Intumescent paints may be a desirable solution as a

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on systems. Intumescent paints may be a desirable solution as a fire-resistant coating for steel that is exposed to view. Primed or painted surfaces can present potential adhesion problems for spray-on fireproof coatings. If paint is specified for structural steel that will subsequently be protected with spray-on fireproofing, e.g., metal deck, the architect should contact both the paint and fire protection suppliers, in advance, to ensure compatibility of the two products. Otherwise, bonding agents or costly field modifications may be necessary. Generally, as long as the steel surface is free of dirt and oil, the presence of light rust will not adversely affect the adhesion of spray- on fire protection.
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PAGE 5 DETAILS DETAILING CONSIDERATIONS FOR MASONRY Sample plan and section details for masonry are given in Figures 1a, 1b, and 1c. These figures illustrate many of the concepts discussed in the GENERAL CONSIDERATIONS Section, as well as those discussed in this section. Enclosure System. For the purpose of this Guide, the enclosure system is defined as the weather tight wall system that encloses the building. It is essential that the location of the enclosure system be determined relative to the column centerlines at an early stage of the project. Proper position of the enclosure system is critical because it can increase the chances for economical solutions to bracing systems, foundations, and perimeter framing mem- ber sizes in the building. Concrete masonry units (CMU) have been selected as the back-up system for the masonry details. CMU was cho- sen because it has a long history of successful applications. Another viable back-up system that may be appro- priate in various areas of the country is a metal stud back-up system. Consult a cost estimator for economic advantages of both systems in a particular area. A metal stud back-up system has been found to be economical for specific applications, however, it is generally a less forgiving system than CMU, and requires close attention to detailing and assembly of the system. The following aspects of the enclosure system should be carefully considered: Location of inside face of CMU relative to column centerline When considering the use of a brick and CMU enclosure system, the location of the entire enclosure sys- tem relative to the column centerline must be determined. The brick and block enclosure system should completely bypass the floor slab, perimeter beam flanges, as well as the column flanges, or the brick should bypass the slab while each floor slab supports the CMU. There are advantages and disadvantages to both alternatives. If the masonry enclosure system bypass- es the slab edge, the perimeter steel members do not support the load of the masonry at each floor, and therefore allow the perimeter steel members to be lighter and shallower.
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  • Structural steel

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