Construction, Materials, and Specifications
Construction, Materials, and Specifications
This domain tests how finishes and assemblies are selected, detailed, and written into enforceable documents. Expect questions on CSI MasterFormat organization, three-part specifications, performance versus prescriptive language, submittals, fire-rated assemblies, and durability/maintenance.
Core rules
- MasterFormat organizes work by division: 09 Finishes (gypsum board, tile, flooring, paint), 12 Furnishings (casework, window treatments). Specifications are usually three-part: Part 1 General, Part 2 Products, Part 3 Execution.
- Prescriptive specs name products and methods; performance specs state results (e.g., abrasion resistance, VOC, fire rating). Performance specs need test methods and acceptance criteria.
- Submittals include product data, shop drawings, samples, mockups, and certificates. Review for conformance, not design completion.
- Fire-rated assemblies must match a tested listing (e.g., UL): 5/8 in Type X gypsum on steel studs is common for 1-hour partitions, but the full assembly-studs, fasteners, joints, penetrations-matters.
- Finish selection balances slip resistance (DCOF), cleanability, VOC, moisture, and life cycle.
Worked example
Specify a 1-hour corridor partition. Choose a listed UL assembly: 3-5/8 in steel studs at 16 in o.c., one layer 5/8 in Type X gypsum each side, joints staggered, all penetrations firestopped. Reasoning: the rating comes from the tested assembly, not from “5/8 Type X” alone. The spec must reference the listing, fastener schedule, and penetration detailing; substituting 1/2 in board would void the rating.
Traps
- Writing “or equal” without measurable criteria.
- Confusing flame spread with smoke developed; both are reported.
- Omitting substrate, mockup, or mockup approval requirements.
- Specifying a product without coordinating the assembly, trim, or adjacent finishes.