B 128
[Subsidiary]
CAP. 123] Building (Construction) Regulations [1985 Ed.
Minimum thickness of protection in mm for
period of
Construction and Materials 2 hours 3 hours 4 hours 5 hours Gypsum plaster on 19 mm gypsum plaster board with 1.6 mm diameter wire binding at 100 mm 4 12.5 19 25 2 layers of metal lathing plastered with gypsum plaster on each layer, each 2 Precast concrete consisting of 4 volumes of vermiculite to 1 volume of Portland cement, reinforced with expanded metal, wire mesh or with 1.6 mm diameter wire binding at 100 mm pitch 1 65 Beams Moulded asbestos bound in position with nicrome wire not less than 1.6 mm diameter in thickness, the wires to be sunk in grooves not less than 3 mm deep in the outer surface of the asbestos and the grooves and all joints in the asbestos to be filled with refractory cement $ 40 25 25 Cement plaster or cement-lime plaster on metal lathing 25 19 Cement plaster or cement-lime plaster on metal lathing with reinforcement over the rendering coat 22 16 Gypsum plaster on metal lathing Gypsum plaster on 9.5 mm gypsum plaster board with 1.6 mm diameter wire binding at 100 mm pitch Gypsum plaster on 9.5 mm gypsum plaster board supported on wood battens Gypsum plaster on 19 mm gypsum plaster board with 1.6 mm diameter wire binding at 100 mm pitch 12.5 Precast concrete consisting of 4 volumes of vermiculite to 1 volume of Portland cement, reinforced with expanded metal, wire mesh or with 1.6 mm diameter wire binding at 100 mm pitch 12.5 (neat, single coat) 5 25In this Table:-
"Solid Protection" means casing which is bedded close up to the steel without any intervening cavities and with all joints in that casing made full and solid. "Hollow Protection" means that there is a void between the protective material and the steel. All hollow protection to columns shall be effectively sealed at each floor level.
Reinforcement--where reinforcement is required in this Table, that reinforcement shall consist of steel binding wire not less than 2.5 mm diameter, or a steel mesh weighing not less than 0.5 kg/m2. In the case of concrete protection, the spacing of that reinforcement shall not exceed 300 mm in any direction.
B 128
[Subsidiary]
CAP. 123]
Building (Construction) Regulations
[1985 Ed.
Minimum thickness of protection in mm for
period of
2
3
4
5
Construction and Materials
4
2
1
$
Gypsum plaster on 19 mm gypsum plaster board with 1.6 mm diameter wire binding at 100 mm ..
2 layers of metal lathing plastered with gypsum
plaster on each layer, each.
Precase concrete consisting of 4 volumes of vermiculite to I volume of Portland cement. reinforced with expanded metal, wire mesh or with 1.6 mm diameter wire binding at 100 mm pitch
Beams
Moulded asbestos bound in position with nicrome wire not less than 1.6 mm diameter in thickness. the wires to be sunk in grooves not less than 3 mm deep in the outer surface of the asbestos and the grooves and all joints in the asbestos to be filled with/refractory cement
Cement plaster or cement-lime plaster on metal
lathing
Cement plaster or cement-lime plaster on metal
lathing with reinforcement over the rendering;
coat
Gypsum plaster on metal lathing
Gypsum plaster on 9.5 mm gypsum plaster board with 1.6 mm diameter wire binding at 100 mm pitch
hours hours hour hour
12.5
19
25
65
40
25
25
19
25
22
16
Gypsum plaster on 9.5 mm gypsum plaster board!
supported on wood battens
Gypsum plaster on 19 mm gypsum plaster board With 1.6 mm diameter wire binding at 100 mm pitch
12.5
Precast concrete consisting of 4 volumes of
Vermiculite to I volume of Portland cement. feinforced with expanded metal. wire mesh or with 1.6 mm diameter wire binding at 100 mm bitch
12.5
5
(neat.
single
coat)
25
In this Table:-
"Solid Protection" means casing which is bedded close up to the steel without any intervening cavities and with all joints in that casing made full and solid. "Hollow Protection" means that there is a void between the protective material and the steel. All hollow protection to columns shall be effectively sealed at each floor level.
Reinforcement--where reinforcement is required in this Table, that reinforce- ment shall consist of steel binding wire not less than 2.5 mm diameter, or a steel mesh weighing not less than 0.5 kg m2. In the case of concrete protection. the spacing of that reinforcement shall not exceed 300 mm in any direction.
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