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R-3 Elevator

Francis Vineyard

Francis Vineyard

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Joined
Jan 1, 2010
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3,105
Location
Charlottesville, VA
Your thoughts on the elevator shaft penetrating 4 stories.

1. IRC 3 story + basement and occupiable roof. The roof can be accessed by an elevator; no rating required.

2. Same as above but a room (home office) above the 3rd story (takes up 1/3 of the flat roof but is not considered a mezzanine above the ceiling).

For No. 2 with the same foot print as #1 (27 x 36) and a 13R system requires a 2 hr. elevator shaft.

Paradoxially in both scenerios the stair tower can be unenclosed.

Am I missing something?
 
Plus have you seen the discussion,,

If elevator is open and not in a shaft, never mind.
 
Sorry I foget they keep changing the alaphbet in the code

Is this a plain old house or some other R-3???
 
Same Detached Single Family Dwelling

1. IRC an elevator 4 stories (basement plus 3 stories) and an occupiable roof (a level but not a story).
2. IBC the elevator penetrates 4 stories to a room on the roof.

Can you justify not to require a 2 hour shaft?
 
Francis Vineyard said:
Same Detached Single Family Dwelling

1. IRC an elevator 4 stories (basement plus 3 stories) and an occupiable roof (a level but not a story).
2. IBC the elevator penetrates 4 stories to a room on the roof.

Can you justify not to require a 2 hour shaft?
Click to expand...


Well
There must be stairs open to at least three floors?? Not enclosed

Correct?
 
cda said:
Well
There must be stairs open to at least three floors?? Not enclosed

Correct?
Click to expand...
That is permitted in the IBC by an exception in 2012 1009.3 and 2015 1019.3 to not enclosed stairs, is there one for elevator shafts?

Exit access stairways serving and contained within a single residential dwelling unit or sleeping unit in Group R-1, R-2 or R-3 occupancies are not required to be enclosed.

The exception for elevator if it's unconcealed;

712.1.2 Individual dwelling unit. Unconcealed vertical openings totally within an individual residential dwelling unit and connecting four stories or less shall be permitted.

713.14 Elevator, dumbwaiter and other hoistways. Elevator, dumbwaiter and other hoistway enclosures shall be constructed in accordance with Section 713 and Chapter 30.
 
cda said:
But you are dealing with IRC
Click to expand...
I'm dealing with a development that will have the same dwelling units, one with and occupiable roofs under IRC. Others will be 4 story above grade under the IBC.

The elevators in all these detached single family dwelling units will penetrate 4 stories. But the IBC ones that are sprinklered 13R are required to have 2 hr. shafts!

Is this reasonable?
 
If the project falls under IBC, yes reasonable



Not our fault they build strange stuff strange ways
 
Let me restate the question; other than because the code says so, and in reference to the other exceptions permitted (unlimited exit access travel distance for less than 20, single exit, storage access under stairs, nonrated partitions, unlimited openings 5 ft. FSD, etc.) is there a reason to rate the shaft within a single family dwelling (of type 5B construction)?
 
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