Commercial interior construction demands exact adherence to ASTM structural standards, UL fire-rated partition assemblies, and acoustic decibel attenuation specifications.
Drywall Finish Levels Explained (ASTM C840)
| Finish Level | Tape & Joint Compound Scope | Approved Commercial Application |
|---|---|---|
| Level 1 | Tape embedded in joint compound only | Above ceiling plenums, elevator shafts |
| Level 2 | Tape embedded + thin skim coat over fasteners | Garages, warehouse storage rooms |
| Level 3 | Tape + 2 coats compound over joints & fasteners | Heavy texture walls, back-of-house utility areas |
| Level 4 | Tape + 3 separate coats over joints & screws | Standard commercial office space with flat paint |
| Level 5 | Level 4 + full skim coat across entire gypsum board | High-end lobbies, spaces with critical glancing light |
Acoustic Ceiling Tile (ACT) Selection
Specify ceiling tiles with an NRC (Noise Reduction Coefficient) of 0.70 or higher and a CAC (Ceiling Attenuation Class) of 35 or higher in professional offices, conference rooms, and executive suites to prevent voice travel over partition headers.