Flue Through Roof Regulations

When installing a new twinwall flue system if the flue exits the roof within 600mm horizontally from the ridge high point of the roof then the flue must extend a minimum of 600mm above the ridge.

Flue through roof regulations.

When fitting a flue there are criteria in place to ensure safety and make sure all units and systems meet the necessary standards. Well the flue which is a term referring to the vent pipe is basically the important component from the furnace that will transport the emission from the combustion heating process to the outside area of the house. Any vertical flue joints if your flue is going through the roof for example must be bracketed with specific flue brackets every 800mm 1000mm. Care should be taken to follow manufacturers installation and safety clearance instructions.

So will probably have to extend it forward and then take it up through the roof. Also at every joint. Typical single storey flue system through framed chimney with cap flashing flat ceiling with open roof cavity space and pitched roof. The distance between the cowl of the flue and the adjacent roof wall structure should be higher than 2 3 mtr.

Illustrations of proper gas fired water heater venting using type b double wall vent pipe through a roof above or through a chimney below include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1 4 per foot of horizontal run. This means that the flue outlet needs to be positioned sufficiently high above the roof surface and surrounding buildings to prevent it being affected by wind eddies or downdraughts. The flue will be about approx 2100 mm above floor level which will be tricky to hide within a roof space and would be touchable from inside. So is this permissible or does it have to be boxed in.

Boiler flue regulations safety first is an adage that should always be applied to boiler installation. A maximum of 4 bends up to 45º angle is allowed. And there s a very good reason for this. You don t have to worry about any toxic gas or combustion byproduct that will linger inside the house if you have the flue.

Vertical flue joints in attics must be bracketed. As they pass through the home up to the roof vertical flues are either boarded over or housed inside a cabinet. The building regulations identify the zone for this but any of these dimensions may need to be increased where there is exposure to. If the flue exits the roof further down then it must extend high enough to acheive 2 3m of horizontal clearance.

This is a graphical display of a typical freestanding 150mm diameter flue system.