cement mortar floor toppings are scheduled on the
drawings and specified in other specification
sections, delete reference to protective finish
coating. Walls and floors not specified or
scheduled to receive other finishes must receive the
Protective Finish Coating.
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Prior to application [of plaster, cement mortar topping, or similar wall
and floor finishes specified in other sections,] [of protective finish
coating specified herein] apply a bond coat of metallic oxide waterproofing
mixed in same proportions as specified for second coat on walls and
columns. Prior to bond coat application, thoroughly broom previously
treated surfaces with thick bristle brooms to remove all traces of
unoxidized compound, and dampen with water. Apply bond coat immediately
before finish coat so there will be no premature curing or setting of bond
coat before finish coat is applied.
[3.4.5
Protective Finish Coating
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NOTE: If wall or floor finishes such as plaster or
cement mortar floor toppings are scheduled on the
drawings and specified in other specification
sections, delete paragraphs entitled "Protective
Finish Coating," "Walls and Columns" and "Floors,"
as appropriate. Walls and floors not specified
and/or scheduled to receive other finishes must
receive the Protective Finish Coating.
**************************************************************************
Waterproofed surfaces which are not to receive plaster, floor topping, or
other finish shall receive a protective coating applied directly over the
bond coat.
[3.4.5.1
Walls and Columns
After application of bond coat, apply protective coating to minimum
thickness of 3 mm 1/8 inch. Mix coating in proportions by volume of one
part portland cement to two and one-half parts fine aggregate conforming to
ASTM C 33. Float to smooth, even surface.
][3.4.5.2
Floors
After application of bond coat, apply protective topping of 38 mm 1 1/2 inch
minimum thickness, consisting of one part portland cement, one part sand,
and two parts fine aggregate conforming to ASTM C 33 and proportioned by
volume. Mixing shall be done in a mechanical batching-type mixer for not
less than 3 minutes after all materials have been included, using not more
than 15 liters 4 gallons of water for each bag of cement when floating is
done by machine and 19 liters 5 gallons for each bag of cement when
floating is done by hand. After screeding to established finish lines and
levels, compact and then float with wood floats or power floating machines.
After finish has sufficiently hardened to prevent excess fine material
from being worked to surface, steel trowel to obtain smooth surface free
from defects and blemishes. After topping has set to ring, trowel again to
a burnished finish.
SECTION 07161
Page 10
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