Masonry Magazine November 2009 Page. 22
GREEN BUILDING & NATURAL STONE
Masonry: What is the update on natural stone with regard to LEED certification?
Mattke: There are a variety of ways that stone can currently contribute to LEED points:
SS Credit 7.1: Heat Island Effect, Non-Roof: Using light-colored natural stone with a solar-reflective index of 20 or greater can reduce heat-island effects.
EA Credit 1: Optimize Energy Performance: Natural stone has good thermal mass, which positively impacts indoor ambient air temperature and, thus, energy efficiency.
MR Credits 1.1 & 1.2: Building Reuse, Maintain 75 percent to 95 percent of Existing Walls, Floors, and Roof: These credits apply if the life-cycle of existing building stock can be maintained in a project.
MR Credits 2.1 & 2.2 Construction Waste Management, Divert 50 percent to 75 percent from Disposal: These credits apply if "waste" stone used in construction is diverted to a beneficial use, rather than being disposed.
Credits 3.1 & 3.2 Materials Reuse, 5 percent to 10 percent: These credits apply if salvaged stone products can be reused for another purpose in a building design.
MR Credits 5.1 & 5.2 Regional Materials, 10 percent to 20 percent Extracted, Processed & Manufactured: These credits apply if the project uses natural stone that has been extracted, harvested or recovered, as well as manufactured, within 500 miles of the project site for a minimum of 10 percent (based on cost) of the total materials value (if only a fraction of a product or material is extracted/harvested/recovered and manufactured locally, then only that percentage, by weight, contributes to the regional value).
In anticipation of the development and release of future versions of LEED 2009, a revised point system based on the application of life-cycle assessment to support LEED credits, the NSC relies on the data collected through the benchmarking survey. The resulting life-cycle inventory data sets have been Natural Stone, continued on p.22
TROW & HOLDEN STONE HAMMERS
The most rugged, versatile and cost effective tools of the trade. The widest variety of styles and sizes, made from the finest materials. Tools that last and last, even when used on the hardest stone. MADE TO LAST SINCE 1890 IN BARRE, VERMONT USA
TROW & HOLDEN COMPANY
FINE STONEWORKING TOOLS
45 South Main Street Barre, Vermont 05641
Toll-Free 1-800-451-4349-802-476-7221
www.trowandholden.com
Please write or call for a free catalog.
READER SERVICE #167
Products to Watch
Green Concrete Mix
QUIKRETE's Green Concrete Mix consists of a blended concrete mix composed of 50 percent recycled materials, which include recycled aggregates, fly ash (a post-industrial by-product) and/or slag cements. With the use of recycled materials, QUIKRETE Green Concrete Mix diverts material from the waste stream and preserves virgin aggregate resources. As an example, for each 60-pound bag of material, there is about 0.25 cubic feet of waste diverted from the landfill volume. Suitable for general concrete work, the mix offers a similar set-time and strength characteristics as standard QUIKRETE Concrete Mix. QUIKRETE Green Concrete Mix reaches a compressive strength of 3,500 psi in 28 days and meets the performance requirements of ASTM C 387. The mix also qualifies for points within the Recycled Content and Regional Material classifications as defined through the U.S. Green Building Council's LEED Green Building certification. QUIKRETE Green Concrete Mix is currently available in northern California and the Pacific Northwest with additional expansion based on market demand and interest.
Natural Stone
Veneer Mortar
QUIKRETE's newest addition is a line of veneer stone mortars, QUIKRETE Natural Stone Veneer Mortar, a contractor-grade mortar mix designed for veneer applications and tuckpointing of natural stone. The mortar can be used as a bond or scratch coat and as mortar joint grout over code-approved substrates, including plywood with metal lath and on other concrete and masonry surfaces. The coverage in joints will vary with width. The line includes the standard QUIKRETE Veneer Stone Mortar, which can be used in mortar joint applications, as a bonding coat to adhere stone to a wall and as a 3/8- to ?-inch scratch coat over expanded metal lath, and the QUIKRETE Polymer Modified Veneer Stone Mortar for improved mortar to unit compatibility and optimal bond strength. The mortars are available in 80-pound bags and 3,000-pound super sacks. Custom formulations are available including integrally colored blends to meet specific large project requirements.