PAC International RSIC-1 EXT04
The RSIC-1 EXT04 is a 4" extension isolator clip that decouples drywall from framing while bypassing obstructions and maintaining ceiling height. Engineered for ceilings or walls, it installs quickly with 7/8" hat channel to reduce structure-borne noise and boost STC.
- Consistent Channel Alignment: Precise positioning of furring channels across uneven surfaces so drywall sits flat without compromising isolation.
- 4" Extension Design: Built-in 4"-long extension bracket offsets the clip from framing to navigate mechanical obstructions or misaligned studs.
- Reliable Vibration Control: Resilient rubber isolator absorbs and deflects structure-borne vibration for consistent STC gains.
- Proven Acoustic Performance: Used in laboratory-tested and UL-approved assembly listings.
Online orders up to 4,999 pieces. For anything larger, call (415) 864-4440 and we'll price the project with you.
Volume pricing
$8.50 per clip. Order 250+ clips and pay $8.25 per clip — an extra $0.25 off per clip for each additional 250 clips, down to a $7.30 per clip floor.
Discounts apply automatically in the cart and count boxes and cases toward the total.
RSIC-1 EXT04 Specifications
- Width
- 1 9/16 in
- Height
- 5 5/8 in
- Depth
- 3 in
- Weight
- 0.38 lb
- Max spacing
- 48 in on center
- Max load
- 36 lb
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-1 EXT04 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 typical 24" × 48" clip pattern. Add a 10% coverage buffer for cuts and re-work.
STC Gauge
Compare how the RSIC-1 EXT04 performs across assembly tiers. Select an assembly below to see the resulting STC score.
RSIC-1 EXT04 + 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-1 EXT04 compares
Applicable Assemblies
See where the RSIC-1 EXT04 fits — from budget baseline to studio-grade isolation.
Best — RSIC-1 EXT04 + Double Drywall + Green Glue + Insulation
Structure · Rockwool insulation · RSIC-1 EXT04 + hat channel · 5/8" drywall · Green Glue · 5/8" drywall · acoustic sealant.
Better — RSIC-1 EXT04 + Double Drywall + Green Glue
Structure · Rockwool insulation · RSIC-1 EXT04 + hat channel · 5/8" drywall · Green Glue · 5/8" drywall.
Good — RSIC-1 EXT04 + Silent FX Drywall
Structure · RSIC-1 EXT04 + hat channel · Silent FX damped drywall · acoustic sealant.
