Resilmount A48R
The Resilmount A48R offers premium sound isolation by separating furring channels from structural framing — effectively reducing vibration and airborne noise. Purpose-built for corners, soffits, and transitions in walls and ceilings, it breaks rigid acoustic short-circuits, boosts STC/IIC performance, and delivers lasting comfort across residential and commercial builds.
- Targeted Flanking Control: Right-angle resilient bracket isolates corners, soffits, and transitions — breaks the rigid short-circuits that carry vibration and lifts overall STC/IIC ratings.
- Compact & Easy Installation: Low-profile form fastens to wood or light-gauge steel and fits tight retrofits, offsets, and soffit framing for quick, repeatable installs.
- Code-Friendly & Durable: Engineered thermoplastic isolator maintains separation under load and integrates into rated assemblies when detailed per listing and project engineering.
- Budget-Friendly Upgrade: A small, inexpensive component that prevents costly acoustic short-circuits — significant isolation gains across new builds or retrofits.
Online orders up to 4,999 pieces. For anything larger, call (415) 864-4440 and we'll price the project with you.
A48R Specifications
- Width
- 1 9/16 in (1.5625 in)
- Height
- 4 3/8 in (4.375 in)
- Depth
- 1 3/16 in (1.1875 in)
- Max spacing between clips
- 48 in on center
- Max load (dead weight)
- 48 lb
- Isolation element
- Thermoplastic rubber isolator
- Substrates
- Wood or light-gauge steel framing
- UL rating
- Compatible with UL-listed fire-rated assemblies
A48R fasteners
- Minimum bracket fastener
- #8 screws or masonry sleeve anchors
- Wood joists
- #8 × 2" coarse thread screws
- Steel joists
- #8 / #10 / #12 self-tapping at 1 5/8"
- Fire-rated assemblies
- Model A-300 washer required
- Not permitted
- Do not fasten with nails
A48R 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 the manufacturer's standard 48" × 48" o.c. layout. Tighten to 32" × 32" o.c. for heavier finishes, and add a 10% coverage buffer to cover cuts and re-work.
STC Gauge
Compare how the A48R performs across assembly tiers. Select an assembly below to see the resulting STC score.
A48R + channel system + MLV + double 5/8" drywall with Green Glue between layers, insulated stud wall.
- 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 A48R compares
| Model | Primary Use | Hat Channel | Typical Layout | Isolation Element |
|---|---|---|---|---|
| A48Rthis | Right-angle resilient bracket (corners, soffits, transitions) | N/A (direct right-angle) | Up to 48" × 48" o.c. | Thermoplastic rubber isolator |
| A237R | Resilient sound isolation clip | 7/8" or 1 1/2" | ≤24" o.c. hat · ≤48" o.c. clip spacing | Thermoplastic rubber sound cells |
| A237 | Rigid direct-fix furring bracket | 7/8" or 1 1/2" | ≤24" o.c. hat · ≤48" o.c. clip spacing | None (rigid mount) |
| A96R | Adjustable ceiling bracket (purlin / truss furring) | Standard furring channel | ≤24" o.c. hat · ≤48" o.c. clip spacing | Resilient rubber element |
Applicable Assemblies
See where the A48R fits — from budget baseline to studio-grade isolation.
Best — Clips + Insulation + MLV + Double Drywall + Green Glue
Stud wall · insulation · A48R + channel system · MLV · 5/8" drywall · Green Glue · 5/8" drywall · acoustic sealant.
Better — Clips + Double Drywall + Green Glue
Stud wall · insulation · A48R + channel system · 5/8" drywall · Green Glue · 5/8" drywall · acoustic sealant.
Good — Clips + Silent FX Drywall
Stud wall · insulation · A48R + channel system · Silent FX damped drywall · acoustic sealant.
