Hi laurencarrie,
Thank you for your question.
ThriftyFun.com
http://www.thriftyfun.com/tf445416.tip.html
"My home's stucco is in need of repair. I've heard you should not
paint over stucco, but I know some folks who have done just that. Just
wondering if the reason for not painting over stucco is due to
moisture getting in between the new paint and the underlying stucco.
And, is there any newer type exterior paint these days that would work
well over stucco (after repairing the stucco cracks, of course)? I
find it hard to believe with the technology these days, that someone
has not figured out a way to paint over stucco (must less expensive,
and can be changed easier)."
"I'm an Architect in Houston. You should use an elastomeric paint. We
use this on new stucco as well. It stretches to hide any hairline
cracks that form. It also keeps moisture out."
"Purchase exterior paint with Tricoplex. It's an additive especially
for stucco. It allows the paints to flex with changes in
temperatures."
"When you put regular housepaint over stucco, you have two problems:
#1 the stucco soaks up a lot of paint, and you will need to do several
extra coats in order to get complete coverage, and #2 moisture. We
have insane humidity issues here, and water can get trapped in the
stucco and cause bubbles in the exterior finish or worse, mold
problems!"
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Ask the Builder
http://www.askthebuilder.com/043_Stucco_-_To_Paint_Or_Not_To_Paint_That_Is_.shtml
Paint Stucco - or Not?
Summary: Stucco allows water absorption. Water rots sheathing. Masonry
stain or penetrating finish helps stop water entry and still allows
vapor release to the outside.
"...Untreated concrete and stucco will readily absorb water. Both will
allow water vapor to freely pass thru them.
If a concrete sidewalk or driveway gets wet, it's no big deal.
However, if stucco gets wet for extended periods of time, this
moisture can cause problems. Water may eventually wick through the
stucco and begin to rot the wood sheathing or wood framing members.
Water vapor may be pulled into the house.
This may cause insulation to become wet, drywall or plaster to
crumble, and interior paint to peel. Stucco should have a protective
coating of some type to prevent interior or structural problems to
your home. 50 years ago, the only material available to readily
protect the stucco was paint. Paint is a coating. Because of its
viscosity, it does not readily penetrate things that it covers."
[edit]
"...if stucco gets wet for extended periods of time, this moisture can
cause problems. Water may eventually wick through the stucco and begin
to rot the wood sheathing or wood framing members. Water vapor may be
pulled into the house.
This may cause insulation to become wet, drywall or plaster to
crumble, and interior paint to peel. Stucco should have a protective
coating of some type to prevent interior or structural problems to
your home. 50 years ago, the only material available to readily
protect the stucco was paint. Paint is a coating. Because of its
viscosity, it does not readily penetrate things that it covers. That
is why you are experiencing the peeling problems. Water vapor from the
inside of your house may be pushing the paint off of the stucco. This
is a very common problem on thousands of houses.
Fortunately, advancements in coatings technology have produced
products which will enable you to avoid peeling in the future. If you
are able to remove the paint from your stucco completely, or had it
never been painted before, you would have two alternatives. The
choices available to you are either penetrating masonry stains, or
clear penetrating finishes.
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House - Painting - Info
http://www.house-painting-info.com/masonry-sealer.html
A masonry sealer must do more than seal
"- Clear sealers can deepen or enrich the color of the surface, but
usually will not be visible. These are water sealers and are designed
to repel liquid water and are not waterproofers. Water vapor will
still move through the material.
Water sealers stop liquid water from entering the surface, but allow
water vapor out. They are breathable products that can be applied to
brick, concrete block, stucco or any masonry material.
- Pigmented coatings are very similar to stains in many ways and can
be water sealers or waterproofers. It is possible to change the color
of masonry materials and provide waterproofing at the same time. The
intensity of color can be subtle to solid.
This is similar to semi-transparent and solid color exterior wood
stains. Can be applied to any masonry surface.
- Film forming coatings are more like paint than a stain. Can have a
sheen from satin to gloss. These products are waterproofers and some
can resist water pressure behind the film.
This is very useful for sealing leaky basement walls. As a masonry
sealer, film-forming coating will usually last the longest.
Brush, roller or airless sprayer can apply all of these different
products. Typically spraying is used for an even application, with
back rolling or back brushing immediately following the application.
Before any masonry sealer can be applied to masonry or stucco, the
surface must be cleaned and dry. Pressure washing and some hand
scraping can remove the dirt, mold or peeling coatings.
If its not properly cleaned the sealer or coating will not last.
Don?t rush during cleaning or application. All of these products must
be applied according to manufactures instructions and only to fully
cured masonry surfaces."
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This Old House
http://www.thisoldhouse.com/toh/tvprograms/asktoh/qaarticle/0,16588,350009,00.html
"Although I'm in the business of painting houses, I share your
reluctance about painting stucco; you'll have less maintenance and
expense in the long run if you leave it "raw" and wash it regularly."
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Painting Stucco Exterior
http://ths.gardenweb.com/forums/load/repair/msg0212123311822.html
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The best advice is call your local paint store or home improvement
store such as Home Depot or Lowe's, and ask what they recommend for
your climate and area.
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keyword search:
stucco clear masonry stains penetrating water sealer
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Best regards,
tlspiegel |
