Structural design documents and specifications issued for construction for all or a portion of the work shall be based upon a completed design for the scope of work represented and provide the following information, as applicable, to define the work to be fabricated and erected:
- (a) Information as required by the applicable building code.
- (b) Information as required in ANSI/AISC 360 Section A4 and ANSI/AISC 341 Section A4.
- (c) Shop painting and surface preparation requirements. Specific members or portions thereof that are to be left unpainted shall be identified. When shop painting is required, the paint system requirements shall be specified, including (1) the identification of specific members or portions thereof to be painted; (2) the surface preparation that is required for these members; (3) the paint specifications and manufacturer's product identification, including color requirements, if any, that are required for these members; (4) the minimum dry-film shop-coat thickness that is required for these members; (5) identification of compatible shop applied and field applied paint systems in multi-coat application; and (6) the party or subcontractor responsible for field touch-up including repair of shipping and handling damage after shop application(s). The absence of the foregoing information for bidding purposes shall result in provisions for related work to be absent from the bid. When the actual information becomes available subsequent to bidding, the contract price and schedule shall be adjusted equitably in accordance with Sections 9.4 and 9.5.
- (d) Designation of members to which the requirements of Section 10 for AESS apply.
- (e) Where leveling plates are to be furnished, their locations and required thickness and sizes.
The structural design documents, specifications, and addenda shall be numbered and dated for the purposes of identification. Three-dimensional digital models shall contain a unique identifier.
Commentary
In the interests of public safety, structural design documents and specifications issued for construction for all or a portion of the work must be based upon a completed design for the scope of work represented. The items listed should include contractual requirements addressed in the Code.
The engineer of record should also consider all or a portion of the specified information to be shown on structural design documents and specifications used for ordering structural steel or placing mill orders. Changes made after ordering structural steel or placing mill orders will likely lead to change orders if not properly coordinated and addressed in a timely manner prior to construction. Revisions to the design documents and specifications are covered under Section 3.6.
In some cases, the owner can benefit when reasonable latitude is allowed in the contract documents for alternatives that can reduce costs without compromising quality. However, critical requirements that are necessary to protect the owner’s interests that affect the integrity of the structure or that are necessary for the fabricator or erector to proceed with their work must be included in the contract documents issued for construction. A list of important information and requirements are provided to supplement items required for documents issued for construction in ANSI/AISC 360. This list should be modified or supplemented, if necessary, to suit actual project conditions.
Some members or portions thereof may be required to be left unpainted, such as those that will be in contact and acting compositely with concrete, those areas near or within connections, or those that will receive spray-applied fire protection materials. The contract documents should clearly indicate where the change in finishes start and stop so there is no confusion between all parties.
This section refers directly to “painting”. The contract documents should clearly state its applicability to other coatings, such as intumescent paint, i.e., fireproofing.
This section applies to shop painting. If project requirements are to include field painting, these requirements must be explicitly identified in the contract documents; see Section 7.17. SSPC Painting Manual, Volumes 1 and 2, 5th Edition is a useful reference for coatings and painting.
The surface preparation used for a paint system must carefully consider the intended use of the steel (i.e., interior, exterior, AESS, etc.) as it affects both the aesthetics of surface irregularities and durability against paint failure. For most interior commercial applications, durability is not normally a concern as discussed in the ANSI/AISC 360, Commentary Section M3. However, if surface irregularities from mill scale, whether coated or not, or accumulated rust would be visually objectionable, then an SP6 preparation should be considered because a less aggressive preparation will not remove all tightly adhered mill scale and may not remove all rust from material stored outside. A mockup can be useful to demonstrate the impact of an SP6 preparation on surface irregularities.
For interior corrosive environments and exterior applications, an SP6 preparation is generally regarded as the minimum level of preparation necessary to provide adequate durability against paint failure. However, for other types of coatings (e.g., hot dip galvanizing), that may not be the case.