3.2
SURFACE PREPARATION
3.2.1
Concrete Surfaces
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NOTE: Coordinate with: (1) Division 3, "CONCRETE,"
for surface preparation requirements, continuous
grooves of junction between horizontal and vertical
surfaces, cutting out of wire ties, honeycombs, and
porous areas, installation of anchoring devices,
built-in water stops, and concrete floor toppings;
(2) Division 7, "THERMAL AND MOISTURE PROTECTION,"
for resilient-joint calking and plastic and metallic
flashings; (3) Division 9, "FINISHES," for plaster
or similar wall finish; (4) Division 15,
"MECHANICAL," for watertight connections, for piping
sleeves, and drains; and (5) Division 16,
"ELECTRICAL," to provide that no wiring devices be
installed in recesses until waterproofing work is
complete. Similar notes may be required in other
specification divisions for recessed anchor devices
and other related work.
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Roughen concrete wall and floor surfaces by light bushhammering,
sandblasting, acid etching, or high pressure water cleaning to provide
firm, unspalled granular surface, clean and free from loose materials,
debris, and detrimental substances such as dust, dirt, oil, grease, or
other coatings. [Cut out wire ties to depth of 38 mm 1 1/2 inches. Cut
out holes, honeycombs, open joints, and porous areas. Make all cuts square
to a depth of 25 to 38 mm 1 to 1 1/2 inches. Do not cut V-grooves or
cone-shaped recesses.]
3.2.2
Walls
Clean wall areas that have been cut out, moisten with water, and fill flush
with a stiff mortar mix composed of one 42.6 kilogram 94 pound sack of
portland cement, 85.3 kilograms 188 pounds of sand, and 6.8 kilograms 15
pounds of metallic oxide waterproofing compound. Apply filling and
patching in layers not exceeding 19 mm 3/4 inch thickness, worked into
voids, compacted, and finished flush with adjacent surfaces. Roughen
patched areas to provide level, firm, granular surface.
3.2.3
Grooves, Joints, and Intersections
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NOTE: Insert appropriate Section number and title
in the blank below using format per UFC 1-300-02.
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Strip, clean, and remove all loose material from construction joints,
grooved recesses, and intersections of vertical and horizontal surfaces.
Pack joints with waterproofing mortar mixed in proportions of one 42.6
kilogram 94 pound sack of portland cement and 85.3 kilograms 188 pounds of
sand, and 6.8 kilograms 15 pounds of metallic oxide waterproofing compound.
Finish compacted mortar flush with adjacent surfaces; finish internal
angles to a round cove. Grooves in construction joints, at intersections
of horizontal and vertical surfaces, and fillers and water stops for
expansion and contraction joints are specified under [_____].
SECTION 07161
Page 8
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