PAC International RSIC-SI-WHI
The RSIC-SI-WHI is a ceiling-only, factory-calibrated spring hanger that mounts to the side of overhead framing. Hanger wire connects its lower loop to a 16-gauge CRC carrier system or an approved drywall grid, isolating the suspended gypsum ceiling with approximately 1 inch of total spring travel. PAC lists it for ceilings, so it is best kept to ceiling work — a wall calls for a wall-rated system instead.
- Side-mounted to the framing: The bracket screws direct to the side of the joist. PAC's 2025 guide illustrates wood or steel framing, with a minimum 20 ga (0.030 in) steel joist; any other overhead condition needs a project-approved detail.
- Hanger wire below, not hat channel: Hanger wire ties to the bottom loop and carries the 1.5 in 16 ga CRC carrier or an approved drywall grid. Nothing snaps onto this hanger and no furring channel fastens to it.
- Shipped assembled and calibrated: Each hanger arrives pre-assembled and pre-calibrated. Do not rotate the spring assembly separately from its bracket — PAC warns that this can change the factory calibration.
- About 1 in of spring travel: Total deflection is 1 in with double deflection of +/- 1/2 in, and PAC's guide says the finished elevation sits about 1/2 in below the preset height once the gypsum is up. Mount the system to allow for that settlement.
- Colour-calibrated springs: The 2025 guide prints Silver 80, Red 40, Green 30, Blue 20, White 10 and Yellow 5 lb. Each position takes the spring calibrated for the weight it actually carries, so mixed colours across one ceiling are normal.
Online orders up to 4,999 pieces. For anything larger, call (415) 864-4440 and we'll price the project with you.
Volume pricing
$44.95 per clip. Order 250+ clips and pay $44.65 per clip — an extra $0.30 off per clip for each additional 250 clips, down to a $42.24 per clip floor.
Discounts apply automatically in the cart and count boxes and cases toward the total.
RSIC-SI-WHI Specifications
- Use on ceilings
- Yes
- Use on walls
- No
- Type
- Pre-assembled, pre-calibrated coil-spring hanger, side-mounted to framing
- Lower connection
- Hanger wire tied to the bottom loop — it can isolate hanger wire or pencil rod
- Supports
- 1.5 in 16 ga CRC carrier channel (1/2 x 1.5 x 1/2 in, SSMA 150U050-54) or an approved drywall grid
- Structure
- Side of wood framing, or steel joist of minimum 20 ga (0.030 in) thickness; any other overhead condition needs a project-approved detail
- Total deflection
- 1 in
- Double deflection
- Yes (+/- 1/2 in)
- Settlement at full load
- Finished elevation lands about 1/2 in below the preset height
- Pre-calibrated / pre-assembled
- Yes — do not rotate the spring separately from the bracket
- Adjustment limit
- Wire length
- Maximum spacing
- 48 in o.c. with cold rolled channel
- Perimeter support
- The first drywall support must be less than 8 in from the wall
- Spring colours (2025 guide)
- Silver 80 · Red 40 · Green 30 · Blue 20 · White 10 · Yellow 5 lb
- Published load range
- PAC's sources disagree — see the load-availability note below before specifying
- Construction
- New construction
- Drawing dimensions
- About 3 1/2 in wide, 10 in free height and 9 3/4 in loaded height (+/- 1/16 in)
Making the connection
- 1 — Structure
- Side of a wood joist, or a steel joist of minimum 20 ga (0.030 in)
- 2 — Fasteners
- Wood: minimum #8 x 1-5/8 in coarse thread (PAC recommends #10 or #12 x 1-5/8 in hex head). Steel: minimum #8 x 1 in fine thread (PAC recommends #10 or #12 x 1 in hex head)
- 3 — RSIC-SI-WHI
- The calibrated spring hanger, mounted so the ceiling can settle about 1/2 in under load
- 4 — Hanger wire
- Tied to the bottom loop, sized per the wire manufacturer for the load at that position
- 5 — Carrier
- 1.5 in 16 ga CRC at 48 in o.c. in PAC's sample, or an approved drywall grid to its own manufacturer's requirements
- 6 — Furring channel
- Where the CRC design is used: 7/8 in drywall furring channel crossing the carriers, minimum 25 ga hemmed edge or 20 ga standard, 24 in o.c. in PAC's sample
- 7 — Gypsum
- Attaches to the furring channel or grid, with a 1/8 to 1/4 in perimeter gap sealed with acoustical sealant
RSIC-SI-WHI Preliminary Estimate
Built for ceilings — a resilient wall calls for a wall-rated system instead. Quantity and spring calibration are two separate checks: the plotted grid sets how many hangers you need, and the weight each position actually carries sets which colour goes there.
PAC's own worked example counts the gypsum only: two layers of 5/8 in Fire Code C at 2.5 lb per sq ft per layer is 5 lb per sq ft, which is 40 lb on a 4 x 2 ft tributary area and 80 lb on a 4 x 4 ft one. That example does not automatically include the CRC carriers, drywall grid, furring channel, insulation or anything else the ceiling permanently carries, so add those to the figure you enter here. Focused loads — projectors, ductwork, curtains, heavy fixtures — are never carried by this ceiling; they need separately engineered supports.
That division is only the nominal maximum-grid check. The plotted count is what you order.
Mixed colours are normal: PAC places Silver 80 lb in the field, Red 40 lb and Green 30 lb in the field and perimeter, Blue 20 lb at field, perimeter and edge, White 10 lb at edges, corners and infill, and Yellow 5 lb at edges and corners. Never order the heaviest spring everywhere.
How RSIC-SI-WHI compares
| Model | Type | Attaches to | Lower connection | Movement | Load selection |
|---|---|---|---|---|---|
| RSIC-SI-WHIthis | Pre-calibrated coil-spring hanger | Side of wood or minimum 20 ga steel framing | Hanger wire to a 1.5 in 16 ga CRC carrier or approved drywall grid | 1 in total deflection · about 1/2 in settlement at load | Calibrated spring colour per position |
| RSIC-WHI | Rubber wire-insert isolator | Nothing — it sits inline in the hanger wire | Lower hanger wire to a drywall grid or CRC grid | Up to 1/4 in (6 mm) deflection | Six versions with 15–220 lb working ranges |
| RSIC-SI-CRC EZ | Adjustable spring hanger | Overhead structure per its own detail | A 1.5 in 16 ga CRC carrier directly on the hanger — no wire | Calibrated spring travel per its own specification | Calibrated spring colour per position |
| RSIC-SI-CRC2 LP | Low-profile spring hanger | Concrete, with a drop-in anchor | Two parallel CRC carriers directly on the hanger | Low-profile spring travel per its own specification | Calibrated spring colour per position |
| RSIC-SI-X ADM family | Adjustable direct spring mount | Concrete, wood or steel, direct or via a mini drop-in anchor | One 7/8 in furring channel directly in the lower clip — no wire, no CRC | About 3/8 in deflection | Red 26 · Blue 13 · White 7 lb |
