The following fire resistant assembly designs are listed in accordance with ASTM-E119 (Fire Tests of Building Construction and Materials), CAN/ULC-S101 (Standard Methods of Fire Endurance Tests of Building Construction and Materials), NFPA-251 (Fire Tests of Building Construction and Materials), UBC-7-1 (formerly UBC-43-1), (Uniform Building Code Standard).

2. SUB-FLOORING: Sub-floor panels to conform to one of the following:

NOTE: All panel products are to be produced with adhesive qualified as interior use/exterior grade (exposure 1) or better.

Unless otherwise noted, panels are T & G, maximum width 48" with long dimensions installed perpendicular to joists. End joists are staggered Minimum 24" and butted over joists.

Unless otherwise noted, Minimum nominal thickness of sub-flooring is:

3. SUB-FLOORING FASTENING: Minimum length of fastener for sheathing and subfloor attachment for thickness from 5/8" (15.9mm) to 3/4' (19mm) thick is: a) Common or Spiral Nail: 2" (51mm) (Canada); 8d (0131" dia. x 2.5" long) (US) b) Ring Thread Nail: 1-3/4" (45mm) (Canada); 6d (0.120" dia. x 2" long) (US) Nail spacing shall be 6" (150mm) oc along butt edges of panel and 12" (300mm) (Canada) and 10" (US) oc along intermediate support.

4. STRUCTURAL MEMBERS: Listed fire designs are based on systems designed for structural and functional performance in accordance with Nordic procedures. All designs are tested in unrestrained configuration. Joists have a minimum depth of 9-1/4" and spaced up to a maximum of 24" oc for floor/ceiling systems. The following products are eligible for use in the designs. Limitations are indicated in individual designs. All of the joist products stated below are eligible for use in Table A-9.10.3.1B of the National Building Code of Canada 2005, as followed:

1. No fire resistant rating; Assemblies F3, F4, F12, F13, F16, F17
2. 45 Minute fire resistance; Assemblies F5, F8, F10, F14, F18, F20
3. 60 Minute fire resistance; Assemblies F6, F7, F8, F9, F10, F11, F14, F15, F19, F20, F21
   

   Series	Depths
   NI-20	9-1/4", 9-1/2", 11-1/4", 11-7/8"
   NI-40	9-1/2", 11-7/8", 14", 16"
   NI-40x	9-1/4", 9-1/2", 11-1/4", 11-7/8", 14", 16"
   NI-60	9-1/2", 11-7/8", 14", 16", 18"
   NI-70	9-1/2", 11-7/8", 14", 16"
   NI-80	9-1/4", 9-1/2", 11-1/4", 11-7/8", 14", 16"
   NI-80x	18", 20", 22", 24"
   NI-90x	11-7/8", 14", 16"

6. GYPSUM BOARD: All Gypsum Board is listed 5/8" (15.9mm) Type X, unless otherwise noted. In certain cases, as noted, it may be specific proprietary type with other designations identified in conjunction with the manufacturer's name. Maximum width is 48" and unless otherwise noted, all exposed joints are taped and finished with two additional coats of joint compound. Screw heads are covered with two coats of joint compound.

7. BLOCKING: Where required, I-joist sections may be used for blocking, fastened to top and bottom chords of joists, and to be spaced at 7' oc maximum.

8. INSULATION: All batts are to be placed between bottom joist flanges and supported by metal furring channels. In assemblies where metal furring channels are not utilized, support insulation batts on nominal 1" x 3" wood furring strips spaced 16" oc along the top side of the bottom flange. Equivalent methods that retain insulation above joist bottom flange are acceptable. All butt joints shall be over furring channels.

Items that may be added to the assemblies to increase IIC Ratings:

a. Adding a second 5/8" sub-floor......................................adds 2 points
b. Adding 5/8" sub-floor plus 1/16" building paper..........adds 3 points
c. Adding Vinyl floor covering..............................................adds 2 points
d. Adding Hardwood floor covering.....................................adds 2 points
e. Adding Carpet & Underlay.................................................adds 20 points.

1.	Topping (Optional): Lightweight concrete or proprietary topping.
2.	Sub-Flooring: Minimum 5/8" plywood or oriented strandboard (OSB) when topping is used, otherwise 23/32" thickness is required. Plywood installed perpendicular to joists with end joints staggered, fastened in accordance with Code requirements.
3.	Structural Members: Nordic I-joist, minimum joist depth 9-1/4", minimum flange dimension 1-1/8" by 2", installed at 24" oc maximum.
4.	Insulation (Optional): Max. 6" fiberglass or rockwool batt insulation, friction fit between flanges or webs and supported using wires every 16".
5.	Resilient Channels: Nominal 25 gauge galvanized steel resilient channels installed perpendicular to joists and spaced 16" oc maximum. Additional channels required at gypsum wallboard end joints such that each board end rests on its own channel. These additional channels shall extend to the next joist on each side of the board edges. Channels fastened with two 1-5/8" long Type S screws at teach joist intersection.
6.	Gypsum Board: Three layers of 5/8" Type C gypsum wallboard. Base layer applied directly to joists, installed with long dimensions perpendicular to joists with end joints butted over joists and staggered 24" minimum. Base layer fastened with 1-5/8" Type S screws, spaced 12" oc at the joints and in the filed. Middle & Face layer installed over channels with long dimension perpendicular to resilient channels and edges, staggered 24" from base layer end joints. Middle layer fastened with 1" Type S screws located 12" oc at the joints and in the field. Face layer fastened with 1-7/8" Type S screws are placed 8" oc at joints and in the field. (Screw lengths are minimums).