PAC International RSIC-SI-FF-BRW
The direct-mount RSIC-SI-FF-BRW is a ceiling-only full-frame spring-and-rubber isolator. Its upper bracket fastens directly to approved non-isolated overhead structure with project-approved anchors by others, and a minimum 12 ga annealed galvanized hanger wire drops from its lower eye nut to a manufacturer-approved suspended drywall grid. PAC lists it for ceilings, so it is best kept to ceiling work — a wall calls for a wall-rated system instead.
- BRW is the direct-mount version: PAC defines BRW functionally: the direct-mount full-frame spring-and-rubber ceiling isolator that holds wire below for drywall grid ceiling systems. It is not an acronym for "beam-to-wood", and it is not mounted on hanger wire above.
- Direct mount above, wire to grid below: Approved non-isolated overhead structure or substrate → project-approved fastener or anchor by others → BRW upper mounting bracket → rubber element and full-frame spring → lower eye nut → minimum 12 ga annealed galvanized hanger wire → approved suspended drywall grid → gypsum ceiling.
- No EZ clip, no CRC, no direct hat channel: Nothing screws to this isolator below: it holds wire. 7/8 in hat/furring channel, 1-1/2 in cold rolled channel and wood members do not attach 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 — there is no integral centre-screw adjustment as on the EZ versions. Final ceiling elevation is set by the lower hanger-wire ties and by levelling the grid.
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-BRW Specifications
- Use on ceilings
- Yes
- Use on walls
- No
- Type
- Full-frame spring and rubber ceiling isolator, shipped pre-assembled and pre-calibrated
- Upper connection
- Direct mount — upper bracket fastened to approved non-isolated structure with project-approved anchors/fasteners by others
- 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, not cold rolled channel, not a wood member
- 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 selection table; the spring compresses roughly 1/2 to 1 in as board load is added)
- 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 centre-screw adjustment; 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 fasteners/anchors by others approved for the substrate and verified for pull-out, shear and the actual load at each position
- 2 — RSIC-SI-FF-BRW bracket
- The upper mounting bracket fastens directly to that structure — there is no hanger wire above this isolator
- 3 — Isolator
- Rubber element plus the full-frame spring inside the steel frame, shipped pre-assembled and pre-calibrated; do not rotate or separate the calibrated frame
- 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 the required perimeter isolation (RSIC Perimeter Tape or an approved detail) and a 1/4 in gap sealed with resilient non-hardening acoustical sealant
RSIC-SI-FF-BRW 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. The BRW mounts directly to approved non-isolated overhead structure with project-approved fasteners or anchors by others, so every plotted position also has to land on structure with verified pull-out and shear capacity.
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-BRW compares
| Model | Use | Upper connection | Lower connection | Adjustable |
|---|---|---|---|---|
| RSIC-SI-FF-BRWthis | Ceilings only | Direct-mounted bracket to approved structure | Hanger wire to suspended drywall grid | No |
| RSIC-SI-FF-WRW | Ceilings only | Wire hung (min 12 ga wire) | Hanger wire to suspended drywall grid | No |
| RSIC-SI-FF-BRC EZ | Ceilings only | Direct-mounted bracket to approved structure | EZ clip receiving 1-1/2 in 16 ga cold rolled channel | Yes — centre screw |
| 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 |
