TABLE I
FIRE-RATED CONCRETE MASONRY UNITS
See note (a) below
________________
_______
_______
_______
Pumice
120 (4.7)
100 (4.0)
75 (3.0)
Expanded slag
130 (5.0)
110 (4.2)
85 (3.3)
Expanded clay, shale,
145 (5.7)
120 (4.8)
95 (3.7)
or slate
Limestone, scoria, cinders
150 (5.9)
130 (5.0)
100 (4.0)
or unexpanded slag
Calcareous gravel
160 (6.2)
135 (5.3)
105 (4.2)
Siliceous gravel
170 (6.7)
145 (5.7)
115 (4.5)
TABLE I
FIRE-RATED CONCRETE MASONRY UNITS
See note (a) below
Minimum equivalent thickness
inches for fire rating of:
Aggregate Type
4 hours
3 hours
2 hours
______________
_______
_______
_______
Pumice
4.7
4.0
3.0
Expanded slag
5.0
4.2
3.3
Expanded clay, shale,
5.7
4.8
3.7
or slate
Limestone, scoria, cinders
5.9
5.0
4.0
or unexpanded slag
Calcareous gravel
6.2
5.3
4.2
Siliceous gravel
6.7
5.7
4.5
(a) Minimum equivalent thickness shall equal net volume as determined
in conformance with ASTM C 140 divided by the product of the
actual length and height of the face shell of the unit in
millimeters inches. Where walls are to receive plaster or be
faced with brick, or otherwise form an assembly; the thickness of
plaster or brick or other material in the assembly will be
included in determining the equivalent thickness.
2.5
PRECAST CONCRETE ITEMS
Trim, lintels, copings, splashblocks and door sills shall be factory-made
SECTION 04200
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