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R-3 single family occupied roof access

Can it only be from a stair, or can I use an alternating tread device or ships ladder with a hatch?

I know in the IBC you can use it only for an unoccupied roof, but I'm wondering about California Residential Code for a single family house (with a flat roof deck).

I can't find anything in the CBC that makes me think it is permitted, but I wanted to ask you smart folks.  There's a lot of examples of where this condition is built: http://www.houzz.com/rooftop-deck-ships-ladder

 
Sep 3, 16 8:37 pm
JeromeS

Here in NJ, the IRC only applies to R-5, on and two family dwellings.  Anything else, including R3 is IBC. IBC permits alternating tread stairs.

Sep 3, 16 9:43 pm  · 
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JeromeS

Set aside my previous answer: alternating tread devices are a means of egress. No means of egress is required from an unoccupied roof.

Sep 3, 16 9:52 pm  · 
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Thanks for the response Jerome, although I'm really confused by what you've written.  There is no R-5 occupancy in the IRC or IBC, and as I mentioned, the roof is occupied.  I know you can use them from an unoccupied roof. Regardless, California Residential Code includes R-3, which is what I'm talking about (just residential code)

Sep 3, 16 10:29 pm  · 
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gruen
R5 is written into some jurisdictions. Just put a regular stair. Roof deck is the place to drink, don't make them fall down a ladder. There's no allowance in the IRC for anything other than stairs.
Sep 4, 16 12:32 pm  · 
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JeromeS

How does 1006.3 impact your design, including tables?

Sep 4, 16 12:46 pm  · 
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Not sure I'm looking at the right 1006.3, I'm seeing egress illumination.

I think gruen is right, I was hoping there might just have been something I overlooked

Sep 4, 16 1:12 pm  · 
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JeromeS

We are using 2015. 1006.3 is egress from occupied roofs...

Sep 5, 16 9:17 am  · 
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neejgore

Hey Tyler, did you get an answer to this question? I have a similar one that I am trying to figure out now. Thanks in advance.

Nov 11, 21 1:33 am  · 
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This is a while back, but I don't remember finding anything that permitted it.  I think it is just for unoccupied roofs that it is okay.  Similar, but related, I think you can do a ladder/alternating tread up to a loft if it's limited to a certain size.

Nov 11, 21 11:45 am  · 
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