Rank: New forum user 
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Hi,
I wondered if anyone could help me with a query regarding a service riser cupboard and whether it should have compartmentalisation between floors?
One colleague says it should and another believes that if the cupboard is locked then the riser is deemed to be 1 compartment and therefore does not require fire stopping between floors.
I have tried to read through Approved Document B, section 8 and 10 but am going round in circles and would really appreciate anyones thoughts/guidance on this?
Thanks
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Rank: Super forum user 
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What rating is the door? No rating indicates a level compartmentalisation, rating indicates the service duct is considered a single compartment.
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Rank: Super forum user
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What rating is the door? No rating indicates a level compartmentalisation, rating indicates the service duct is considered a single compartment.
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Rank: New forum user
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Hi - I have been told its 60 mins, although I am waiting confirmation. Thanks for your comment
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Rank: Super forum user 
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Regardless of the outer door rating there should be fire stopping between floors. Check the warrantees and conditions in your premises insurance, I think you will find a definition of what your insurers will be expecting.
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Rank: Super forum user
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The last place I worked at was a recentish build (1990’s) and the risers there were shafts running the whole height of the building. There was no way we could put fire stopping between floors, so we treated them as a single fire compartment. The doors to the risers were rated for 1 hour and they were kept locked at all times (own set of keys with only certain people having access to them). Finally, nothing but nothing was kept in the risers. They were regularly inspected to make sure that nobody had gotten a set of duplicate keys and had started to use them as storage space (for fluorescent tubes for example)
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Rank: Forum user 
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A structural survey by a competent person such as a Fire Engineer would confirm the compartmentation in the building.
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Rank: Super forum user
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Originally Posted by: A Kurdziel  The last place I worked at was a recentish build (1990’s) and the risers there were shafts running the whole height of the building. There was no way we could put fire stopping between floors, so we treated them as a single fire compartment. The doors to the risers were rated for 1 hour and they were kept locked at all times (own set of keys with only certain people having access to them). Finally, nothing but nothing was kept in the risers. They were regularly inspected to make sure that nobody had gotten a set of duplicate keys and had started to use them as storage space (for fluorescent tubes for example)
This is an acceptible option in some buildings. However, it may not be advised in a high rise building with sleeping accomidation and a stay put policy.
Also concideration has to be taken as to what is at the bottom of the riser, e.g. a boiler room, battery back up systems, etc.
Edited by user 29 April 2019 22:37:24(UTC)
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