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

  2. Bridging – (not shown) - Location of lateral bracing for truss chord and web sections to be specified on truss engineering.

  3. Flooring System – The finished floor may consist of any one of the following systems:

    4. 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 ¾ in. min.

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

    Floor Mat Material – (optional) – Nom ¼ 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.

  4. 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 ½ in. long screws.

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  5. 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.

    6. 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

  6. 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.

  7. 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.