FM APPROVALS
Project ID: 3041526
Appendix B
FIRE STOP DESIGN 636
F Rating – 1 and 2 HR (see item 1)
T Rating – 0 and 1 HR (see item 1 and 3)
TFM Rating – 0 and 1 HR (see item 1 and 3)
- WALL ASSEMBLY. One or two hour fire rated gypsum wall assembly constructed with steel
channel studs.
A. Steel studs (not shown) are channel shaped, min 3-5/8 in. (92 mm) deep and 1-5/8 in. (41 mm)
wide with ½ in. (13 mm) folded back flanges. Fabricated from 20 MSG galvanized steel, spaced a
max of 16 in. (400 mm) on center. Additional framing members are to be installed to form a
rectangular box having dimensions which are a max ¼ in. (6 mm) greater than the width and
height of the firestop device frame (Item 3A), excluding mounting flanges. Max area of framed
opening is 90 in2 (580 cm2) [R-200 Device]. Max dimension of the opening is 9-1/2 in. wide x 9-
1/2 in. high (240 mm x 240 mm) [R-200 Device].
B. Gypsum Board. Min 5/8 in. (16 mm) thick x 4 ft (1.2 m) wide gypsum wallboard applied to
each side of the wall. The gypsum wallboard type, thickness, number of layers, fastener type and
sheet orientation shall be as specified in the individual wall assembly hourly rating design criteria
however 1 hour walls shall use at least 1 layer of Type X gypsum board and 2 hour walls shall use
at least 2 layers of ½ in (13 mm) thick type C gypsum board.
C. Mineral wool batts or blankets shall completely fill the stud cavity.
The hourly F rating is 1 and 2 hr for 1 and 2 hr rated assemblies, respectively.
The hourly T and TFM ratings are 0 hr and 1 hr for 1 and 2 hr rated assemblies, respectively.
Page 16 of 36
FM APPROVALS
Project ID: 3041526
| 2. | CABLES. Aggregate cross-sectional area of the cables in each device shall be from 0 to 100% fill. |
|---|---|
| Cables shall be rigidly supported on both sides of the wall assembly. |
Max 3/C No. 750 kcmil metal clad or Tech 90 type copper conductor power cable with
XLP insulation and PVC jacket material.
| 3. | FIRESTOP SYSTEM. The firestop system shall consist of the following: |
|---|
A. Firestop Devices – Circular firestop device for use in preformed openings. The firestop device
shall be inserted into the framed opening and friction fit on one side of the wall assembly.
Each device consists of a single/multi-diameter elastomeric sealing module and a steel
compression plate. The square openings of each device frame shall be filled with a single
elastomeric sealing module with a max of one (1) cable per sealing module. The steel flange of
each firestop device shall be secured to the steel stud framing of the wall assembly through the
gypsum wallboard layer by means of No. 8 x 3 in. (75 mm) long self-drilling, self-tapping steel
screws through the predrilled holes in the device frame mounting flange The sheets of the multi-
diameter sealing module halves are removed one by one until a max gap of 0.04 in. (1 mm) is
formed between the two modules halves. After installation of the modules into the device, the bolts
of the compression unit are tightened to form an effective seal around the cables. The device shall
be installed in accordance with the manufacturer’s written installation instructions.
Roxtec International AB, Rombvagen 2 – Verke Industriale
Karistrona, Sweden SE-37123
Frames
Types R-70; R-75; R-100; R-125; R-127; R-150 and R-200 frames and their corresponding
flanges SLFR70; SLFR75; SLFR100; SLFR125; SLFR127; SLFR150 and SLFR200.
Types R-70 EMC; R-75 EMC; R-100 EMC; R-125 EMC; R-127 EMC; R-150 EMC and R-200
EMC frames and their corresponding flanges SLFR70; SLFR75; SLFR100; SLFR125; SLFR127;
SLFR150 and SLFR200
Sealing Modules
RM, RM ES, RM PE, RM ES B or RM PE B Sealing Modules
*When RM ES B or RM PE B sealing modules are used, the T and TFM ratings are 0 Hr.
B. Silicone RTV Sealant (not shown) – A min ¼ in. (6 mm) diameter bead of silicone RTV
sealant shall be applied as a gasket between the device frame mounting flange and the gypsum
wallboard. The sealant bead shall be located between the edge of the opening and the line of
fasteners around the entire perimeter of the framed opening.
C. Packing Material – Pieces of minimum 3 in. (75 mm) thick, min 2.8 lbs/ft3 (45 kg/m3) density
mineral wool batt insulation cut to line the four (4) sides of the through opening within the wall
cavity. Pieces are cut to length and tightly friction fit between the framing of the wall opening and
cables and in-between cables flush with the wall surface.