6/30/2015
BXUV.G592 ­ Fire­resistance Ratings ­ ANSI/UL 263
Design No. G592
BXUV.G592
Fire­resistance Ratings ­ ANSI/UL 263
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Authorities Having Jurisdiction should be consulted in all cases as to the particular requirements covering the installation and use of UL
Certified products, equipment, system, devices, and materials.
Authorities Having Jurisdiction should be consulted before construction.
Fire resistance assemblies and products are developed by the design submitter and have been investigated by UL for compliance with
applicable requirements. The published information cannot always address every construction nuance encountered in the field.
When field issues arise, it is recommended the first contact for assistance be the technical service staff provided by the product
manufacturer noted for the design. Users of fire resistance assemblies are advised to consult the general Guide Information for each
product category and each group of assemblies. The Guide Information includes specifics concerning alternate materials and alternate
methods of construction.
Only products which bear UL's Mark are considered Certified.
BXUV ­ Fire Resistance Ratings ­ ANSI/UL 263
BXUV7 ­ Fire Resistance Ratings ­ CAN/ULC­S101 Certified for Canada
See General Information for Fire­resistance Ratings ­ ANSI/UL 263
See General Information for Fire Resistance Ratings ­ CAN/ULC­S101 Certified for Canada
Design No. G592
April 15, 2015
Restrained Assembly Rating ­ 1 and 2 Hr. (see Items 7 and 7A)
Unrestrained Assembly Rating ­ 1 and 2 Hr. (see Items 7 and 7A)
Unrestrained Beam Rating ­ 1 and 2 Hr. (see Items 7 and 7A)
Loading on Beam (Item 1) Determined by Allowable Strength Design Method or Load and Resistance Factor Design Method
specified in ANSI/AISC 360­10 Specification for Structural Steel Buildings
This design was evaluated using a load design method other than the Limit States Design Method (e.g., Working Stress Design
Method). For jurisdictions employing the Limit States Design Method, such as Canada, a load restriction factor shall be used —
See Guide BXUV or BXUV7
* Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification (such
as Canada), respectively.
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1. Steel Beam — Optional—W10x22 (fy=50 ksi) min size, used to support structural steel members (Item 2) at their
ends.
2. Structural Members* — Pre­Fabricated light gauge truss system consisting of a cold­formed, galvanized steel
chord and web sections. Trusses are 18" deep ­min. 18 ga material, spaced at max. 24"o.c.
PRESCIENTCO INC — Pre­fabricated Light Gauge Steel Truss System
3. Bridging — (Not Shown) ­ Lateral bracing required at the truss bottom node that is closest to the truss supports,
lateral bracing installed as per truss manufacturer's instructions. Additional lateral bracing maybe required as per truss
manufacturer's instruction.
4. Flooring System — Mineral and Fiber Boards* ­ Nom 1 in. thick, with long edges tongue and grooved. Long
dimension of panels to be perpendicular to Structural members (Item 2) with end joints staggered a min of 2 ft and
centered over the joists. Panels secured to steel joists with 2­1/2 in. long No. 8 selfdrilling, self­countersinking steel
screws spaced a max of 8 in. OC in the field and 4 in. OC on the perimeter with a screw located 3/4 in. from each edge
of the panel.
PLYCEM CONSTRUSISTEMAS EL SALVADOR S A DE C V — Types Plycem, Plycem­Fibrolit.
PLYCEM CONSTRUSISTEMAS HONDURAS S A DE C V — Types Plycem, Plycem­Fibrolit.
THE PLYCEM COMPANY INC — Types Plycem, Plycem­Fibrolit.
5. Resilient Channels — Minimum 25 GA galvanized steel, 1/2 in. deep, 2­3/4 in. wide. Channels shall be spaced
maximum 12 in. apart and attached to the bottom flange of each Structural Member (Item 2) with one 7/16 in. long
wafer head self­drilling, self­tapping #7 steel screw. At locations where gypsum board end joints occur, additional
resilient channels shall be installed to provide screw attachments for the gypsum board ends. These additional channels
shall be positioned so that the distance from the end of the board to the center of the first channel is 3 in. and from the
board end to the center of the next channel is 12 in.
6. Batts and Blankets* — Any 3­1/2 in. thickness, minimum density 0.5 lb/ft3, unfaced mineral wool or glass fiber
insulation bearing the UL Classification Marking for Surface Burning Characteristics, having a flame spread value of 25
or less and a smoke value of 50 or less. Insulation fitted in the concealed space, draped over the resilient
channel/gypsum board ceiling membrane.
7. Gypsum Board* — ( For 1 hr rating). One layer of nom 5/8 in. thick by 48 in. wide boards, installed with long
dimension parallel to Structural member (Item 2). Attached to resilient channels using 1 in. long Type S, #6 bugle­
head screws. Screws spaced a max a max of 8 in. OC in the field. At the butt side joints, screws shall be located 1­1/2
in. and 4 in. from the board edges.
UNITED STATES GYPSUM CO — Types C
7A. Gypsum Board* — (For 2 hour Rating). Nom 5/8 in. thick, 48 in. wide gypsum panels. Base layer installed with
long dimension perpendicular to resilient channels, secured with 1­1/4 in. long Type S bugle­head screws spaced 12 in.
OC, with screws located 6 in. from and on each side of the gypsum panel, in both the field and the perimeter, and 1­
1/2 in. from side edges of the panels. Face layer installed with long dimension perpendicular to resilient channels with
joints offset 24 in. from base layer, secured with 1­5/8 in. long Type S bugle­head screws spaced 8 in. OC in both the
field and the perimeter, and 1­1/2 in. from side edges of the panel. Butt joints of face layer panels secured to base
layer with 1­1/2 in. long Type G screws spaced 8 in. OC and 1­1/2 in. from side edges of the panels, with butt joints
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located between resilient channels. Butt joints of face panels staggered a minimum of 12 in. from butt joints of base
layer.
UNITED STATES GYPSUM CO — Types C
8. Finishing System — (Not Shown) — Vinyl, dry or premixed joint compound, applied in two coats to joints and screw
heads; paper tape, 2 in. wide, embedded in first layer of compound over all joints. As an alternate, nom 3/32 in. thick
veneer plaster may be applied to the entire surface of gypsum wallboard.
* Indicates such products shall bear the UL or cUL Certification Mark for jurisdictions employing the UL or cUL Certification
(such as Canada), respectively.
Last Updated on 2015­04­15
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