PAC International RSIC-SI-X 1.5 CRC
The RSIC-SI-X 1.5 CRC is a ceiling-only isolation clip used at the intersection of a 1-1/2 x 1/2 in, minimum 16 ga cold-rolled channel (CRC) above and a 7/8 in, 25 ga hemmed-edge drywall furring channel below. Its top clip snaps onto the CRC and is screwed tight, so the hanger wires and any vertical strut can stay hard-connected to the structure while the spring-and-rubber isolator decouples the lower furring channel and gypsum ceiling at every specified crossing. It ships pre-assembled and pre-calibrated, and it is not adjustable.
- Attaches to the cold-rolled channel, not the structure: The top clip snaps onto the 1-1/2 x 1/2 in, minimum 16 ga CRC and is screwed tight to it. There is no generic wood, steel or concrete fastener schedule for this clip — the CRC and its wires and strut are what connect to the structure.
- Spring and rubber in one calibrated unit: Each clip combines a coil spring with a rubber isolator, shipped pre-assembled and pre-calibrated. Total deflection is 0.5 in and the clip is not adjustable in the field.
- 16 x 48 in maximum layout: Clips sit at a maximum of 16 in o.c. along the crossing grid, with CRC framing at a maximum of 48 in o.c. That grid is the same for one or two layers of 5/8 in gypsum board.
- Colour-coded spring capacities: White 7 lb for edge, corner and infill where additional support is needed; Blue 13 lb for field and edge; Red 26 lb primarily for the field. The final colour schedule follows the project submittal.
- A shallow CRC alternative — not a long-span product: Nominal minimum cavity is 3-1/2 in with no maximum. For heavier systems PAC directs you to increase the number of isolators and channel, not to overload a spring.
Contact for pricing
Special-order item. We confirm current pricing, lead time (typically 3–10 business days, longer for custom sizes), and the material, size and finish options available — plus supply-only vs. professional-install pricing. Nothing is charged until you approve the estimate.
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RSIC-SI-X 1.5 CRC Specifications
- Use on ceilings
- Yes
- Use on walls
- No
- Type
- Spring and rubber isolation clip at the CRC / furring-channel intersection
- Upper connection
- Top clip snaps onto 1-1/2 x 1/2 in, minimum 16 ga cold-rolled channel and is screwed tight to it
- Lower connection
- 7/8 in, minimum 25 ga hemmed-edge drywall furring channel snaps into the lower part
- Isolation
- Spring isolation: yes · Rubber isolation: yes · Double deflection: yes
- Total deflection
- 0.5 in (family summary). The detailed capacity schedule states design load at 3/8 in deflection from free height — a different reference condition
- Acoustical design load
- White 7 lb · Blue 13 lb · Red 26 lb per isolator (detailed schedule)
- Structural limit
- Do not exceed 36 lb pull and shear per clip — a structural limit, not an acoustic rating
- Maximum layout
- 16 x 48 in o.c., the same for one or two layers of 5/8 in gypsum board
- Rough density
- About 1 clip per 5.33 sq ft at the maximum grid — a sanity check only
- Adjustable
- No — shipped pre-assembled and pre-calibrated
- Cavity
- Minimum 3-1/2 in nominal · no maximum
- Temperature
- Interior use only, 40–100 °F (4.4–37.8 °C)
- Construction
- New construction and retrofit
- Furring channel splices
- Minimum 6 in overlap at mid span between clips — never on a clip — with two 7/16 in framing screws or double-wrapped 18 ga tie wire
Making the connection
- 1 — Structure and anchors
- Approved structure with anchors by others, suited to the substrate and the load at each hanger point
- 2 — Hanger wires and vertical strut
- Hard-connected to the structure and to the suspended CRC — these stay rigid; the isolation happens at the clip below them
- 3 — Cold-rolled channel (CRC)
- 1-1/2 in wide x 1/2 in deep, minimum 16 ga, meeting or exceeding SSMA minimums
- 4 — RSIC-SI-X 1.5 CRC clip
- Top clip snapped onto the CRC and screwed tight; spring and rubber isolator inside
- 5 — Drywall furring channel
- 7/8 in deep, minimum 25 ga with hemmed edge, 1-1/4 in top and minimum 2-1/2 in bottom width, snapped into the clip's lower part
- 6 — Gypsum board
- Installed perpendicular to the furring channel with a minimum 1/4 in perimeter gap sealed with acoustical caulk
RSIC-SI-X 1.5 CRC Preliminary Ceiling Estimate
Built for ceilings. One clip goes at every specified crossing of the cold-rolled channel above and the 7/8 in furring channel below, so the count is CRC runs multiplied by clip positions. PAC's maximum layout is 16 x 48 in o.c., and it is the same for one or two layers of 5/8 in gypsum board.
- White — 7 lb
- Edge, corner and infill where additional support is needed
- Blue — 13 lb
- Field and edge
- Red — 26 lb
- Primarily field
Colours are pre-calibrated and are distributed across the ceiling — field, edge, corner and infill positions each carry a different tributary load, so the final colour schedule follows the PAC or project submittal rather than one colour everywhere. The 26 lb rating is the design load at 3/8 in deflection from free height; the family summary's 0.5 in figure is total deflection, a different reference condition.
Source note: PAC's submittal front page summarises the range as 7–25 lb, while the detailed capacity schedule and the spec guide's product limitations both list 7 / 13 / 26 lb. The detailed schedule is used here. Separately, the spec guide's "do not exceed 36 lb pull and shear" is a structural limit — never treat it as an allowable acoustic load. Both the spring rating and the structural limit must be satisfied.
How RSIC-SI-X 1.5 CRC compares
| Model | Use | Upper connection | Lower channel | Maximum layout |
|---|---|---|---|---|
| RSIC-SI-X 1.5 CRCthis | Ceilings only | Snaps and screws onto 1-1/2 x 1/2 in, min. 16 ga cold-rolled channel | 7/8 in, min. 25 ga hemmed-edge furring channel | 16 x 48 in o.c. (1 or 2 layers of 5/8 in gypsum) |
| RSIC-SI-X | Per its own listing | Per the RSIC-SI-X installation guide | 7/8 in furring channel | Per its own guide |
| RSIC-1 | Walls and ceilings per its own listing | Fastened to the framing member | 7/8 in furring channel | Per the RSIC-1 installation guide |
