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How much sheetrock above boiler for fireproofing?

D107 Member Posts: 1,798
I thought I remember 5/8" board extending up to 7ft past the boiler's edge? Need not be greenboard I assume.




  • Brad White_9
    Brad White_9 Member Posts: 2,440

    5/8" Type X is prescribed. I am not familiar with how far it must extend, but one layer gives I believe 15 minutes protection. Two layers both sides on a metal stud wall is a 2 hour assembly. The efficacy of these assemblies are in UL standards and are more of an architectural area of expertise.
  • My copy

    of NFPA 31 is at the shop . I believe Nassau County and the towns in it follow that book . I'll check it out Monday and also see if local codes supercede .
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