Materials, Finishes, and Specifications
What this domain tests
This domain tests finish selection, fire performance, substrate compatibility, and specification writing. You should be able to choose a finish for a location and defend it with a test standard, then write an enforceable specification section.
Core rules and concepts
- ASTM E84 classifies flame spread and smoke developed: Class A is 0-25 flame spread, Class B 26-75, and Class C 76-200. IBC Chapter 8 sets where each class is required; exit enclosures and corridors are the most restrictive.
- Finish schedules record manufacturer, product, color, finish, adhesive, and substrate. Specifications use CSI MasterFormat divisions: 09 finishes, 12 furnishings, and 10 specialties.
- A specification section follows Part 1 General, Part 2 Products, Part 3 Execution. Performance specs state results; prescriptive specs name materials and methods; proprietary specs name a product and require substitutions to be approved.
- Accessibility affects finishes: carpet pile in accessible routes is limited and must be firmly attached; transitions must be secure and change no more than 1/4 in vertically.
Worked example
A 5,000 sf exit access corridor needs a wall finish. Because the corridor serves egress, specify a Class A wall covering tested to ASTM E84 with a smoke-developed index within the code limit. Confirm the adhesive and substrate are compatible, and require a mockup so the installer proves seam and corner details before full installation.
Traps
Selecting on color and durability alone; assuming a finish rating applies to the assembly; omitting substrate and adhesive; and accepting an unapproved substitution without a written change.