|TPI 1: National Design Standard for Metal Plate Connected Wood Truss Construction|
ANSI/TPI 1 establishes minimum requirements for the design and construction of metal-plate-connected wood Trusses. This Standard describes the materials used in a Truss, both lumber and steel, and design procedures for Truss members and joints. Responsibilities, methods for evaluating the Metal Connector Plates, and manufacturing quality assurance for the Trusses are also contained in this Standard.
TPI 1 was first published as an ANSI Standard in 1995 (ANSI/TPI 1-1995). Since 1995, TPI has been updated through TPI's ANSI approved consensus process. Subsequent TPI 1 publications are the ANSI/TPI 1-2002 edition and the recently released ANSI/ TPI 1-2007 edition. Prior to 1995, TPI published earlier predecessors to TPI 1 and copies can be viewed in the TPI Archives as well as the ANSI/TPI1-1995 edition. The TPI 1 publications currently being offered for sale are listed below. Prices shown are member/non-member.
ANSI/TPI 1-2007 (revision of ANSI/TPI-2002) - :
National Design Standard for Metal Plate Connected Wood Truss Construction (84 pages) and Commentary & Appendices to ANSI/TPI 1- 2007 (120 pages). ANSI/TPI 1-2007 will be referenced in the 2009 International Building Codes.
Some of the changes in the ANSI/TPI 1-2007 from the 2002 edition are as follows:
- Chapter 2 (Design Responsibilities) - revised to coincide with the International Building Code’s language. This Chapter has been completely reworked and is now broken into two different and distinct sections: One for structures that are exempt from requiring a Registered Design Professional and the other for non-exempt structures.
- Chapter 3 (In-Plant Quality Control) - revised and refined with the procedures that were outlined in the Appendix (Tooth Count Method) now incorporated into the Chapter as one method.
- Chapter 6 (Materials & General Design Considerations) - no longer contains truss installation tolerances as this information is not a design issue and is covered in the BCSI documents. Serviceability concerns are also discussed in more detail.
- Chapter 7 (Member Design) - allows increases in bearing perpendicular-to-grain values if certain criteria is met at truss bearing locations. The L’/d ratios for compression and tension members were addressed and could provide less reinforcement requirements on web members.
- Chapter 8 (Plate Design) - addresses the limit on tension introduced into a wood member (Section 8.8.2) by providing a user note that TPI’s Technical Advisory Committee recommends 2300 pounds.
Download Order Form
Portions of ANSI/TPI 1-2007 available on-line:
- TPI Alternative Joint Inspection Procedure Using a Specified Position Tolerance (PDF) Note: this alternative joint inspection method was developed by members of the industry and has been reviewed by the TPI Technical Advisory Committee (TAC) and approved by the TPI Board. Although it is currently not part of an ANSI approved standard, it is TPI's opinion that this method adequately satisfies the intent of the inspection procedures speciied in Section 3.7 of the ANSI/TPI1-2007 National Design Standard for Metal Plate Connected Wood Truss Construction.
ANSI/TPI 1-2002 (revision of ANSI/TPI-1995):
National Design Standard for Metal Plate Connected Wood Truss Construction (69 pages) and Commentary & Appendices to ANSI/TPI 1- 2002 (116 pages). A CD of the ANSI/TPI 1 Standard, Commentary, Appendices and all Errata & Addendums issued at date of purchase are included with this 2-book set. ANSI/TPI 1-2002 is referenced in the 2003 International Building Codes.
Download Order Form
Portions of ANSI/TPI 1-2002 available on-line:
Visit the following related links for further information related to TPI's Publications.