1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 41
[Subsidiary]
(4) The 2 leaves shall be united-
(a) by iron ties so shaped as not to transmit moisture across the cavity and not less than 20 x 3 mm in cross-section, well galvanized or otherwise protected from corrosion; or
(b) by ties of such other materials and cross-section as to comply with the relevant current British Standard Specification.
(5) Such ties shall be built into the horizontal bed joints during erection and placed at distances apart not exceeding 900 mm horizontally and 450 mm vertically.
(6) Such ties shall also be placed at distances apart not exceeding 300 mm (measured vertically) within 150 mm of the sides of all openings.
(7) The cavity shall during construction be kept free from mortar droppings.
(8) In the case of load-bearing walls the cavity shall extend downwards at least 150 mm below the level of the lower damp-proof course of the wall, and in all walls, wherever the cavity is bridged a damp-proof course or flashing shall be provided to direct moisture away from the inner leaf of the wall.
(9) Adequate drainage shall be provided to all cavities through the outer leaf of the wall. The maximum width of any opening for drainage purposes shall not exceed 5 mm.
61. Where glass block/panels are built into walls other than party walls-
(a) the opening into which the glass blocks are built shall be so constructed that no load from the building is transferred to the glass blocks;
(b) the maximum area of a single panel shall be 9 m2 and the maximum vertical dimension shall be 4.5 m in external walls or 6 m in internal walls.
62. Every parapet to an external or party wall shall-
(a) where built of bricks or building blocks have-
(i) a thickness of not less than 225 mm; and
(ii) a height not more than 6 times its thickness:
(b) where built of reinforced concrete have a thickness of not less than 100 mm.
63. (1) The boundary round the site of any building adjacent to a street or scavenging lane shall be provided with a boundary wall or fence not less than 1.8 m in height unless exempted by the Building Authority.
(2) Every boundary wall of bricks or building blocks shall-
(a) be built in cement mortar or cement-lime mortar;
Glass block walls. L.N. 293/76
Parapet walls. L.N. 294/76.
Boundary walls and fences. L.N. 294/76.
1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 41
[Subsidiary]
(4) The 2 leaves shall be united-
(a) by iron ties so shaped as not to transmit moisture across the cavity and not less than 20 x 3 mm in cross-section, well galvanized or otherwise protected from corrosion; or (b) by ties of such other materials and cross-section as to comply with the relevant current British Standard Speci- fication.
(5) Such ties shall be built into the horizontal bed joints during erection and placed at distances apart not exceeding 900 mm horizontally and 450 mm vertically.
(6) Such ties shall also be placed at distances apart not exceeding 300 mm (measured vertically) within 150 mm of the sides of all openings.
!
(7) The cavity shall during construction be kept free from mortar droppings.
(8) In the case of load-bearing walls the cavity shall extend downwards at least 150 mm below the level of the lower damp-proof course of the wall, and in all walls, wherever the cavity is bridged a damp-proof course or flashing shall be provided to direct moisture away from the inner leaf of the wall.
(9) Adequate drainage shall be provided to all cavities through the outer leaf of the wall. The maximum width of any opening for drainage purposes shall not exceed 5 mm.
61. Where glass block/panels are built into walls other than party walls-
(a) the opening into which the glass blocks are built shall be so constructed that no load from the building is transferred to the glass blocks;
(b) the maximum area of a single panel shall be 9 m2 and the maximum vertical dimension shall be 4.5 m in external walls or 6 m in internal walls.
62. Every parapet to an external or party wall shall- (a) where built of bricks or building blocks have-
(i) a thickness of not less than 225 mm; and (ii) a height not more than 6 times its thickness:
(b) where built of reinforced concrete have a thickness of not
less than 100 mm.
63. (1) The boundary round the site of any building adjacent to a street or scavenging lane shall be provided with a boundary wall or fence not less than 1.8 m in height unless exempted by the Building Authority.
(2) Every boundary wall of bricks or building blocks shall-
(a) be built in cement mortar or cement-lime mortar;
Glass block walls.
L.N. 293/76
Parapet walls. L.X. 294/76.
Boundary walls and fences. L.N. 294/76.
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