PAC International RSIC-SI-FF-WRW
The RSIC-SI-FF-WRW is a ceiling-only, wire-hung full-frame spring-and-rubber isolator that holds wire below for a manufacturer-approved suspended drywall grid ceiling. Hanger wire carries it from the non-isolated structure above, and a second length of hanger wire drops from its lower eye nut to the grid. PAC lists it for ceilings, so it is best kept to ceiling work — a wall calls for a wall-rated system instead.
- WRW means wire hung, wire below: PAC's guide: "RSIC-SI-FF WRW is a wire hung spring and rubber isolation system that holds wire for use with Drywall Grid Ceiling Systems." The first W is the wire-hung upper connection and the final W is the lower hanger wire to the grid. It does not mean wood-to-wood.
- Wire above, wire below, grid underneath: Approved overhead structure or anchor by others → minimum 12 ga annealed galvanized hanger wire → upper eye nut through the rubber element of the full frame and spring → lower eye nut → minimum 12 ga lower hanger wire → approved suspended drywall grid → gypsum ceiling.
- No EZ clip and no direct hat channel: The WRW has no lower CRC clip and 7/8 in hat/furring channel does not fasten to it. Where the lower member is cold rolled channel, specify the correctly configured CRC variant instead.
- 10 to 80 lb, colour coded by capacity: White 10, Blue 20, Green 30, Red 40 and Silver 80 lb, each with a published 0.50 to 1.00 in nominal working deflection range in PAC's detailed selection table.
- Not field adjustable: PAC lists Adjustable: No — the isolator has no integral adjustment screw. Ceiling elevation is set by the hanger-wire ties and grid levelling, allowing for the spring to compress as the gypsum goes up.
Online orders up to 4,999 pieces. For anything larger, call (415) 864-4440 and we'll price the project with you.
Volume pricing
$51.95 per clip. Order 250+ clips and pay $51.45 per clip — an extra $0.50 off per clip for each additional 250 clips, down to a $44.95 per clip floor.
Discounts apply automatically in the cart and count boxes and cases toward the total.
RSIC-SI-FF-WRW Specifications
- Use on ceilings
- Yes
- Use on walls
- No
- Type
- Full-frame spring and rubber ceiling isolator, shipped fully assembled and calibrated
- Upper connection
- Wire hung — minimum 12 ga annealed galvanized hanger wire tied through the upper eye nut that passes through the rubber element
- Lower connection
- Minimum 12 ga annealed galvanized hanger wire tied to the lower eye nut and to the approved suspended drywall grid
- Lower system
- Manufacturer-approved suspended drywall grid — not 7/8 in hat/furring channel and not a CRC clip
- Acoustical design load
- 10 – 80 lb (White 10 · Blue 20 · Green 30 · Red 40 · Silver 80)
- Working deflection range
- 0.50 – 1.00 in (PAC's detailed WRW selection table)
- Family summary deflection
- 3 mm total / 1.5 mm double deflection — published separately from the table above; verify the project submittal with PAC
- Adjustable
- No — no integral adjustment screw; elevation is set by hanger-wire ties and grid levelling
- Cavity minimum
- 10 in
- Cavity maximum
- Unlimited
- Maximum spacing
- 48 in o.c. each way mid-room (16 sq ft per isolator maximum in the interior)
- Perimeter
- Isolators not more than 8 in from the isolated-ceiling edge, keeping at least 3 in of clearance
- Construction
- New construction and remodel
- Design basis
- Two layers of 5/8 in gypsum board
Making the connection
- 1 — Structure
- Non-isolated overhead structure or substrate, with anchors by others approved for the substrate, the shear and the actual load
- 2 — Upper hanger wire
- Minimum 12 ga annealed galvanized wire per local code, anchored to the non-isolated structure and tied through the upper eye nut
- 3 — RSIC-SI-FF-WRW
- The full-frame spring and rubber isolator: the upper eye nut passes through the rubber element, the spring sits in the steel frame, and a second eye nut hangs below
- 4 — Lower hanger wire
- Minimum 12 ga annealed galvanized wire tied to the lower eye nut and to the grid, set so the ceiling can lower as the springs compress under the board
- 5 — Drywall grid
- Manufacturer-approved suspended drywall grid, installed to the grid manufacturer's instructions and kept clear of walls, columns and any non-isolated component
- 6 — Gypsum
- Gypsum board on the grid, with a 1/8 to 1/4 in perimeter gap sealed with non-hardening acoustical caulk (fire and smoke rated where required)
RSIC-SI-FF-WRW Preliminary Estimate
Built for ceilings. Quantity and capacity are two separate checks: the plotted hanger layout sets how many isolators you need, and the dead load each position actually carries sets which calibrated capacity goes there.
Enter the complete ceiling dead load: the suspended drywall grid, every gypsum layer, damping compound and finishes, and anything the ceiling permanently carries. Two layers of 5/8 in board alone are roughly 5 lb per sq ft, which is about 80 lb on a full 4 x 4 ft field cell — the grid and finishes add to that. Where a position runs heavy, move to smaller tributary areas and closer hangers. Projectors, HVAC ducting, curtains and other unrelated heavy point loads are never carried by this ceiling; they need separately designed supports.
That division is only a nominal maximum-grid check, never the count you order. The plotted rows × columns come from the reflected ceiling and grid layout: perimeter isolators must sit no more than 8 in from the edge of the isolated ceiling while keeping at least 3 in of clearance, so real rooms usually need more isolators than the division suggests.
Mixed capacities are normal: edge and corner positions carry a fraction of a field position, so never order the heaviest isolator everywhere. PAC's detailed table gives a nominal working deflection of 0.50–1.00 in for every capacity, while the family summary sheet lists 3 mm total and 1.5 mm double deflection; those are not the same figure, so verify the project submittal with PAC or your design professional if the difference matters. Capacity colour and rubber colour are different labels — White 10 and Blue 20 use blue rubber, Green 30 brown, Red 40 green, Silver 80 red.
How RSIC-SI-FF-WRW compares
| Model | Use | Upper connection | Lower connection | Adjustable |
|---|---|---|---|---|
| RSIC-SI-FF-WRWthis | Ceilings only | Wire hung (min 12 ga wire) | Hanger wire to suspended drywall grid | No |
| RSIC-SI-FF-WRC EZ | Ceilings only | Wire hung (min 12 ga wire) | EZ clip receiving 1-1/2 in 16 ga cold rolled channel | Yes — centre screw |
| RSIC-SI-FF-BRW | Ceilings only | Direct-mounted top bracket | Hanger wire to suspended drywall grid | No |
