The ANSI/TPI 1 standard is maintained following ANSI’s periodic maintenance schedule, which requires the entire standard to be re-opened for revisions, reaffirmation, or withdrawal on a five-year cycle based on the last ANSI approval date as an American National Standard. The latest edition of the ANSI/TPI 1 standard (2014) was approved as an American National Standard on August 27th, 2014. The project to revise/reaffirm the ANSI/TPI 1-2014 standard is now active.

ANSI/TPI 1 Scope

The TPI 1 standard 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. Methods for evaluating the metal connector plates, manufacturing quality assurance, and responsibilities in the design process involving metal plate connected wood trusses are also contained in the standard.

Follow and participate in this project as it progresses:

COMPLETED PHASE 1: Project Initiation (see below for more information)

NOW ACTIVE PHASE 2: Project Committee Formation (see below for more information)

PHASE 3: Project Committee Work and Balloting

PHASE 4: Public Review

PHASE 5: Final Approval

PHASE 1: Project Initiation

As an accredited ANSI American National Standards Developer, TPI must ensure that the ANSI/TPI 1 standard remains current and relevant by means of timely revision or reaffirmation. TPI accomplishes this through the periodic maintenance procedures as defined in ANSI’s Essential Requirements, which requires the review of the entire standard and action to revise or reaffirm it on a schedule not to exceed five years from the date of its approval as an American National Standard. The ANSI/TPI 1-2014 standard was  last approved as an American National Standard in August 2014. Therefore, it will be opened for revision/reaffirmation in August 2019.

TPI provides notification of standards activity using the ANSI Project Initiation Notification System (PINS), and through TPI press releases. See the current notifications below:

PHASE 2: Project Committee Formation

A consensus body (or Project Committee) is selected by TPI from a list of qualified applicants to hear, discuss, and vote on any proposed changes to the TPI 1 standard. The Project Committee is carefully appointed to ensure that it is appropriately balanced with parties that are materially affected by the standard. For the ANSI/TPI 1 standard, this includes the following categories of members:

  • Producers: MPC Wood Truss Manufacturers, Metal Connector Plate Manufacturers, Lumber Producers, Product Associations, and any others that produce or promote products for the Metal Plate Connected Wood Truss industry.

  • Users: Engineers, Architects, Building Officials, Building Designers, Truss Designers, and any others that use the ANSI/TPI 1 standard in their business.

  • General Interest: Academia, Code Development Organizations, Consumer Associations, Homeowners, Other Industries


TPI is now accepting applications for the TPI 1 Project Committee for the revision/reaffirmation of the ANSI/TPI 1-2014 standard. Those wishing to apply must submit a PC Application Form to TPI by December 31, 2019. The Project Committee size will be limited, but will include an appropriate balance of Producers, Users, and General Interest members.