| 1. | Topping (Optional): Lightweight concrete or proprietary topping. |
| 2. | Sub-Flooring: Minimum 5/8" plywood or oriented strandboard (OSB) when topping is used, otherwise 3/4" 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 1-1/2" by 2-1/2", installed at 24" oc maximum. |
| 4. | Resilient Channels: Nominal 24 gauge galvanized steel 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 1-5/8" long Type W screws at teach joist intersection. |
| 5. | Gypsum Board: One layer of 5/8" Type C gypsum wallboard installed perpendicular to channels with end joints staggered 48". Boards to be fastened to channels with minimum 1-1/8" Type S screws located 7" oc. Screws shall be minimum 1-1/2" from board edges and 3/4" from board ends. Gypsum wallboard shall be taped and filled. Screw heads shall be filled with gypsum joint compound. |
| 6. | Insulation: 2" rock wool insulation, nominal 3.5 pcf density, friction fit between flanges, resting on wood furring strips. |
| 7. | Wood Furring Strip (Not Shown): Nominal 1" x 4" wood furring strip installed under each bottom flange, centered on flange, fastened with 1-1/4" Type W screws located 24" oc. |
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). |