PAC International RSIC-SI-X
The RSIC-SI-X spring-isolated resilient sound clip is engineered to decouple drywall ceiling and wall assemblies from structural framing, significantly reducing structure-borne and airborne noise. Its integrated steel housing, elastomer interface, and pre-calibrated coil spring dissipate vibration energy while maintaining a low overall profile — ideal for homes, offices, and studios where headroom is limited.
- Multi-Wave Spring Isolator: Delivers superior low-frequency isolation by breaking the direct mechanical path that carries sound and structural vibration.
- Low-Profile Design: Achieves meaningful STC and IIC improvements while minimizing ceiling drop — ideal for retrofit projects and space-restricted builds.
- Durability & Long-Term Stability: Heavy-gauge steel with resilient elastomer components resists sagging, fatigue, and degradation over time.
- High-Performance Assembly Ready: Supports heavier ceiling builds including double drywall layers with damping compounds without compromising isolation.
Online orders up to 4,999 pieces. For anything larger, call (415) 864-4440 and we'll price the project with you.
RSIC-SI-X Specifications
- Width
- 1 1/4 in
- Height
- 2 1/4 in
- Depth
- 1 1/8 in
- Weight
- 0.12 lb
- Max spacing
- 48 in on-center
- Max load
- 7 lb / 13 lb / 26 lb (spring color coded)
Hat channel specs
- Gauge
- 25 gauge (hemmed edge)
- Depth
- 7/8 in
- Width — top
- 1 1/4 in
- Width — bottom
- 2 1/2 in
RSIC-SI-X Project Calculator
Enter your surface square footage. We'll return a clip, channel, and screw count for your project — calculations run on our servers so estimates stay accurate as our field data improves.
Adds MLV over Good for a denser limp-mass layer.
Estimates follow PAC's standard clip + hat-channel layout with 48" clip spacing and 24" channel spacing. A 10% coverage buffer is recommended.
STC Gauge
Compare how the RSIC-SI-X performs across assembly tiers. Select an assembly below to see the resulting STC score.
RSIC-SI-X + hat channel + double 5/8" drywall + Green Glue on insulated joists.
- STC 30-39: Loud speech clearly audible next room.
- STC 40-49: Loud speech muffled — normal residential wall.
- STC 50-59: Loud speech barely audible; suitable for offices & multi-family.
- STC 60+: Approaches studio-grade isolation.
How RSIC-SI-X compares
| Model | Primary Use | Isolation Element | Typical Layout | Notes |
|---|---|---|---|---|
| RSIC-SI-Xthis | Low-profile spring ceiling isolation | Coil spring + neoprene | ≤24" channel · ≤48" clip o.c. | Preserves headroom; strong IIC gains |
| RSIC-1 | General wall/ceiling decoupling | Molded rubber isolator | ≤24" · ≤48" | Popular all-around choice |
| RSIC-SI-X Low Profile | Ceiling isolation (min. drop) | Spring, low-profile | ≤24" · ≤48" | For tightest cavities |
Applicable Assemblies
See where the RSIC-SI-X fits — from budget baseline to studio-grade isolation.
Best — RSIC-SI-X + Double Drywall + Green Glue + Insulation
Joists · Rockwool insulation · RSIC-SI-X + hat channel · 5/8" drywall · Green Glue · 5/8" drywall · acoustic sealant.
Better — RSIC-SI-X + Double Drywall + Green Glue
Joists · Rockwool insulation · RSIC-SI-X + hat channel · 5/8" drywall · Green Glue · 5/8" drywall.
Good — RSIC-SI-X + Silent FX Drywall
Joists · Rockwool insulation · RSIC-SI-X + hat channel · Silent FX damped drywall · acoustic sealant.
