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Brick
Old
& Unpainted/To Be Painted/With Elastomeric
a. Surface Preparation:
- if
efflorescence is present, remove by hand wire brushing; wear eye
protection and gloves; try to identify and eliminate any source
of water from behind the brick that could have caused the efflorescence
-
scrape out and widen any cracks; brush out dust, and seal with
100% acrylic or siliconized acrylic caulk; make second application
in several hours if needed; check mortar joints carefully and
repair or re-point as needed; wall and chimney caps must be sound
and continuous; chimney flue should have rain cover
-
treat any mildew with a 3:1 water:household bleach mixture, leaving
it on for 20 minutes and adding more as it dries; wear eye and
skin protection; rinse thoroughly
-
remove dirt, chalk, dust, unbound sand, treated mildew, etc. by
scrubbing with detergent and water, and rinse thoroughly; or power
wash with plain water, taking care to not drive water into cracks
or mortar joints
b. Priming:
- priming
is not essential with quality exterior 100% acrylic elastomeric
wall coating, but priming will aid efflorescence resistance, and
maximize adhesion of the elastomeric coating
- use
quality exterior latex primer that is recommended for masonry
surfaces
- do
not leave a primer unpainted
c. Painting:
- use
top quality exterior 100% acrylic elastomeric wall coating
-
apply two coats for maximum crack bridging and durability
-
apply at manufacturer’s recommended spread rate; for best
performance, this will be 40 - 60 sq.ft./gallon to achieve a minimum
dry film thickness of 7 mils per coat.
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