I don't know if you have come accross the above guide:
http://www.bre.co.uk/filelibrary/Water_Mist_Guide_v2.pdf"An Independent Guide on Water Mist Systems for Residential Buildings
This is a guide to water mist systems primarily intended for use by approving authorities, e.g. building control bodies and fire safety officers, to detail current knowledge, improve education about systems, to dispel myths/misunderstandings and to assist them in assessing water mist systems in residential buildings that they may be faced with.
The guide also includes recommendations, cautions and commentary relating to the use of water mist systems for life safety in residential building applications and suggests when it may be appropriate to obtain specialist advice
Download document:
Prepared by
Dr Corinne Williams and Dr Louise Jackman, Principal Consultants, BRE "
Regards
Dave.
