Description of the Wall

Wall Specifications

NatureBuilt BioSIP Wall Specifications
Insulation Value: Total wall: R-351
Dimensions: Standard wall heights2: 97” & 115” (based on bale heights)
Standard wall lengths: 36” to 115”
Standard wall thickness: 16”
Weight: ~250 lbs / lineal ft. of wall (8’ x8’ wall weighs approx. 2,000 lbs)
Fire Rating: 2 hours +3
Structural Strength: Design ratings provided by Structural Engineer (up to 3 storeys)
Connections: Connections between wall components and foundations are according to engineered specifications using GRK® timber screws
Skins: Interior – 1” thick cement lime plaster, formed finish
Exterior – 1” thick cement lime plaster, finished as specified
Insulation: Main wall: Compressed straw bales (7 lbs/cuft)
Bottom Plate: Roxul® Batt Insulation (3.5” x 12”)
Top Plate: EPS foam (1.5” x 9”)
Electrical: Electrical boxes are built into walls prior to installation. Electrical wires are fed through conduit and tied into the boxes
Specific uses: These walls are used for above grade exterior applications

1According to a variety of studies conducted: “Heat Insulation Performance of Straw Bales and Straw Bale Walls”, Vienna University of Technology; CMHC – Technical series 02-115; and “Thermal Performance of Straw Bale Wall Systems” by Nemiah Stone

2Custom wall heights are available. Please inquire: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

3 According to ASTM E 119-05a Project No. 3098054A, July 9 2007 conducted by Intertek Testing Services Inc. Prepared for Ecological Building Network

Credit Credit Name Requirement Contribution How NatureBuilt Contributes
EA Credit 1 Optimize Energy Performance Reduce design energy cost compared to the energy cost of the MNECB / CBIP OR ASHRAE/IESNA 90.1 - 1999 reference building for energy systems regulated by these standards.   up to 4 points R-35 Insulation & Elimination of thermal bridges
MR Credit 5.1 & 5.2 Regional Materials Use a minimum of 10% OR 20% of building materials or products for which at least 80% of the mass is extracted, processed and manufactured within 800 km (500 miles) of the project site. 1 point for 10% 2 points for 20% Ontario manufacturing
MR Credit 6 Rapidly Renewable Materials Use rapidly renewable building materials and products (made from plants that are typically harvested within a ten-year cycle or shorter) for 5% of the total value of all building materials and products used in the project. 1 point    Plant based insulation, annually renewable
MR Credit 7 Certified Wood Use a minimum of 50% of wood-based materials and products, certified in accordance with the Forest Stewardship Council's Principles and Criteria, for wood building components. 1 point    FSC wood used in wall framing
IAQ Credit 4.1 Low-Emitting Materials: Adhesives & Sealants The VOC content of adhesives, sealants and sealant primers used must be less than the VOC content limits of the State of California's South Coast Air Quality Management District (SCAQMD) Rule #1168, October 2003. 1 point    Sealant used between wall sections is low-VOC
IAQ Credit 4.2 Low-Emitting Materials: Paints & Coatings VOC emissions from paints must not exceed VOC and chemical component limits of Green Seal's Standard GS-11, Jan. 1997 requirements. 1 point    VOC-free Silicate paint is used on wall surface

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