Flue Through Roof Regulations

How high does the flue have to go.

Flue through roof regulations.

If the flue exits the roof further down then it must extend high enough to acheive 2 3m of horizontal clearance. Above the roof surface with a listed cap or listed roof assembly. A venting system shall be designed and constructed so as to develop a positive flow adequate to remove flue or vent gases to the outdoor atmosphere. The above points only really apply for flues that exit the home horizontally through a wall but that doesn t mean there aren t any regulations if your boiler flue goes vertically out of the roof.

In the loft it will likely need some type of mesh protection. As they pass through the home up to the roof vertical flues are either boarded over or housed inside a cabinet. This flue runs up through your house and exits through your roof. Vertical flue joints in attics must be bracketed.

G2427 6 5 503 6 6 gas vent termination. That means that it will suck air through from your stove which also helps it to burn well. 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. Any vertical flue joints if your flue is going through the roof for example must be bracketed with specific flue brackets every 800mm 1000mm.

A gas vent shall terminate in accordance with one of the following. If the flue passes through bedrooms it should be boxed in with an inspection hatch situated in a specific place. As placement of the vertical flue is more complex and convoluted than a standard horizontal flue it is more costly. A roof or any big object really creates eddies swirling patters of air and areas of high and low pressure which can reduce draw.

The building regulations identify the zone for this but any of these dimensions may need to be increased where there is exposure to. Also at every joint. A vertical flue looks similar to a very small chimney and can be seen spouting out steam when the heating is on. In this case the flue goes upwards and then out through the roof.

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. How far this is will depend on the size of your boiler but is typically between 30 60cm above below or to the side of an opening. And there s a very good reason for this.