Brick
Previously
Painted/Sound & Continuous/To Be Painted/With Elastomeric
a. Surface Preparation:
NOTE‚ If lead is suspected in the paint, do not attempt to
scrape, sand, power wash, use heat gun, etc., which might put lead
into the environment, but rather contact a contractor qualified
for lead assessment and abatement
- 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, residual particles of paint, 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 helpful but not necessary if existing paint is latex in excellent
condition, unless specified by elastomeric coating manufacturer
- prime
if there is any sign of efflorescence (remove it first) or any
loose paint (remove by wire brushing)
-
use quality exterior latex primer that is recommended for masonry
surfaces
-
do not use elastomeric coating over old oil-based paint
-
do not leave a primer unpainted
c. Painting:
- use
top quality exterior 100% acrylic elastomeric wall coating
-
apply two coats (or one coat if old coating is an elastomeric
also, and is in good condition)
-
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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