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2514.2 Minimum thickness.
The minimum thickness of reinforced gypsum concrete shall be 2 inches (51 mm) except the minimum required thickness shall be reduced to 1 1/2 inches (38 mm), provided the following conditions are satisfied:
1. The overall thickness, including the formboard, is not less than 2 inches (51 mm).
2. The clear span of the gypsum concrete between supports does not exceed 33 inches (838 mm).
3. Diaphragm action is not required.
4. The design live load does not exceed 40 pounds per square foot (psf) (1915 Pa).
2514.3 Limitations of use.
Reinforced gypsum concrete shall not be used where exposed directly to the weather or where subject to frequent or continuous wetting. Precast units shall be protected by coverings or coatings from the weather and from contact with moisture during shipment and during storage at the work site.
2601.1 Scope.
These provisions shall govern the materials, design, application, construction and installation of foam plastic, foam plastic insulation, plastic veneer, interior plastic finish and trim, light-transmitting plastics and plastic composites, including plastic lumber. See Chapter 14 for requirements for exterior wall finish and trim.
2601.2 Exterior wall coverings.
The use of plastics in exterior wall coverings is subject to the following limitations:
1. Exterior wall coverings containing plastics shall not be permitted on Type IV construction utilizing cross-laminated timber (CLT) or structural composite lumber (SCL) complying with Section 602.4.
2. Exterior wall coverings containing plastics shall not be permitted at exterior balconies and shall comply with Section 1406.3.
Exception: Combustible water-resistive barriers complying with Section 1403.5.1.
2601.2.1 Construction documents.
Construction documents for exterior wall coverings required to be tested to NFPA 285 by this chapter shall comply with the requirements of Section 1401.2.
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