which could lead to damage from freezing, mildew,
and efflorescence.
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Units shall have patterned face shell. Face shell pattern shall be
[fluted] [vertical scored] [split ribbed] [_____]. Units shall be
integrally colored during manufacture. Color shall be [_____]. Patterned
face shell shall be properly aligned in the completed wall.
2.4.2.2
Patterned, Decorative Screen Units
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NOTE: Manufacturer's catalogs will be consulted for
patterned units locally available. Optional designs
of patterned units will be shown as necessary for
competitive bidding.
Concrete masonry units conforming to applicable
requirements of ASTM C 129 are suitable for interior
nonload-bearing screens, and may be specified where
required.
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Patterned, decorative screen units shall conform to the applicable
requirements of [ASTM C 90] [ASTM C 129]. Units shall have uniform
through-the-wall pattern, color, and texture.
2.4.3
Fire-Rated CMU
**************************************************************************
NOTE: The thickness of fire-rated walls as well as
the required fire rating will be indicated on the
drawings. Such walls will be shown as continuous
from floor to deck above. Sections and details of
these walls will clearly indicate the extent of such
walls. Solid grouted concrete and concrete brick
masonry 150 mm (6 inches) or greater in thickness
will be considered a 4-hour fire-rated wall
regardless of aggregate type.
**************************************************************************
Concrete masonry units used in fire-rated construction shown on the
drawings shall be of minimum equivalent thickness for the fire rating
indicated and the corresponding type of aggregates indicated in TABLE I.
Units containing more than one of the aggregates listed in TABLE I will be
rated on the aggregate requiring the greater minimum equivalent thickness
to produce the required fire rating. Construction shall conform to ASTM E
119.
TABLE I
FIRE-RATED CONCRETE MASONRY UNITS
See note (a) below
Minimum equivalent thickness in
mm (inches) for fire rating of:
Aggregate Type
4 hours
3 hours
2 hours
SECTION 04200
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