1. Floor Topping (optional, not shown): Gypsum
concrete, lightweight or normal concrete topping.
2. Floor Sheathing: Minimum 23/32 inch thick tongue-and-groove
wood sheathing (Exposure 1). Installed per code requirements.
3. Insulation: Minimum 2 inch thick mineral wool insulation batts – 3.5 pcf (nominal), supported by setting strip edges,
friction-fitted between the sides of the I-joist flanges.
4. Structural Members: Wood I-joists spaced a maximum
of 24 inches on center.
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Minimum I-joist flange depth: 1-5/16 inches |
Minimum I-joist flange area: 2.25 inches2 |
| |
Minimum I-joist web thickness: 3/8 inch |
Minimum I-joist depth: 9-1/4 inches |
| |
| See ASTM D 5055-07 for qualification requirements. |
5. Setting Strips: Minimum 1x4 (nominal) wood setting strips attached
with 1-1/2 inch long drywall screws at 24 inches on center along the bottom
flange of I-joist creating a ledge to support insulation.
6. Resilient Channels: Minimum 0.019 inch thick
galvanized steel resilient channels, attached perpendicular to I-joists
using 1-7/8 inch long drywall screws. Resilient channels spaced 16 inches
on center and doubled at each wallboard end joint extending to the next
joist.
7. Gypsum Wallboard: Minimum 5/8 inch thick Type
C gypsum wallboard installed with long dimension perpendicular to resilient
channels and fastened to each channel with minimum 1-1/8 inch long Type
S drywall screws. Fasteners spaced 7 inches on center and 3/4
inches from panel edges and ends. End joints of wallboard staggered.
8. Finish System (not shown): Face layer joints
covered with tape and coated with joint compound. Screw heads
covered with joint compound.
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Fire Test conducted at National Gypsum Testing Services, Inc. |
September 28, 2001 |
| |
Third Party Witness: Underwriter’s Laboratories, Inc. |
Report No: NC3369 |
|
STC and IIC Sound Ratings for Listed Assembly |
| Without Gypsum Concrete |
With Gypsum Concrete |
| Cushioned Vinyl |
Carpet & Pad |
Cushioned Vinyl |
Carpet & Pad |
| STC |
IIC |
STC |
IIC |
STC |
IIC |
STC |
IIC |
| 51 b |
46 b |
52 |
66 |
60 b |
48 b |
60 b |
60 b |
| a This assembly may also be used in a fire-rated roof/ceiling application, but only when constructed exactly as described. |
| b STC and IIC values estimated by David L. Adams Associates, Inc |
Copyright © 2002, 2007, 2009
AMERICAN WOOD COUNCIL
AMERICAN FOREST & PAPER ASSOCIATION, INC
January 2009
|
