I am working on a 4-story multifamily building that's above a 1-level parking garage on the ground floor.
The exterior wall is less than 10-ft fire separation distance to the property line, requiring the exterior wall it to be 1-hour fire-resistance-rated.
Since it is an open parking garage, I need a lot of openings within this wall to provide ventilation. Denver has an amendment that allows 50% allowable openings with water curtains per NFPA 13.
Since the parking garage will have a dry system, is this even possible?
It seems like a very odd condition but again I need over 25% opening within the wall to comply as an open parking garage.
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1/19/2023 07:25:08 am
Assuming you're describing a water curtain as outlined buy NFPA 13-16 18.104.22.168, 15.17.2 and 11.3.3 yes you can use a dry system.
Todd E Wyatt
1/19/2023 08:32:35 am
Here is the prescribed requirements for the referenced “Water Curtain’s” per an amendment to 2021 IBC 903.2.11.1.4 :
David T Williams
1/19/2023 09:47:02 am
Often the reason an "open" parking structure is provided is to avoid the costs of fire protection sprinklers and ventilation.... since you already have sprinklers in the structure it would seem that the cost of a ventilation system could be significantly lower than the water curtain you are talking about.
1/19/2023 10:06:09 am
I've done water curtains on dry systems as you describe quite a few times. They are certainly possible. Every time I've done this there has been a code consultant who prescribed the performance requirements (flow, pressure, k-factor, etc.) so I didn't have to come up with them. I recommend you find a consultant to help you with that as well.
1/19/2023 10:09:54 am
I an always confused with the use of water curtains as an alternative to rated fire walls. From an insurance loss prevention perspective, if you need a rated fire wall, it has to be a passive protection, i.e.: independent from your automatic system, including the water supply.
1/19/2023 05:26:09 pm
Yes, providing a water curtain in a dry system is definitely permissible.
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