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Technical Advice / Re: Staircase Lobbies ADB 2019
« Last post by Growler on February 18, 2020, 09:56:48 PM »
Anthony, thanks for the reply, all understood
Thanks again.
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Technical Advice / Re: Staircase Lobbies ADB 2019
« Last post by AnthonyB on February 18, 2020, 08:43:38 PM »
Small premises are detailed in their own main section, Section 4, now, page 42, but as you say it now only refers to B, G & 1.

Of course if an existing build it doesn't apply and the DCLG guide (often more sympathetic to existing premises) is the first point of call.

Your solution sounds fair, retrofitting lobbies isn't usually practicable unless  gutting and refurbing anyway.
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Fire Risk Assessments / Temporary Removal of Atrium Smoke Extracts
« Last post by Messy on February 18, 2020, 06:26:34 PM »
I have a 10 storey atrium with medium fire loading at the base. Its a large building with many thousands of occupants. The floors overlooking the atrium  separated by FR glazing and smoke extract fans are installed with automatic louvre intake vents at ground floor level to operate with the AFD.

There are a number of extract fans located at roof level. Due to construction work, it will be necessary to remove all extraction fans for around 6 weeks leaving the atrium without any high level ventilation.

As a risk reduction measure, some reduction (temporary removal) of the atrium fire loading is possible, but not all of it. I would estimate as much as 60 to 70% would be removed.

I am also considering changing the evacuation strategy to simultaneous from phased as holding staff on an upper floor with no extraction in the adjoining atrium concerns me

Smoke control is not an area I am familiar with, and of course there are no drawings or fire strategy available to help me understand the rationale or operation of the system. Even after reducing the fire load & adopting a simultaneous all out evacuation strategy, I am uneasy to have a 6 week period (which is bound to end up 8 weeks + as it always does!!) without smoke extraction

Can anyone suggest any additional control measures as the clock is ticking
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Technical Advice / Staircase Lobbies ADB 2019
« Last post by Growler on February 18, 2020, 12:21:14 PM »
Whist trying to find if a very small office block of Grd, 1st & 2nd floors served by continuous single staircase needs lobbies at each floor, I was looking through my 2007 Volume 2 of AD'B' where I had previously written notes on the subject and suitable assumption had been made i.e 4.34a i.e lobbies required except for small premises as 4.6a to 3.33 etc . Happy with that I went to make the same notes on the 2019 Vol 1 version now under 3.34 and the reference to small premises is no longer there. I recall this was left out on the 2006 version then put back when ADB was amended 2007, anyone know if this has been omitted again in error. (by the way although the  office block in question is  less the 90m2 per floor as its more then ground and first floor; how I read either version is it can't be deemed a small premises as there is no room for lobbies so going for FD30(s) doors and Pt 1 AFD to L3).
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Fire Safety / Re: Aisle width in shops
« Last post by GB on February 18, 2020, 09:21:44 AM »
Thanks Lyle,

I agree in that I am currently using a minimum aisle width of 1000mm (occupancy only around 20 per shop) as each aisle is in effect an exit route. Just wanted to make sure there wasn't another reference somewhere which would allow for the reduction with some of these convenience stores having aisle widths below 800mm.
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Fire Safety / Re: Aisle width in shops
« Last post by lyledunn on February 17, 2020, 09:27:42 PM »
Afraid not but one would have thought you could take a lead from minimum width for corridors.
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Fire Safety / Re: Restricted Occupancy
« Last post by GB on February 17, 2020, 04:02:42 PM »
To close off this post and the case and proposal was approved on appeal.
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Fire Safety / Aisle width in shops
« Last post by GB on February 17, 2020, 03:59:46 PM »
I am reviewing aisle width in shops using PFSG for shops and don't seem to find a reference for aisle width within the shops. There is reference for storage premises where the aisle width can reduce to 400mm however this is obviously for not members of the public.

Does anyone on the forum have a width with a reference for aisle width in shops where members of the public are present?
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Fire Risk Assessments / Re: LGA guidance for flats - change of status
« Last post by AnthonyB on February 12, 2020, 07:05:34 PM »
I'd say that was because it doesn't really go into any of the external issues that were the subject of the many post Grenfell Advice Notes.

As it has been confirmed as still relevant by MHCLG if used in conjunction with the Advice Notes I'd still use it (in lieu of anything better) until it gets updated (if ever, LACORS is supposed to be being  updated but no sign yet!)

Probably backside covering, if it wasn't for MHCLG continuing to support and reference it I get the feeling the LGA would have pulled it fully and dipped out of any involvement in fire safety in the future.
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Fire Risk Assessments / LGA guidance for flats - change of status
« Last post by Fishy on February 11, 2020, 10:37:54 AM »
Not really my field, but I have noticed that the LGA say that their purpose-built flats guidance is "...no longer comprehensive..." - I infer a tendency to distance themselves from it?  Would leave a significant hole in the available guidance if it were to be completely withdrawn?

https://www.local.gov.uk/fire-safety-purpose-built-flats
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