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  1. Nythius

    Double firewall with roof FRR less than wall

    I am designing an 1 storey (approx 20ft floor to roof) addition to a 1 story building with new CMU adjacent to existing CMU. Firewall required. The addition needs to be completely separate structurally for several reasons which I won’t discuss. Firewall required FRR is 4hrs total with each wall...

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