Manufactured Floor and Roof Construction


Open Web Truss

Requirements for Open Web Floor and Roof Truss

An engineered system is unique to each application and is typically comprised of 2x members with metal gusset plate connections.

  1. The structural framing plans must indicate when open web trusses are being used. The location of all truss bearing points and girder trusses must be clearly shown on the plans. All bearing locations, including truss hangers, must be adequately designed for the imposed loads.
  2. Truss shop drawings for pre-engineered floor or roof trusses may be submitted after the building permit has been issued, but must be submitted prior to any truss erection. Attach the Truss Plan Cover Sheet to each set of shop drawings. At least one set must bear the original signature and seal of the truss designer licensed in the commonwealth of Virginia. Truss drawings must be submitted for single-family dwellings, and can be reviewed by Building Plan Review counter while you wait. Truss drawings for multi-family dwellings and commercial construction cannot be reviewed while you wait.
  3. The Truss Plan Cover Sheet must be filled out by the building designer. It is the responsibility of the engineer who designed the fabricated elements to ensure that such elements will carry the required loads. It is the responsibility of the building designer to perform a detailed review of the shop drawing to ensure compatibility with the structural design of the building and county-approved building plans.
  4. Please refer to the Truss Plan Cover Sheet for other design requirements.
Manufactured Wood Joist

Requirements for Manufactured Wood Joist and Laminated Beams

An engineered system of manufactured wood beams/joists comprised of sawn or laminated lumber flanges and a plywood web. Examples: TJI by Weyerhaeuser, and GP-Lam LVL by Georgia Pacific, and LPI by Louisiana Pacific. These products are required to have an approved research/evaluation report and must be installed in accordance with that report.

  1. The layout, size, series number and manufacturer must be shown on the structural framing plans. Most changes from approved plans must be resubmitted for review. (This is not a walk-thru process.) Minor deviations may be approved by the field inspector.
  2. Drawings for these products are not required to be sealed unless members have been modified or damaged.

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