1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 127
[Subsidiary]
TABLE C
STEEL COLUMNS AND BEAMS
Minimum thickness of protection in mm for
period of
2 3 4 5
Construction and Materials hours hours hour hour
SOLID PROTECTION
Columns
Concrete not inferior to that designated Grade III in regulation 19 and reinforced
*The thickness of protection on any projecting cleat, projecting rivet head and the like need not exceed 25 mm.
Solid bricks of burnt clay or sand lime
65* 50* 25 25
75 50 50 50
Solid blocks: reinforced in every horizontal joint
(i) Foamed slag or pumice concrete/ (ii) Gypsum blocks
65 50 $3 50
50 50 皆皆 50
50 50 88 50
Sprayed Asbestos...
50 45. 7.
Beams
Concrete not inferior to that designated Grade III in regulation 19 and reinforced
65* 50* 25 25
*The thickness of protection on the upper surface of the upper flange of an internal beam, and on any projecting cleat, projecting rivet head and the like need not exceed 25 mm.
Sprayed Asbestos ............
-50 15
HOLLOW PROTECTION
Columns
Solid bricks of burnt clay or sand lime: reinforced in every horizontal joint
115 75 50 50
Solid bricks of foamed slag or pumice concrete or gypsum: reinforced in every horizontal joint
75 50 50 50
Moulded asbestos bound in position with nicrome wire not less than 1.6 mm diameter, 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
65 40 125 25
19
Cement plaster or cement-lime plaster on metal lathing with reinforcement over rendering coat ..
25
Gypsum plaster on metal lathing
22 16
Gypsum plaster on 9.5 mm gypsum plaster board with 1.6 mm diameter wire binding at 100 mm pitch
12.5