Strawbale Construction Building Codes

Supporting Documents

This page is a repository for supporting documents for Appendix S - Strawbale Construction, which is included in the 2015 International Residential Code (IRC). 

Here you will find testing reports, research papers, professional and academic journal papers, support letters from licensed design professionals, and other references. This page was established on Dec 26, 2012. (Most recent update - May 18, 2016)

A Code Change Proposal to first include a Strawbale Construction appendix in the IRC was submitted to the International Code Council (ICC) on January 3, 2013. The proposal was approved with a 9-1 vote by the IRC Building Committee at the ICC Committee Action Hearings in April 2013. On October 4, 2013 the proposal received final approval at ICC's Public Comment Hearings. In May 2014 Appendix S was published in the 2015 IRC.

Three Code Change Proposals (RB366-16, RB367-16 and RB368-16) were submitted to ICC on January 11, 2016 to modify Appendix S for the 2018 IRC. The Proposals and their Reason Statements can be seen via the link on each proposal number above.  Supporting documentation for structural aspects of those proposals can be found under Structural Use below. Supporting documentation for proposed R-values in RB368-16 can be found under Thermal Insulation below.

On April 23, 2016 all three proposals were approved at the IRC Committee Hearings in Louisville, KY with 11-0 votes by the IRC-B Code Committee. Public Comments on all IRC proposals are accepted by ICC until July 22, 2016. Public Comment Hearings will occur October 19-25, 2016 in Kansas City, MO with voting to either ratify the decisions by the IRC-B Code Committee or to vote in favor of Public Comments to overturn the Committee decision and/or modify the proposals.

Please direct all inquiries to Martin Hammer: This email address is being protected from spambots. You need JavaScript enabled to view it. or 510-684-4488

Strawbale Construction Appendix in the 2015 IRC:

2015 IRC Appendix S - Strawbale Construction
Text of the Strawbale Construction appendix as it appears in the 2015 International Residential Code (IRC). Commentary and illustrations for Appendix S appear in the 2015 IRC and Commentary publication. Appendix S with Commentary is available for free download at (with ICC permission)

Support Letters from Licensed Design Professionals

Support Letters for IRC Appendix - Strawbale Construction *
Support letters for the original 2013 proposal from 2 Structural Engineers, 4 Civil Engineers, 1 Professor of Civil Engineering, 5 Architects

Recommended Provisions for Engineered Strawbale Construction

Recommended Building Code Provisions for Engineered Strawbale Construction (not codified)

Supporting Documents by Category:

(* Indicates document in direct support of the approved Appendix S in the 2015 IRC *)
(** Indicates document in direct support of Code Change Proposals RB366-16, RB367-16 and RB368-16 for Appendix S in the 2018 IRC **)