Design No. G540
Restrained
Assembly Rating 1hr.
Unrestrained
Assembly Rating 1hr.
1.
Structural Steel Members* - Pre-fabricated light
gauge steel truss system consisting of cold formed, galvanized steel chord and
web sections. Trusses fabricated in
various sizes, depths, and from various steel thickness. Trusses spaced a max of 48 in. OC.
MiTek Industries, Inc. Ultra-Spanฎ
Prefabricated Light Gauge Steel Truss System
Engineering, fabrication & installation by:
Superior Truss & Panel, Inc. 2204
West 159th Street
Markham, Illinois
60426 Contact Bill Welty
708-339-1200
2.
Bridging (not shown) -
Location of lateral bracing for truss chord and web sections to be
specified on truss engineering.
3.
Metal Lath 3/8 in. rib, 3.4 lb/yd2
expanded steel lath tied to each truss at every other rib and midway between
trusses at side labs with 18 SWG galv steel wire. As an alternate, the form material for the concrete may be
corrugated steel deck, min 9/16 in. deep, 28 MSG galv steel, mechanically
fastened to trusses 15 in. OC. The
concrete topping thickness shall be measured to the top plane of the steel deck.
4.
Welded Wire Fabric 6 by 6 in., 10/10 SWG.
5.
Normal Weight or Lightweight Concrete
Carbonate or siliceous aggregate, 150 +- 3pcf unit weight, 3000 psi
compressive strength. Lightweight
concrete, expanded shale, clay or slate aggregate by rotary kiln method, 117+-
3fpcf unit weight, 3000 psi compressive strength.
6.
Resilient Channels Formed of 25 MSG galv
steel, installed perpendicular to the steel trusses (item 1), spaced a max of 16
in. OC when no insulation (item 8) is fitted in the concealed space, or a max of
12 in. OC when insulation (item 8) is fitted in the concealed space, draped over
the resilient channel/gypsum wallboard ceiling membrane.
Two courses of resilient channel positioned 6 in. OC at wallboard
butt-joints (3 in. from each end of wallboard).
Channels orientated opposite at wallboard butt-joints. Channel splices
overlapped 4 in. beneath steel trusses. Channels
secured to each truss with Type S12 by ฝ in. long screws.
6A. Resilient Channels - As an alternate to item 6, Resilient Channels, double legged formed of 25 MSG galv. steel 2 7/8 in. wide by 1/2 in. deep, installed perpendicular to the steel trusses (item 1), spaced a max of 16 in. OC when no insulation (item 8) is fitted in the concealed space, or a max of 12 in. OC when insulation (item 8) is fitted in the concealed space, draped over the resilient channel / gypsum wallboard ceiling membrane. Two courses of resilient channel positioned 6 in. OC at wallboard butt joints (3 in. from each end of wallboard). Channel splices overlapped 4 in. beneath steel trusses. Channels secured to each truss with Type S12 by 1/2 in. long screws or with No. 18 SWG steel wire double strand saddle ties. Channels tied together with double strand of No. 18 SWG galv. steel wire at each end of overlap.
7.
Wallboard, Gypsum* - One layer of nom 5/8 in.
thick by 48 in. wide boards, installed with long dimension parallel to trusses.
Attach to the resilient channels using 1 in. long Type S bugle head
screws. Screws spaced a max of 12
in. OC along butted end-joints and in the field when no insulation (item 8) is
fitted in the concealed space, or a max of 8 in. OC along butted end joints and
in the field when insulation (item 8) is fitted in the concealed space, draped
over the resilient channel/gypsum wallboard ceiling membrane.
Canadian Gypsum Company Type C or IP-X2
United States Gypsum Company Type C or IP-X2
8.
Batts and Blankets* - Optional Any thickness
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
wallboard ceiling membrane.
9.
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 vaneer plaster may be applied to the entire
surface of gypsum wallboard.
10. Steel Beam - Optional - (not shown) - W8 x 35 min. size, used to support structural steel members (item 1) at ends.
*Bearing the UL Classification Marking
UL
DESIGN NO. G540
This design was reproduced from the original UL
design Document.
Engineering, fabrication and installation by:
Superior
Truss & Panel, Inc.
2204
West 159th Street
Ph.
708-339-1200 Fx. 708-336-1248
Web site : www.superior-truss.com
Contact: Bill Welty