Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day concerns a nursing home and whether its roof void needs fire detection equipment. It is answered by SELECT:
The void rises to slightly over 800mm in most areas and some areas to 1100mm. BS5839-1:2002+A2:2008 refers to a horizontal void of 800mm. However, I'm unclear whether this refers to the peak height, or average height. Also, I'm unsure as to whether this should be measured from the top of the insulation (which would reduce the void in all areas to below 800mm), from the top of the roof trusses, or from the top of the plasterboard (firebreak from the floor below).
I understand that we/the client should carry out a fire risk assessment to check whether the void would warrant fire detection - however, if we come to the conclusion that it does, it would depend on the void height. Can you please give some guidance on this?
Answer: Generally for a Category L1 system for care homes etc., automatic detectors should be installed throughout all areas of the building - including roof spaces and voids.
You may wish to look further by checking on www.infoscotland.com/firelaw. Also check with local fire officer and local authority in case they specify particular requirements.
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