Under unamended 2021 IPC Section 1002.4.1.1, which arrangement provides the specified potable-water-supplied trap seal protection for an emergency floor drain?
- An ASSE 1018 trap seal primer valve discharging to the trap’s inlet side above the trap seal
- BA spring-loaded check valve in the trap outlet with no primer supply
- CA deeper trap seal used alone, without any recognized seal-protection method
- DA loose cleanout plug that admits room air to the drain
Where to look it up
https://www.ncosfm.gov/b-1-2024-ncpc/open
Why A is correct
Section 1002.4.1.1 requires a potable-water-supplied primer conforming to ASSE 1018 and an inlet-side discharge connection above the trap seal. This replaces water lost through evaporation. Other recognized methods have their own standards and installation conditions. In particular, Section 1002.4.1.5 allows a lavatory/hand-sink drain connection for specified receiving fixtures in the same room; its adjacent-room allowance concerns the drinking-fountain connection, not every source fixture. Neither extra seal depth nor a loose plug substitutes for a recognized method. See PDF p.140. Reference: unamended 2021 IPC base text reproduced in the official OSFM comparison, https://www.ncosfm.gov/b-1-2024-ncpc/open