Interesting that although IBC dictates something beyond the scope and  
GUIDANCE of 13R, there is nothing on the design basis for performing  
the calculations.  We did an informal interpretation on it available  
on the database.

Roland

On Mar 25, 2009, at 5:26 AM, Tom Duross wrote:

> I have an existing 4 sty. 13R building, sprinklered, maybe 5 years  
> old.  2
> units/floor.  IBC.
> The small existing cantilevered decks (3x10) are being replaced with  
> larger
> (6x10) ones.
> They're installing outside decks/balconies to the stairs off the  
> sliders
> from the living rooms.
> The stairs will are open and will connect to each deck as a second/ 
> third(?)
> means of egress although the stairs serve the back doors now too.
>
> They're asking me to install dry sidewalls to protect the decks/ 
> balconies
> but I have a few questions.
> 1. Do I have to also protect the stairs (existing but will connect  
> to the
> new decks) if they're open?
> 2. How close to the underside of the deck overhead can I install the
> sidewall?
> 3. What about the top decks that aren't covered?  Just place a head  
> over it?
> 4. What would you guys design this too?  All heads?
> I've got a stack of HVAC closets adjacent to the sliders so I think  
> I can
> run the risers there and just tee off on each floor.
> One contractor has already stated a dry pipe standpipe is required,  
> I'm not
> sure about that.
>
> This isn't my design, just being asked to quote a sketch.
> I asked how close the decks were going to be to the property line  
> thinking
> it might be a protection issue but apparently the building inspector  
> has
> signed off on the new decks providing they hire a sprinkie to put in  
> the
> heads.
>
> Tom
>
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