3.2.3
Compatibility
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NOTE: Verify requirements below based on
compatibility of treatment and sealants. Use one or
both the second and third following paragraphs as
required.
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a.
Confirm treatment compatibility with each type of joint sealer
within or adjacent to surfaces receiving water repellent treatment
in accordance with manufacturer's recommendations.
[b.
When recommended by joint sealer manufacturer, apply treatment
after application and cure of joint sealers. Coordinate treatment
with joint sealers.]
[c.
Mask surfaces indicated to receive joint sealers which would be
adversely affected by water repellent treatment where treatment
must be applied prior to application of joint sealers.]
3.3
MIXING
Mix water repellent material thoroughly in accordance with the
manufacturer's recommendations. Mix, in quantities required for that days
work, all containers prior to application. Mix each container the same
length of time.
3.4
APPLICATION
In strict accordance with the manufacturers written requirements. Do not
start application without the manufacturer's representative being present
or his written acceptance of the surface to be treated.
3.4.1
Water Repellent Treatment
3.4.1.1
Spray Application
Spray apply water repellent material to exterior [concrete,] [plaster,]
[and masonry] surfaces using low-pressure airless spray equipment in strict
accordance with manufacturer's printed application, instructions, and
precautions. Maintain copies at the job site. Apply flood coat in an
overlapping pattern allowing approximately 200 to 250 mm 8 to 10 inch
rundown on the vertical surface. Maintain a wet edge at all overlaps, both
vertical and horizontal. Hold gun maximum 450 mm 18 inches from wall.
3.4.1.2
Brush or Roller Application
Brush or roller apply water repellent material only at locations where
overspray would affect adjacent materials and where not practical for spray
applications.
3.4.1.3
Covered Surfaces
Coat all exterior [concrete,] [plaster,] [or masonry] surfaces including
back faces of parapets, tops of walls, edges and returns adjacent to window
and door frames, window sills, and free-standing walls.
SECTION 07190
Page 15
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