Fire & Sound Performance

Fire/Sound/Seismic Assemblies

Floor systems constructed with Open Joist™ floor trusses may be required to perform to minimum standards with regard to fire resistance and acoustical performance. Select a category to access the appropriate floor/ceiling assemblies for plan specifications.

Fire Assemblies:

45 Minute Endurance:
BS/SFWT 45-02

One Hour Endurance - Modular Construction:
BS/SFWT 60-10

One Hour Endurance:
BS/SFWT 60-06
BS/SFWT 60-07
BS/SFWT 60-08
BS/SFWT 60-09

Two Hour Endurance:
BS/SFWT 120-02

Fire Performance Certification:
IAPMO ER480

Acoustical Performance

1. Topping is Gypcrete or equivalent and/or carpet and pad (37 oz., 7/8" carpet with woven Polypropylene backing and 40 oz. felt pad or equivalent) or vinyl flooring (Armstrong Starstep or equivalent).
2. Sub-flooring - Minimum 5/8" tongue and groove plywood or oriented strand board (OSB).
3. Structural members - Open Joist™, all depths from 11-7/8" to and including 16", installed at 24" on-center or less.
4. Bridging - (optional) Continuous 2x nailed to the bottom chord and sides of the diagonals or verticals with 2" long nails. (See Installation Details)
5. Resilient Channel - Galvanized steel, 24 gauge, spaced 16" on-center and attached to the bottom chord by means of two (2) Type W screws. Channels overlap 10" at the end and are attached to each other by a 1-1/4" Type W screw.
6. Gypsum Board - 1 layer of 5/8" Type X. Long edges located between joists perpendicular to the resilient channels. Short edges staggered by 4' . Sheets are fastened to the resilient channels by means of 1-1/2" Type S screws, located 1-1/2" away from the edge and 3" away from the long edge. Screws are spaced 6" on-center. Joints are taped and finished with two layers of compound.
7. Insulation material - Cellulose (5-1/2" thick with 1.6 pcf density) or equivalent.

To download the Acoustical Performance Assembly detail below, right-click or Ctrl-click on the link, then choose “Save Target As” or “Save”.

• Acoustical Performance Assembly - DWG / PDF
• 

Acoustical Characteristics Table

The table shows the acoustical performance of this assembly.
Joist Depth	Insulation	Gypcrete	Carpet	Vinyl	STC	IIC
9 1/4"	Yes	No	No	No	42	38
9 1/4"	Yes	No	Yes	No	42	66
9 1/4"	Yes	No	No	Yes	42	44
9 1/4"	Yes	Yes	No	No	44	42
9 1/4"	Yes	Yes	Yes	No	44	70
9 1/4"	Yes	Yes	No	Yes	44	50
9 1/4"	No	No	No	No	41	35
9 1/4"	No	No	Yes	No	41	63
9 1/4"	No	No	No	Yes	41	41
9 1/4"	No	Yes	No	No	44	32
9 1/4"	No	Yes	Yes	No	44	60
9 1/4"	No	Yes	No	Yes	44	38
11-7/8"	Yes	No	No	No	46	39
11-7/8"	Yes	No	Yes	No	46	67
11-7/8"	Yes	No	No	Yes	46	45
11-7/8"	Yes	Yes	No	No	53	44
11-7/8"	Yes	Yes	Yes	No	53	72
11-7/8"	Yes	Yes	No	Yes	53	50
11-7/8"	No	No	No	No	46	30
11-7/8"	No	No	Yes	No	46	65
11-7/8"	No	No	No	Yes	46	43
11-7/8"	No	Yes	No	No	52	37
11-7/8"	No	Yes	Yes	No	52	67
11-7/8"	No	Yes	No	Yes	52	43
14"	Yes	No	No	No	47	40
14"	Yes	No	Yes	No	47	68
14"	Yes	No	No	Yes	47	46
14"	Yes	Yes	No	No	53	44
14"	Yes	Yes	Yes	No	53	72
14"	Yes	Yes	No	Yes	53	50
14"	No	No	No	No	46	30
14"	No	No	Yes	No	46	65
14"	No	No	No	Yes	46	43
14"	No	Yes	No	No	52	37
14"	No	Yes	Yes	No	52	67
14"	No	Yes	No	Yes	52	43
16"	Yes	No	No	No	48	41
16"	Yes	No	Yes	No	48	69
16"	Yes	No	No	Yes	48	47
16"	Yes	Yes	No	No	53	45
16"	Yes	Yes	Yes	No	53	73
16"	Yes	Yes	No	Yes	53	51
16"	No	No	No	No	47	31
16"	No	No	Yes	No	47	65
16"	No	No	No	Yes	47	43
16"	No	Yes	No	No	53	38
16"	No	Yes	Yes	No	53	68
16"	No	Yes	No	Yes	53	44

Note: The values in Italic are estimated and represent the minimum expected value obtained through laboratory testing.

To download the Acoustical Characteristics table above, right click or ctrl-click on the link, then choose "Save Target As" or "Save".

• Acoustical Characteristics Table – PDF
•