DRAFT GreenPoint Rated Existing Home Rating Manual version 6.0 | Page 21

B

Foundation

B5.

MOISTURE CONTROLLED CRAWLSPACE

CRITERIA FOR QUALIFICATION One point of credit may be given if all of the following criteria are met: ? ? ? ? ? A premium vapor retarder system, with a minimum 6-mil thickness, is installed in the crawlspace The vapor retarder is extended up the wall and piers, and is affixed with adhesive/caulk, furring strips, or treated wood nailer. Vapor retardant is installed over the entire crawlspace floor. The vapor retarder is continuous, with seams and joints lapped 12 inches, staked to the ground, taped, and sealed with mastic at piers, pipes, etc. Any penetrations or other areas where the vapor barrier has been compromised have been sealed with tape and mastic.

It is recommended that the vapor retarder be as thick as possible for durability purposes, and that the vapor retarder be white (as translucent or black plastic will make the space very dark and difficult to navigate when accessing the space in the future). VERIFICATION Field Verification: The Rater will complete field verification and take photos of the vapor retarder’s coverage, seams, joints, and attachment to walls and piers. Documentation: The Rater must collect the manufacturer’s documentation of the vapor retarder’s thickness. INTENT To improve indoor air quality and structural durability by reducing moisture migration from the crawlspace into the home.

B6.

STRUCTURAL PEST CONTROLS

CRITERIA FOR QUALIFICATION Up to two points of credit may be given, as follows: B6.1. Termite Shields and Separated Exterior Wood-to-Concrete Connections (1 Point)

This measure applies to single-family homes and multi-family low-rise buildings of one to three stories. Install a continuous, durable termite shield at the junction of the foundation and piers and mudsill, where pipes and other utilities penetrate the foundation, and wherever slab perimeter insulation is installed. Structural exterior wood elements (such as mudsills, posts, and stairs) in permanent contract with concrete or soil, such as posts, deck supports, and stair stringers, will remain moist for prolonged periods. Creating a separation with metal or plastic fasteners/dividers (for example, an elevated post holder) will allow water to drain and wood to easily dry out, or avoid wood-to-concrete connections. Note: caulking between the sill and foundation is not an acceptable means of termite shield. GreenPoint Rated Existing Home Rating Manual Version 6.0, September 2013 © Build It Green

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