Structural Insulated Panel - Standardization and Design

Standardization and Design

The International Building Code references APA, Plywood Design Specification 4—Design & Fabrication of Plywood Sandwich Panels for the design of SIPs. This document addressed the basic engineering mechanics of SIP panels but does not provide design properties for the panels provided by any specific manufacturer. In 2007, prescriptive design provisions for OSB faced SIPs were first introduced in the 2006 International Residential Code. These provisions provide guidance on the use of SIPs as walls panels only.

Aside from these non-proprietary standards, the SIP industry has relied heavily on proprietary code evaluation reports. ICC-ES issues numerous evaluation reports, most commonly to major manufacturers. In early 2009, SIPA partnered with NTA Inc, a product certification agency, to produce the first industry wide code report which is available to all SIPA members who qualify. Unlike previous code reports, the prescriptive provisions provided in the SIPA code report are derived from an engineering design methodology which permits the design professional to consider loading conditions not addressed in the code report.

While the use of SIPs has many potential benefits, caution must be used to ensure that the lack of consideration for such effects does not lead to the creation of ill-designed structures. Use of an experienced architect or designer will minimize this potential issue.