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Section BC 719: Fire-Resistance Requirements for Plaster
719.1 Thickness of plaster.
719.2 Plaster equivalents.
719.3 Noncombustible furring.
719.4 Double reinforcement.
719.5 Plaster alternatives for concrete.
Section BC 720: Thermal- and Sound-Insulating Materials
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718.5 Combustible materials in concealed spaces in Type I or II construction.
Combustible materials shall not be permitted in concealed spaces of buildings of Type I or II construction.
   Exceptions:
      1.   Combustible materials in accordance with Section 603 of this code.
      2.   Combustible materials exposed within plenums complying with Section 602 of the New York City Mechanical Code.
      3.   Class A interior finish materials classified in accordance with Section 803 of this code.
      4.   Combustible piping within partitions or shaft enclosures installed in accordance with the provisions of this code.
      5.   Combustible piping within concealed ceiling spaces installed in accordance with the New York City Mechanical Code and the New York City Plumbing Code.
      6.   Combustible insulation and covering on pipe and tubing, installed in concealed spaces other than plenums, complying with Section 720.7 of this code.
Section BC 719: Fire-Resistance Requirements for Plaster
719.1 Thickness of plaster.
The minimum thickness of gypsum plaster or portland cement plaster used in a fire-resistance-rated system shall be determined by the prescribed fire tests. The plaster thickness shall be measured from the face of the lath where applied to gypsum lath or metal lath.

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