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  1. U

    sprinkler in hydraulic elev. hoistway?

    California CBC 3005.4.1 refer to NFPA 13, 8.15.5.3. NFPA 13, 8.15.5.3 says sprinkler shall NOT be required in machine rooms, elevator machinery spaces, ..., or hoistways of TRACTION elevators ..., where all of the following conditions are met. There are 5 conditions. # 5 says The elevator...
  2. U

    Trap seal primer

    sorry I am an architect but I have a plumbing question for engineers here For sprinkler drain, when it dumps to a hub drain, gang drain, however you call it and then to the sewer line, many times a trap seal primer is added next to the sprinkler drain. How does this trap seal primer work? what...
  3. U

    Exterior area of assistant rescue

    It is open stair.
  4. U

    Exterior area of assistant rescue

    I always thought it meant for "exterior" area of refuge...but seems it was incorrect. Exterior area of assistant rescue meant for exit discharge level only? So for exterior exit stair, the area for wheelchair persons waiting for rescue at each landing level is called area of refuge? Also 2-way...
  5. U

    Aerial fire apparatus access roads

    Thank you all for answering me. How to attach image that I saved on computer without URL? I have more to ask...
  6. U

    Aerial fire apparatus access roads

    Please help me to understand this better... What is the point of this requirement? Is it just to get onto the roof? If our building has pitched roof with mechanical roof well in the middle, is the sloped roof (metal panel roof) required to be accessible? If there is a roof access hatch to get...
  7. U

    Exit access stair in type II A

    Thank you both for getting back to me. since the exit access stair is only connecting 2 floors in our building, I guess no rating is required even it still feels weird to me... ;-)
  8. U

    Exit access stair in type II A

    We have a completely open exit access stair in a type II-A classroom building. It is egress stair. II-A requires the floor and secondary framing to be 1 hr but there is no fire rating required for exit access stair. I read some former posts debating whether the stair framing is primary or...
  9. U

    Combined mechanical / electrical room

    Thanks CDA. Why did you leave SD? The building is existing and the room is existing. Equipments are all new. The renovation is pretty much leaving the shell and stairs. All the interior are demo-ed for new. I think they should bring everything up to code. I am just no so familiar with...
  10. U

    Storage room door @ under the exterior stairway

    code (CBC 1011.7.4) says "There shall not be enclosed usable space under exterior exit stairways unless the space is completely enclosed in 1-hour fire-resistance-rated construction..." My question is the door to this storage room. If the door is on the exterior wall, does it require any rating...
  11. U

    Combined mechanical / electrical room

    We have a community college renovation project that has a utility basement which basically is just a big mechanical / electrical room. This room connects to the campus central plant by tunnels. In this mech/elec room, there are several transformers. One of them is substation type, the others are...
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