1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 49
(2) The height of every chimney stack measured from the level of the highest point of its intersection with the adjoining roof or gutter to the top of the stack, shall not exceed 6 times the least horizontal dimension of the stack unless it is adequately secured against overturning.
(3) The topmost 6 courses of every chimney stack constructed of bricks or building blocks shall be laid in cement mortar, or cement-lime mortar containing not less than 1 volume of cement to every 6 volumes of sand.
(4) (a) Where the height of a chimney stack measured from the level of the highest point of its intersection with the adjoining roof or gutter exceeds 1.5 m, the part of such chimney stack above 1.5 m may be constructed of metal pipes, adequately stayed to resist wind pressure, and with a cross-sectional area not less than that of the cross-sectional area of the chimney stack below, and in any case not less than 150 mm in internal diameter.
(b) Such pipes shall be constructed—
(i) of cast iron, not less than 5 mm thick at any point; or
(ii) of mild steel plates not less than 5 mm thick; or
(iii) if used with a gas-fired appliance, of steel metal of a thickness not less than 3 mm.
(c) All metal in flue pipes shall be protected against corrosion.
77. (1) No timber (other than wood plugs), or other combustible material shall be placed in any wall or chimney within 225 mm of any flue or the inside of any fireplace opening.
(2) No wood plugs shall be driven into any wall or chimney within 150 mm of any flue or the inside of any fireplace opening.
(3) No woodwork or other combustible material of the surround of any fireplace opening shall be fixed round that opening unless it is
(a) distant at least 150 mm measured horizontally and 300 mm measured vertically from that fireplace opening; and
(b) solidly backed with incombustible material.
78. (1) Every chimney shaft built of bricks shall comply with the following provisions—
(a) it shall be constructed of suitable solid bricks jointed with suitable mortar;
(b) it shall be square, circular, or of any regular polygonal shape, and the outer face shall be built to a batter of at least 20 mm in every 1 m of height;
[Subsidiary]
Combustible materials in proximity to chimneys. L.N. 294/76.
Chimney shafts. L.N. 294/76.
1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 49
(2) The height of every chimney stack measured from the level of the highest point of its intersection with the adjoining roof or gutter to the top of the stack, shall not exceed 6 times the least horizontal dimension of the stack unless it is adequately secured against over-turning-
(3) The topmost 6 courses of every chimney stack constructed of bricks or building blocks shall be laid in cement mortar, or cement-lime mortar containing not less than I volume of cement to every 6 volumes of sand,
(4) (a) Where the height of a chimney stack measured from the level of the highest point of its intersection with the adjoining roof or gutter exceeds 1.5/m, the part of such chimney stack above 1.5 m may be constructed of metal pipes, adequately stayed to resist wind pressure. and with a cross sectional area not less thary of the cross sectional area of the chimney stack below, and in any case not less than 150 mm in internal diameter.
(b) Such pipes shall be constructed-
(i) of cast iron, not less than 5 mm thick at any point; or (ii) of mild steel plates not less than 5 mm thick; or (iii) if used with a gas-fired appliance, of steel metal of a thickness not less than V/mm.
(c) All metal in flue pipes shall be protected against corrosion.
77. (1) No timber (other than wood plugs), or other combus- tible material shall be placed in any wall or chimney within 225 mm of any flue or the inside of any fireplace opening.
(2) No wood plugs shall be driven into any wall or chimney within 150 mm of any flue or the inside of any fireplace opening,
(3) No woodwork or other combustible material of the sur- round of any fireplace opening shall be fixed round that opening unless it is
(a) distant at least 150 mm measured horizontally and 300 mm measured vertically from that fireplace opening: and
(b) solidly backed with incombustible material.
78. (1) Every chimney shaft built of bricks shall comply with the following provisions-
(a) it shall be constructed of suitable solid bricks jointed with
suitable mortar;
(5) it shall be square, circular, or of any regular polygonal shape, and the outer face shall be built to a batter of at least 20 mm in every 1 m of height;
[Subsidiary]
Combustible
materials in proximity to chimneys. L.N. 294/76.
Chimney shafts. L.N. 294/76.
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