Construction and Materials
()) Thickness of janeri
leaf of solid or
Minimum thickness in inches (excluding plaster)
for period of
2
hours. hours. hour. hour.
I
5
Table B-Floors and Landings.
Minimum thickness in inches for period of
Construction and Materials
4
2
1
In this Table ¦--
hollow comerete blocks of Claas Į Aggregate
3
(ii) Thickness of inter
kar of hollow clay or solid or hollow concrete blocks of Čkurs 2 Aggregare
3
Class 1 Aggregate means foamed slag, punice, blast furnace dag. crushed brick and burnt clay products, well burned clinker, crushed limestone.
Clape 2 Aggregate means fint, gravel, granite and all crushed natural
stones other than limestone.
Table Ari-Hollow stud partitions.
Minimum thickness of plaster in inches on
each face for period of
1
Construction and Materials
4
|
Portland cement plaster,
Portland cement-lime
plaster or gypsum plaster.....]
STEEL OR TIMBER
STUDDING,
Plaster on metal
It
with or without!
inch thick plaster board on each side
or timber lathing
Plaster board
gypsum plaster
bours. bours. hour. hour.
16
CERT,
okude
[POS
inch thick perforated
plaster board on each side......
Two inch thick plaster
boards on each side
Ni
T
+ inch thick plaster board on
cach sido ...............agangan pengama
Nil
inch thick plaster board on each side
Nil
Fille Joist ConstrucTON.
Thickness of concrete
Concrete cover on bottom of joist
SOLID REINFORCED CONCRETE CONSTRUCTION (including flat slab construction and floors constructed of precast loverted "U", channel or T-sections, without a ceiling or saffit).
Thickness of concrete
Concrete cover to reinforcernent
HOLLOW Block Floor CONSTRUCIKON (includ-
ing floors constructed of precast concrete units of box-section or 1-section).
Aggregate thickness of incombustible
material (excluding ceiling finishes (if any)]) Concrete cover to reinforcement
STRUCTURAL TIMBER CONSTRUCTION.
Boards 7/8 inch thick on timber joists not less
than 7 inches deep by 2 inches wide,
(a) Tongued and grooved boards with
ceiling of:
(1) timber lath and plaster.
Thickness of plaster
(ii) metal lath and plaster.
Thickness of plaster
(ii) two layers of plaster-board, each
of minimum thickness
(v) one layer of plaster-board of
minimum thickness
(v) one layer of plaster-board of
minimum thickness of 3/8 inch covered with gypsum plaster of minimum thickness
(6) Plain edge boarding with ceiling of:
() metal lach and plaster. Thickness of plaster
(00) timber lath and plaster with
plaster of minimum thickness of 5/8 inch, covered with sheets of plaster-board of minimum thickness
hours, bours. bour. hour.
LA
+
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