum breaker, atmospheric vacuum breaker, spill-resistant pressure vacuum breaker, or reduced-pressure backflow preventer. All water heaters must be strapped. The current code is a retroactive code that requires all new and existing water heaters to be braced, anchored, or strapped to prevent falling or horizontal movement due to seismic activity. Central system boilers and water heaters must have a backflow prevention valve on the cold water supply (CWS) line. No visual signs of water leakage should be present in the boiler room or where readily visible in the distribution piping.

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VERIFICATION Field Verification: The Rater shall conduct field compliance verification using the GreenPoint Rater Existing Home Field Checklist, and take representative photos of conditions for verification. INTENT To conserve water and prevent water damage from leakage.

G6.

CENTRAL DOMESTIC HOT WATER SURVEY AND TUNE-UP

CRITERIA FOR QUALIFICATION Note: This measure applies to multifamily projects only. Up to three points are available, as follows: G6.1. CDHW System Survey and Maintenance Manual (1 Point)

A contractor with a Class C-4 (Boiler, How Water Heating and Steam Fitting Contractor) or Class C-36 (Plumbing Contractor) license will complete a thorough inspection of all system components using the CDHW Checklist or an equivalent document. The CDHW Survey documents existing conditions using a GreenPoint Rated Existing Home Rating Manual Version 6.0, September 2013 © Build It Green 57