SITE REQUIREMENTS

2. FLUE OUTLET POSITIONS

These positions are defined by Document J of the Building Regulations.

IMPORTANT: Seek specialist advice if installing in a dwelling with a thatched roof

Adjacent Building

Terminal

Flue

Vertical

Measurement

Horizontal

Measurement

150mm

max

Adjacent

Building

Insulation

 

 

The datum for vertical measurement is the point of

 

 

discharge of the flue from either the point of discharge

 

 

of the flue or 150mm above insulation, whichever is

 

 

the lower.

 

 

 

 

Point where the flue passes through weather surface

Clearances to flue outlet

 

(Notes 1 &2)

 

 

 

 

A

At or within 600mm of the ridge

At least 600mm above ridge

B

Elsewhere on roof (whether pitched or flat)

At least 2300mm horizontally from the nearest point on the weather surface and:

 

 

a) at least 1000mm above highest point of intersection of the chimney with and

 

 

the weather surface; or

 

 

b) at least as high as the ridge

 

 

 

C

Below (on a pitched roof) or within 2300mm horizontally to

At least 1000mm above the top of opening

 

openable rooflight, dormer window, or other opening (Note 3)

 

 

 

 

D

Within 2300mm of an adjoining or adjacent building, whether or

At least 600mm above any part of the adjacent of building within 2300mm

 

not beyond the boundary (Note 3)

 

Notes:

1) The weather surface is the building external surface, such as it's roof tiles or external walls.

2) A flat roof has a pitch less than 10°.

3) The clearance given for A or B, as appropriate, will also apply.

4) A vertical flue fixed to an outside wall should be treated as equivalent to an inside flue emerging at the nearest edge of the roof.

3. Minimum dimensions - HEARTH

150

500 225

Superimposed Hearth (or area to be free of combustible material)

150Constructional

Hearth

3.2

If this appliance can be installed in an elevated setting it

 

is recommended to increase the 225mm hearth depth to

 

safely contain any falling logs or embers. The higher the

 

appliance is installed the deeper the hearth should be to

 

avoid scorched floor coverings.

3.3

The building must have a suitable load-bearing capacity for

 

the hearth and appliance. Consult a structural engineer

 

for advice before proceeding.

3.4

When fitting into an existing hearth check that the hearth

 

complies with current construction regulations and is at least

 

the minimum sizes shown.

789

3.1The appliance must stand on a non-combustible constructional hearth which is at least 125mm thick with the minimum dimensions as shown in diagram.

3.5 If there is no existing fireplace or chimney it is possible to

construct a suitable non-combustible housing and hearth

setting. The flue must be installed in accordance with all

local and national regulations and current rules in force.

Check if adding a new chimney to your property requires

planning permission.

15

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Yeoman YMMB manual Flue Outlet Positions, Minimum dimensions Hearth, Hearth and appliance. Consult a structural engineer
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