316/1mm stove pipe should always be installed 3 x the internal diameter away from any combustible materials such as plaster board ceilings or wood, e.g: a 6" diameter piece of 316 pipe should be 18" away from combustible materials.
Each joint made should be sealed with fire cement. 316 flue pipe is only to be used as a connecting piece of flue between the appliance (eg: woodstove) and the flue liner or chimney stack.
Download Building Regulations Document J (effective October 2010) below
(Right click link, then select "save file as..")