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Termination positioning - Building regulations Part J
Information taken from Poujoulat Therminox TI Chimney system guide 2016
Where the Chimney passes through a pitched roof more than 0.6m from the ridge, the horizontal distance between the roof and the chimney termination shall be not less than 2.3m, unless the termination is at least as high as the ridge and 1m above the roof penetration. Where the discharge end of the chimney flue is within a horizontal distance of 2.3m from any other adjoining structure or an opening into building, the termination height shall not be less than 1m above the top of that structure or opening.
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Point where flue passes through weather surface (Notes 1, 2) |
Clearances to flue outlet |
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A |
At or within 600 mm of the ridge
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At or within 600 mm of the ridge
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B |
Elsewhere on a roof (whether pitched or flat)
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At least 2300 mm horizontally from the nearest point on the weather surface and: a) at least 1000 mm above the highest point of intersection of the chimney and the weather surface; or b) at least as high as the ridge.
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C |
Below (on a pitched roof) or within 2300 mm horizontally to an openable rooflight, dormer window or other opening (Note 3)
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At least 1000 mm above the top of the opening.
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D
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Within 2300 mm of an adjoining or adjacent building, whether or not beyond the boundary (Note 3)
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At least 600 mm above any part of the adjacent building within 2300 mm.
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Notes 1) The weather surface is the building external surface, such as its roof, tiles or external walls. 2) A flat roof has a pitch less than 10°. 3) The clearances 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.
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