Communicate the design criteria from the Construction Design documents to the Truss Designer. Prepare the Truss Layout Plan, providing as a minimum the location assumed for each Truss based on the Truss Manufacturer’s interpretation of the Construction Design Document.
Submit to the Contractor the Truss Layout Plan, as may be required, and each Truss Design Drawing for review and approval.
Manufacture the Trusses in accordance with the final approved Truss Design Drawings using the quality criteria for Nail Plated Timber Trusses established by SANS 10243. Design, manufacture and Erection of Timber Roof Trusses.
Draw owners attention to need for roof inspection in terms of SANS 10400
TRUSS DESIGNER RESPONSIBILITIES
Prepare the Truss Design Drawings in conformance with the requirements set forth in the latest approved edition SANS 10243.
For each Truss Design Drawing, set forth as a minimum the following:-
Pitch or Height, span and spacing
Required bearing widths
Design loads as applicable:
Top chord live load;
Top chord dead load;
Bottom chord dead load;
Concentrated loads and their points of application.
Awareness of metal connector for unusual conditions of use.
Awareness of excessive reaction forces and directions.
Connector plate type, size and the dimensioned location of each metal connector plate except where symmetrically located relative to the joint interface.
Timber size and grade for each member.
Connection requirements for:
Truss to girder;
Multiple truss connections;
Site splices approval by system engineers.
Required truss and bracing detailed drawing to the site for installation and erection
SCOPE AND DEFINITIONS
This standard defines the design responsibilities of the individuals and organizations involved in the preparation, submittal, review and approval of each Truss Design Drawing and Truss Layout Plan associated with the use of nail plate timber trusses.
These guidelines are presented as industry standard practice. The guidelines are not intended to preclude alternate provisions as agreed upon by the parties involved.
The following definitions shall apply:
“Architect” shall mean the architect responsible for the architectural design of the structure and who produces the architectural drawings included in the Construction Design Documents.
“Construction Design Documents” are the architectural drawings, structural drawings, mechanical drawings, electrical drawings, and any other drawings,specifications, and addenda that set forth the overall design of the structure.
“Contractor” shall mean the individual or organization responsible for the field storage, handling, and installation of trusses including, but not limited to, temporary bracing, permanent bracing, anchorage, connections and field assembly. The term “Contractor” shall include those subcontractors to perform all or a portion of the storage, handling, and installation of the trusses.
“Engineer” shall mean the registered professional engineer responsible for the structural design of the structure and who produces the structural drawings included in the Construction Design Documents.
“Owner” shall mean the individual or organization for whom the structure is designed.
“Truss” is an individual nail plated timber structural component manufactured by the Truss Manufacturer.
“Truss Designer” is the design professional, individual or organization (system engineers), having responsibility for the design of nail plated timber trusses. This responsibility shall be in accordance with the statutes and regulations governing the professional registration and certification of engineers, but hereinafter will be referred to as Truss Designer.
“Truss Design Drawing” shall mean the graphic depiction of an individual Truss prepared by the Truss Designer.
“Truss Manufacturer” shall mean an individual or organization regularly engaged in the manufacturing of Trusses.
“Truss Layout Plan” is the drawing identifying the location assumed for each Truss based on the Truss Designer’s interpretation of the Construction Design Documents.
Directly or through its representatives, which may include the Contractor and/ or Building Designer:
Review and approve each Truss Design Drawing;
Review and approve the Truss Layout Plan;
Resolve and approve all design issues arising out of the preparation of each Truss Design Drawing and Truss Layout Plan;
CO-ordinate the return of each approved Truss Design Drawing and Truss Layout Plan to the Truss Manufacturer prior to truss manufacturing;
Ensure compliance with SANS 10400 Registration A19.
Provide to the Truss Manufacturer the Construction Design Documents and all revisions and supplements thereto.
Review and approve the Truss Layout Plan and each Truss Design Drawing for conformance with the requirements and intent of the Construction Design Documents, and the effect of the Truss Layout Plan and each Truss Design Drawing on other trades involved in the construction of the structure and the effect of the other trades on the Trusses.
Co-ordinate the review, approval and return of each Truss Design Drawing and the Truss Layout Plan by the Owner and Building Designer.
Provide the approved Truss Design Drawings, approved Truss Layout Plans, and any supplemental information provided by the Truss Manufacturer to the individual or organization responsible for the installation of the Trusses.
Comply with the field storage, handling, installation, permanent bracing, anchorage, connections and field assembly requirements of the Construction Design Documents.
Draw owners attention to need for roof inspection in terms of SANS 10400 Registration A19.
MANUFACTURE OF NAIL PLATED TRUSSES
Refer to Code of Practice SANS 10243.
In conjunction with the code of practice SANS 10243, it will be necessary for the candidate to be familiar with the following Specific Outcomes for the Manufacture of Nail-plated Timber Roof Trusses.
Identify the Material and Tools required for roof truss manufacturing.
Demonstrate knowledge of the general functions of the equipment used for the manufacture of timber roof trusses.
Demonstrate an understanding of the timber roof truss production flow.
Demonstrate knowledge of the general concept of raw material and product quality.
Understand and interpret the computer generated design cutting bills.
Understand the calibration and setting up of the cutting equipment.
Understand and be able to set up the assembly jig for nail plated timber roof trusses.
Inspect and quality-assure timber roof trusses.
The assessment of the candidate on this production associated section will be carried out in-house by a system representative or by a responsible person in the organization and credit will be given based on a satisfactory report signed by the assessor.