A b c concrete slab metal lath and plaster open web

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(A) (B) (C) Concrete Slab Metal Lath and Plaster Open-Web Steel Joist Metal Lath Beam Cage Steel Beam Plaster Concrete Slab Angle Two Layers of Type X Gypsum Board Steel Beam
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PAGE 63 SYSTEMS over cold-formed steel framing or furring. Detailed information on using this material for fire protection is available from the Gypsum Association. The effectiveness of gypsum-based fire protection materials can be increased significantly by the addition of light- weight mineral aggregates such as vermiculite and perlite. For plaster applications, it is important that the mix is properly proportioned, applied in the required thickness, and that the lath is properly installed. In the case of gyp- sum wallboard, three types are readily available; regular, Type X and proprietary. Type X wallboards have spe- cially formulated cores that provide greater fire resistance than regular wallboard of the same thickness. In addi- tion many manufacturers produce proprietary wallboards with even greater fire-resistance characteristics. It is important to verify that the wallboard used is that specified for a particular design. In addition, special types and spacing of fasteners and furring channels may be required. Spray-applied Fire Resistive Material The most widely used fire protection materials for structural steel are mineral fiber and cementitious materials that are spray-applied directly to the contours of beams, columns, girders and floor/roof decks (see Figure 32). These materials are based upon proprietary formulations and it is imperative that the manufacturers' requirements be followed with regard to mixing and application. Fire-resistant designs as to type and thickness of material are published by UL. Because these materials are applied directly to the steel, adhesion is an important consideration. Prior to appli- cation, the structural steel should be free of dirt, oil and loose scale. Light corrosion will not adversely affect adhesion. Steel Beam Mineral Fiber Concrete Slab Steel Deck Mineral Fiber Steel Girder Steel Floor Beam Mineral Fiber Figure 32. Mineral fiber spray applied to beam and girder floor system with steel floor deck supporting a concrete slab. Illustration courtesy of the American Iron and Steel Institute, Designing Fire Protection for Steel Beams .
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SYSTEMS PAGE 64 Steel that is to be fire protected with spray-applied material should not be painted or primed unless it is in a cor- rosive environment, in which case, the bond between primer coat and fire-protective layer must be verified by UL. There are a number of primers that have this certification. In addition, research has found that it is not necessary to paint structural steel when it is fully enclosed between the inside and outside walls of a building, or otherwise protected, such as with spray-applied fire protection materials.
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  • Structural steel

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