Flooring Selection
{{no_1}}
{{no_2}}
Deck-Slab Selection
Verco/Vulcraft Territories
{{In_4}} ≤
≤ {{In_6}}
{{Er_1}}
Ceiling Selection
{{no_3}}
{{no_4}}
STC & IIC Rating
Generic Rating Scale
| Generic STC Rating Scale |
| STC 20–30 — Very poor |
| Conversations are clearly understood through the partition. |
| Little privacy; everyday sounds transmit easily. |
| STC 30–40 — Poor |
| Normal speech is intelligible; loud speech is prominent. |
| Provides minimal separation between spaces. |
| STC 40–50 — Moderate |
| Normal speech is audible but not always intelligible. |
| Loud speech still noticeable but less intrusive. |
| Adequate for basic privacy needs. |
| STC 50–60 — Good |
| Loud speech is mostly inaudible. |
| Everyday sounds significantly reduced. |
| Meets typical expectations for residential comfort. |
| STC 60–70 — Very good |
| Most airborne noise is well-contained. |
| Suitable for higher-end living spaces, offices, and many commercial uses. |
| STC 70+ — Excellent |
| High-performance acoustic separation. |
| Speech and most airborne noise barely perceptible. |
| Used for studios, medical spaces, and environments requiring strong privacy. |
| Generic IIC Rating Scale |
| IIC 20–30 — Very poor |
| Every footstep, heel click, or dropped object is loud and intrusive. |
| Typical of hard surfaces with little impact isolation. |
| IIC 30–40 — Poor |
| Footsteps and impact noise are clearly heard and may be disruptive. |
| Basic or minimal impact noise control. |
| IIC 40–50 — Moderate |
| Everyday impact sounds (walking, light movement) are audible but less sharp. |
| Acceptable for non-sensitive spaces; borderline for dwellings. |
| IIC 50–60 — Good |
| Normal foot traffic becomes faint or barely noticeable. |
| Meets most building-code expectations for multi-family living. |
| Suitable for general residential comfort. |
| IIC 60–70 — Very good |
| Most impact noise is significantly softened or not heard. |
| Suitable for higher-end residential or offices where quiet is desired. |
| IIC 70+ — Excellent |
| High-performance isolation; footsteps are inaudible or extremely muted. |
| Used for premium comfort, studios, or sensitive environments. |