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Essential Cob Construction

A Guide to Design, Engineering, and Building

Essential Cob Construction presents both hands-on and rigorous technical information on how to build code compliant, low-embodied carbon, and fire- and earthquake-resistant buildings from cob – a mix of clay, sand and straw. The definitive cob guide for engineers, architects, designers, contractors, and owner-builders.

Editor: Chris Magwood & Jen Feigin

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Description

Setting the standard for modern cob construction – from design, engineering, and building code compliance, to sculpting beautiful structures

Cob – a mix of clay, sand, and straw – is one of the most popular and well-known natural building methods. Yet cob is often difficult to permit and can be used in inappropriate ways due to a lack of sound engineering and design information. Recent research and a newly developed building code promise to make cob building more accessible than ever.

Essential Cob Construction sets the new standard for cob construction. Incorporating rigorous, up-to-date engineering and building science and decades of practical lessons learned, coverage includes:

  • Appropriate use of cob in different climates and contexts
  • Thermal performance and moisture management
  • Structural and architectural design considerations, including fire and earthquake resistance data from extensive laboratory testing
  • Hands-on cob construction, including mix design, testing, manual and mechanical mixing, wall building, strong connections with foundations, roofs, and other structural elements, and finishing options
  • Building code development and the permitting process for cob
  • Planning, budgeting, and quality control
  • The complete Cob Construction Appendix of the International Residential Code.

Essential Cob Construction is required reading for engineers, architects, designers, contractors, and owner-builders working with this ancient, aesthetically pleasing, low-carbon building material.

About The Author(s)

Michael G. Smith is a natural builder, trainer, designer, and consultant who has been working with natural building systems for over 30 years. He holds a B.S. in Civil and Environmental Engineering from MIT. In 1993 he co-founded the iconic Cob Cottage Company with Ianto Evans and Linda Smiley, reviving the ancient tradition of cob building. His hands-on workshops focus on energy efficiency, empowerment of people through simple, accessible techniques, and the regenerative use of locally available materials. Smith has led or been involved in over 100 natural building projects in North America and internationally and he is a board member of the Cob Research Institute, where he helped write the first model building code for cob. He is co-author of The Hand-Sculpted House and The Art of Natural Building and author of The Cobber’s Companion. He lives on an organic farm near Sacramento, California.

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Massey Burke is a natural materials design-build consultant, educator, and co-director of the California Straw Building Association. She has worked with cob since 2005, and focuses on removing barriers to scaling up natural, climate-positive building methods. A contributor to The New Carbon Architecture, she lives in the San Francisco Bay area, CA.

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Anthony Dente, PE, LEED AP, is a licensed engineer and principal at Verdant Structural Engineers, a firm that has designed over 200 structures using natural-building wall systems such as straw bale, adobe, rammed earth, earthbag, and cob. As vice president of the Cob Research Institute, he was the lead engineer for the Cob Construction Appendix of the 2021 International Residential Code, as well as the Hemp-Lime (Hempcrete) Appendix, both the first of their kind in the US. Dente has advised, designed, and collaborated on numerous university research programs testing the structural behavior of natural materials, and writes and lectures extensively about appropriate use of environmentally sensitive building materials. He is the CEO for Verdant Structural Products, and project lead for their prefabricated, carbon-storing, straw wall panels. Dente was recently awarded the Constellation Prize for Sustainable Engineering Practice. He lives in the San Francisco Bay area of California.

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ISBN: 9780865719682

Page Count: 160

Dimensions: 8.5 × 11 × 0.43 in

Publication Date: January 16, 2024

Images: Black & White Images + Color Section

This publication meets the EPUB Accessibility requirements, and it also meets the Web Content Accessibility Guidelines (WCAG-2.0 AA). It is screen-reader-friendly and accessible to persons with disabilities. This book contains various accessibility features such as alternative text for images, table of contents, landmarks, reading order, page list, structural navigation, and semantic structure. Blank pages have been removed from this EPUB. For further information or questions contact [email protected].

Conformance: EPUB Accessibility Compliant | WCAG 2.0 AA Compliant

Screen Reader Compatibility: Designed for optimal screen reader experience. Accessible to persons with disabilities.

Content Enhancements:
Alternative Text for Images: Descriptive text provided for all images, ensuring visual content is accessible.
Table of Contents: Easy navigation through a structured table of contents.
Landmarks: Clearly defined landmarks for quick navigation to key sections.
Reading Order: Logical and consistent reading order for sequential content consumption.
Page List: Accurate page list for physical page referencing.
Structural Navigation: Clear hierarchical structure for easy content traversal.
Semantic Structure: Use of appropriate semantic markup for content clarity and meaning.

Optimization:
Blank Page Removal: Unnecessary blank pages have been eliminated for a streamlined experience.

This publication offers text that is readable by screen readers and provides partial accessibility for persons with disabilities. It contains limited accessibility features. For further information or questions contact [email protected].

Key Accessibility Features (Partial):

Screen Reader Compatibility: Text is readable by screen readers. | Partial accessibility for persons with disabilities.

Content Enhancements (Limited):
Table of Contents: Easy navigation through a structured table of contents.
Structural Navigation: Clear hierarchical structure for easy content traversal.

Limitations and Rationale:
Partial Accessibility: The publication includes some basic accessibility features, but is not fully accessible.
Disproportionate Burden: Full remediation to meet all accessibility requirements is not provided due to the disproportionate burden.
Financial Constraints: The estimated cost of full accessibility updates (including semantic tagging, image descriptions, and enhanced navigation) significantly exceeds projected sales revenue.
Non-Viable Remediation: The publisher has determined that a complete remediation effort is not financially viable.

Part of the Sustainable Building Essentials Series

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