6.3 Preliminary FF&E: Identifying Finish Materials

Finish Selection: A Multi-Criteria Decision

Every finish selection is a compromise among competing criteria. The designer must satisfy code (will it pass plan review?), performance (will it wear?), sustainability (does it off-gas?), aesthetics (does it support the design concept?), budget (can the client afford it?), and lead time (will it arrive before move-in?). No single criterion wins — the designer weighs all six for every specification.

Code and Performance Standards

Flame Spread: ASTM E84

The ASTM E84 Steiner Tunnel test is the primary U.S. standard for interior finish fire performance. It measures two values: the flame spread index (FSI) — how fast flame travels across the surface — and the smoke-developed index (SDI) — total smoke released. Under IBC §803.1.2, materials are classified:

Critical rule: both FSI and SDI must be within range. A material with FSI 20 (Class A range) but SDI 500 fails Class A. Designers must verify both values on the test report.

Where Each Class Is Required

IBC Table 803.13 sets the required class by occupancy group and location (exit, corridor, room), with separate columns for sprinklered and non-sprinklered buildings. For example, a non-sprinklered Group B corridor requires Class B; a non-sprinklered Group B room requires only Class C. Sprinkler protection generally allows a one-class reduction — but not for Group I-3 (detention) corridors or Group H (hazardous) corridors.

Slip Resistance

The ADA Standards (Section 302.1) require accessible floor surfaces to be stable, firm, and slip resistant. The standard does not mandate a specific coefficient of friction — the often-cited 0.6 value for level surfaces (and 0.8 for ramps) comes from advisory material in the ADAAG appendix, not the enforceable standard. Compliance is achieved by specifying surfaces that minimize slipperiness under expected conditions. Areas likely to be wet — entrances, restrooms, kitchens — should have a higher level of slip resistance.

Other Floor Surface Requirements (ADA §302)

• Carpet: maximum pile height 1/2 inch, firm backing, securely attached
• Openings (gratings): no opening that allows passage of a 1/2-inch sphere; elongated openings oriented perpendicular to travel direction
• Level changes: up to 1/4 inch vertical permitted; 1/4 to 1/2 inch must be beveled (slope no steeper than 1:2); over 1/2 inch requires a ramp

Sustainability Certifications

Interior finishes can emit volatile organic compounds (VOCs) and other pollutants after installation. Several third-party certifications verify low emissions:

VOC Regulatory Limits

• CARB (California Air Resources Board) sets the strictest U.S. VOC limits for paints, adhesives, sealants — widely adopted as de facto national standards
• EPA TSCA Title VI (effective 2018) limits formaldehyde emissions from composite wood products (particleboard, MDF, plywood)
• LEED v4.1 EQ Credit awards points for low-emitting materials meeting CA 01350 or GREENGUARD thresholds

Material Applications: Where Each Material Is Appropriate

Color Theory in Finish Selection

Color communicates brand, defines space, affects mood, and influences perceived scale. Key principles:

• Hue, value, and chroma are the three dimensions of color. Value (lightness) has the strongest spatial effect — light colors make spaces feel larger; dark colors compress them.
• Color temperature (warm vs. cool) affects perceived comfort. Warm tones benefit north-facing rooms that lack direct sunlight; cool tones suit hot, south-facing spaces.
• Contrast for accessibility: ADA and A117.1 recommend light-on-dark contrast for elements like door frames, signage, and transitions to assist low-vision users. A contrast ratio of at least 70 percent is commonly cited.
• Metamerism: two finishes that match under one light source may not match under another. Always evaluate samples under the project's specified lighting.

Budget and Lead Time

Finish selection must respect the project budget and schedule. A material that is perfect aesthetically but costs three times the allowance or has a 16-week lead time will delay occupancy. Designers should:

• Verify stock availability before specifying custom or imported materials
• Build alternates into the specification so the contractor can substitute if the first choice is unavailable
• Track lead times from the start — a 12-week lead time means the order must be placed 12 weeks before installation
• Balance first cost against life-cycle cost — a higher first cost may be justified by lower maintenance or longer service life

Sourcing and Reference Standards

Materials are sourced through manufacturers' representatives, showrooms, distributors, and direct from manufacturers. The designer should maintain a finish library with physical samples and current technical data sheets. Key reference standards to verify on every specification:

• ASTM E84 — flame spread and smoke developed
• ASTM D2394 — carpet wear testing
• ASTM C627 — ceramic tile installation (Robinson test)
• ANSI A138.1 — sustainable flooring (Tile Council)
• ISO 14001 — environmental management system (manufacturer-level)