Are You Ready to LEEDv4?

Posted on 3/31/2014 1:47:51 PM By Paul Bertram

leed, usgbc, leedv4

LEEDv4 Background

At Greenbuild 2013, in November, the US Green Building Council formally launched LEEDv4. This announcement was proceeded by years of work and 6 public comment periods.  LEEDv4 has stirred more discussion than any previous version with some significant updates.

Adhesives and Sealants as related to building envelope will likely impact material evaluation & specification for LEED BD+C: New Construction | v4: projects as follows:

  • Minimum energy performance
    • Option 1. Whole-building energy simulation
      • Demonstrate an improvement of 5% for new construction, 3% for major renovations, or 2% for core and shell projects in the proposed building performance rating compared with the baseline building performance rating. Calculate the baseline building performance according to ANSI/ASHRAE/IESNA Standard 90.1–2010, Appendix G, with errata (or a USGBC-approved equivalent standard for projects outside the U.S.), using a simulation model
      • – Air Barrier Design
        • Includes all joints, interconnections, and penetrations
      • Acceptable materials
        • B. Sealants/tapes to have an average air leakage rate not to exceed 0.04 cfm/ft2 when tested to ASTM - E 2357,  1677, 1680, 283
  • Building life-cycle impact reduction
    • To encourage adaptive reuse and optimize the environmental performance of products and materials
    • Option 4. whole-building life-cycle assessment
    • Conduct a life-cycle assessment of the project’s structure and enclosure that demonstrates a minimum of 10% reduction, compared with a baseline building, in at least three of the six impact categories listed below, one of which must be global warming potential
      • The service life of the baseline and proposed buildings must be the same and at least 60 years old to fully account for maintenance and replacement. Use the same life-cycle assessment software tools and data sets to evaluate both the baseline building and the proposed building, and report all listed impact categories. Data sets must be compliant with ISO 14044
      • Select at least three of the following impact categories for reduction:
        • global warming potential (greenhouse gases), in CO2e;
        • depletion of the stratospheric ozone layer, in kg CFC-11;
        • acidification of land and water sources, in moles H+ or kg SO2;
        • eutrophication, in kg nitrogen or kg phosphate;
        • formation of tropospheric ozone, in kg NOx or kg ethene;
        • depletion of nonrenewable energy resources, in MJ.
    • Note: The above LEEDv4 requirements and options are indications that adhesives and sealant manufacturers and/or an industry wide Life Cycle Assessment (LCA)  database for needs to be developed for inclusion in various life cycle inventory (LCI) databases.
    • ASC plays a key role in addressing this industry need with participating members input
  • Building product disclosure and optimization - environmental product declarations
    • To encourage the use of products and materials for which life-cycle information is available and that have environmentally, economically, and socially preferable life-cycle impacts.
    • Option 1. environmental product declaration (EPD)
      • Environmental Product Declarations which conform to ISO 14025, 14040, 14044, and EN 15804 or ISO 21930 and have at least a cradle to gate scope. Industry-wide (generic) EPD
        •  Products with third-party certification (Type III), including external verification, in which the manufacturer is explicitly recognized as a participant by the program operator are valued as one half (1/2) of a product for purposes of credit achievement calculation
      • Product-specific Type III EPD -- Products with third-party certification (Type III), including external verification in which the manufacturer is explicitly recognized as the participant by the program operator are valued as one whole product for purposes of credit achievement calculation.
    • Note:  Environmental Product Declarations (EPDs) are how an LCA is reported (LCAs are internal reports used to understand environmental impacts and recognize areas that can be improved). Option 2. Multi-attribute optimization is another pathway for compliance in this credit area.
    • ASTM is the program operator developing the product category rule for sealants. ASC (pg. 16&17) will help facilitate the education arm of the PCR development effort by providing to its members webinars, modified short courses, and conference speakers who are subject matter experts on PCR and EPD development.

  • Building product disclosure and optimization - sourcing of raw materials
  • Building product disclosure and optimization - material ingredients
    • To encourage the use of products and materials for which life-cycle information is available and that have environmentally, economically, and socially preferable life-cycle impacts. To reward project teams for selecting products for which the chemical ingredients in the product are inventoried using an accepted methodology and for selecting products verified to minimize the use and generation of harmful substances. To reward raw material manufacturers who produce products verified to have improved life-cycle impacts
      • Goals
        • Improve the indoor environment from a human health perspective
        • Reduce barriers to materials transparency
        • Improve the understanding of health impacts of building materials
        • Bring materials transparency and product optimization into the mainstream
      • Background
        • In 2012, USGBC received a grant to explore the effects of materials and increase marketplace awareness and adoption. One of the key objectives includes:
          • Consistency: Harmonizing product transparency and optimization programs—finding the similarities and differences from one transparency program to the next—provides the clarity manufacturers and suppliers need to do in order to make informed decisions and help advance material health in building products.
          •  USGBC has challenged both manufacturers and designers to demonstrate their commitment to being ready for LEED v4 by October 2014.

            Health Product Declaration, HPD, HPDs
  • Low-emitting materials
    • To reduce concentrations of chemical contaminants that can damage air quality, human health, productivity, and the environment
    • Emissions and Content Requirements
      • General emissions evaluation. Building products must be tested and determined compliant in accordance with California Department of Public Health (CDPH) Standard Method v1.1–2010, using the applicable exposure scenario.
        • The manufacturer’s or third-party certification must state the exposure scenario used to determine compliance. Claims of compliance for wet-applied products must state the amount applied in mass per surface area.

          CPDH, California Public Health, California department of public health, public health
        • Manufacturers’ claims of compliance with the above requirements must also state the range of total VOCs after 14 days (336 hours), measured as specified in the CDPH Standard Method v1.1:
        • 0.5 mg/m3 or less; between 0.5 and 5.0 mg/m3; or 5.0 mg/m3 or more.

voc, emissions, interior adhesives, interior sealants, leed, leedv4, usgbc
  • Manufacturers CSI 3 Part Specifications
    • LEEDv4 project requirements impact manufacturer’s specifications and they should be reviewed carefully as to what of these credits should be included in the material
      CSI Part 1 &2 Specifications.

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