Design No. L549

Unrestrained Assembly Rating 1 hr.

  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 thicknesses. Trusses spaced a max of 48 in. OC.
  2. MiTek Industries, Inc. Ultra-Span® Prefabricated Light Gauge Steel Truss System

    Fabrication & installation by: Superior Truss & Panel, Inc. 2204 West 159th Street, Markham, Il 60426 Contact: Mike Goncher or Bryce Welty Ph. 708-339-1200 Fx. 708-339-1248

  3. Bridging (not shown) - Location of lateral bracing for truss chord and web sections to be specified on truss engineering.
  4. Flooring System The finished floor may consist of any one of the following systems:
  5. System No. 1

    Finish Floor Nom 1 by 4 in. T & G: laid perpendicular to trusses; or 15/32 in. thick plywood, min grade "Underlayment" or "Sturd-I-Floor" with T & G long edges, and comforming with PS 1-83 specifications; or non-veneer APA rated Sturd-I-Floor, T & G panels per APA specifications PRP-108. Long dimensions of panel (strength axis) or face grain of plywood to be perpendicular to trusses with joints staggered.

    Vapor barrier (optional) Commercial asphalt saturated felt, .030 in. thick.

    Subflooring 23/32 in. thick plywood with T&G edges along the 8ft sides and exterior glue; or non-veneer APA rated Sturd-I-Floor T & G panels per APA specifications PRP 108. Installed perpendicular to trusses with end joints staggered 4 ft. Plywood or non-veneer APA rated panels, mechanically fastened to trusses 12 in. OC in conjunction with construction adhesive.

    System No. 2

    Finish Flooring Floor Topping Mixture* - 6.8 gal of water to 80 lbs of floor topping mixture to 1.9 cu ft. of sand. Compressive strength to be 1100 psi min. Thickness to be in. min.

    Hacker Industries, Inc. Firm Fill, Firm-Fill 2010, Firm Fill High Strength, Gyp-Span Radiant

    Floor Mat Material (optional) Nom in. thick, adhered to subfloor with Hacker Floor Primer. Primer to be applied to the surface of the Mat prior to the placement of a min 1-1/2 in. of floor topping mixture.

    Hacker Industries, Inc. Sound-Mat

    Subflooring 23/32 in. thick plywood with T & G edges along the 8 ft. sides and exterior glue, or non-veneer APA rated Sturd-I-Floor T & G panels per APA specifications PRP-108. Installed perpendicular to trusses with end joints staggered 4ft. Plywood or non-veneer APA panels, mechanically fastened to trusses 12 in. OC in conjunction with construction adhesive.

  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 in. long screws.
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  8. 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.
  9. Canadian Gypsum Company Type C or IP-X2

    United States Gypsum Company Type C or IP-X2

    Yeso Panamericano S.A. de C.V. Type C or IP-X2

  10. 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.
  11. 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.

 

*Bearing the UL Classification Marking

This design was reproduced from the original UL design Document.