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
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| The datum for vertical measurement is the point of |
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| discharge of the flue from either the point of discharge |
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| of the flue or 150mm above insulation, whichever is |
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| the lower. |
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| Point where the flue passes through weather surface | Clearances to flue outlet |
| (Notes 1 &2) |
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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: |
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| a) at least 1000mm above highest point of intersection of the chimney with and |
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| the weather surface; or |
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| b) at least as high as the ridge |
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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) |
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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) |
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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 |
| 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
3.5 If there is no existing fireplace or chimney it is possible to |
construct a suitable |
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. |
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