1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 125
[Subsidiary]
1
Construction and Materials
Concrete blocks
2
Plastered at least 12.5 mm thick
on each side and 1 cell in wall thickness:-
Minimum thickness in mm
(excluding plaster)
for period of
3
4
4
:
hours hours hour hour
Class 1 Aggregate
Class 2 Aggregate
225
115 75 65
225
75
Gypsum blocks
Not less than 70 per cent solid:-
No plaster
100
75
50
Plastered at least 12.5 mm
thick on each side
75
50
50
CAVITY WALL
CONSTRUCTION-
Walls constructed in accordance
with regulation 60:
(a) of solid bricks or blocks of clay, concrete or sand lime:-
thickness of each leaf
(b) with outer leaf not less than 100 mm thick of solid bricks or blocks of clay, concrete or sand/lime:-
(i) Thickness of inner
leaf of solid or hollow concrete blocks of: Class 1 Aggregate
(ii) Thickness of inner leaf of hollow clay or solid or hollow concrete blocks of Class 2 Aggregate
STEEL OR TIMBER
STUDDING-
Plaster on metal
or timber lathing
Plaster board
with or without
gypsum plaster
Portland cement plaster, Portland cement-lime plaster or gypsum plaster
9.5 mm thick plaster board on
each side
9.5 mm thick perforated plaster
board on each side
Two 9.5 mm thick plaster boards
on each side
12.5 mm thick plaster board on
each side
19 mm thick plaster board on each
side
100
100
75
75
19
12.5
(neat, single coat)
12.5
Nil
9.5
Nil
Nil
In this Table:-
Class 1 Aggregate means foamed slag, pumice, blast furnace slag, crushed brick
and burnt clay products, well burned clinker, crushed limestone.
Class 2 Aggregate means flint, gravel, granite and all crushed natural stones
other than limestone.
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