Addendum to Joint Appendix IV
Approved Alternative Construction Assemblies

If a construction assembly is not adequately represented in Title 24's Joint Appendix IV, an applicant may request approval by the Energy Commission's Executive Director for different data for that construction data. The Executive Director will base the decision on the application on the technical justification submitted by the applicant. Approved standard data for the construction assembly will be published as an addendum to Joint Appendix IV for use in all compliance approaches.

The following list is to be used as an addendum to Joint Appendix IV. Information sheets can be downloaded to be used as part of building compliance applications.

Subsequent alternatives will be attached in order of date approved.

Assemblies

• Standard U-Factor Data for Wood Framed Attic Roofs With Insulation Only Between the Ceiling Joists.
  Date posted: June 3, 2009. (PDF file, 3 pages, 500 kb.)
• Standard U-Factor Data for Wood Framed Attic Roofs With Insulation That Completely Covers the Ceiling Joists.
  Date posted: June 3, 2009. (PDF file, 3 pages, 500 kb.)
• Standard U-Factor for Insulated Metal Panel Walls.
  Date posted: March 23, 2007. (PDF file, 2 pages, 1.12 megabytes.)
• Standard U-Factor Data for Insulated Metal Panel Roofs and Ceilings.
  Date posted: February 14, 2007. (PDF file, 2 pages, 283 kilobytes.)
• Standard U-Factor Data For Wood Framed Floors Without a Crawl Space.
  Posted: March 15, 2006. (PDF file, 3 pages, 1.54 megabtes)
• Standard U-Factor Data For Spandrel Panels and Glass Curtain Walls.
  Posted: January 9, 2006. (PDF file, 4 pages, 2.0 megabtes)
• Standard U-Factor Data for Wood Framed Rafter Roofs.
  Posted: December 14, 2005. (PDF file, 4 pages, 2.5 megabtes)
• Standard U-Factor Data for Metal Framed Rafter Roofs.
  Date posted: December 14, 2005. (PDF file, 4 pages, 2.5 megabtes)
• Standard U-Factor Data for Wood Framed Attic Roofs.
  Posted: September 1, 2005. (PDF file, 3 pages, 332 kilobytes)
• Standard U-Factor Data for Metal Framed Walls for Low-Rise Residential Buildings.
  Date posted: June 14, 2005. (PDF file, 4 pages, 4.0 megabtes)