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CMU wall with Efflorescence.

What is Efflorescence

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Efflorescence.  What a weird word.

Efflorescence – ef-flo-res-cence (ef∋ le res∋ens), 1. a change on the surface to a powdery substance upon exposure to air, as a crystalline substance through loss of water. 2. to become encrusted or covered with crystals of salt or the like through evaporation or chemical change.

In English, efflorescence is that white, powdery stuff that you see on masonry walls.  Because this isn’t a chemistry class, we are going to focus on prevention and remediation, instead of causation.

Although efflorescence is ugly and sounds scary, prevention and removal are simple and inexpensive.

How to prevent efflorescence

This is very easy.  Make sure that the masonry substrate is  at least 14 days old.  If it seems uncured or “hot”, wait another week.  Then, prime it using a masonry primers.  Sherwin Williams makes a great product called Loxon Primer.

Once you have primed, simply apply an appropriate top coat and you are done.  If you followed all of the manufacturer’s instruction, you should not have any problems with efflorescence.

How to remove efflorescence.

This is more difficult than prevention, but it isn’t a huge problem.  First off, efflorescence is a cosmetic problem.  It does not degrade the monolithic strength of the substrate.  The efflorescence on the wall pictured above is ugly, but it won’t hurt the wall.  So if you have efflorescence and it doesn’t bother you, leave it alone.  If its unsightliness does bother you, here is how you fix it.

  1. Clean the efflorescence with muriatic acid.  Be careful; hydrochloric acid is nasty stuff.  You may need to dilute depending on the molar strength.
  2. Scrape the efflorescence.
  3. Make sure you have rinsed all of the muriatic acid and allow everything to dry thoroughly.
  4. Prime and repaint using the system described above in the “prevention” section.

I hope that you were entertained while reading this riveting expose` on efflorescence.

GreenWave is also the best interior house painters, exterior house painters, and house painting company and serves Atlanta, Alpharetta, Brookhaven, Buckhead, Chamblee, Doraville, Dunwoody, Grant Park, Inman Park, Johns Creek, Duluth, Milton, Roswell, and most major suburbs.

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Exterior Painting Application Methods

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What is the best way to apply paint?

This is another one of those questions that can only be completely answered with the question, “What are you painting?”  In an effort to keep this article from turning into a book, I will answer this question for the homeowner who is getting residential exterior painting.  We will assume that the house is previously painted and the paint is not peeling, cracking or having any other coating failures that will require getting into primers and more advanced painting techniques.  The paint is just oxidized, faded, and it is time to repaint.

Houses are usually constructed from either wood, brick, siding, stucco or a combination of these compounds.  Despite a few exceptions, a high quality exterior acrylic paint will work on any of these substrates provided the existing coating is in good condition.  Paints designed for stucco are thicker and have more elastomeric qualities in order fill hair line cracks and allow for movement.  Some paints designed for wood are self-priming to prevent tannin bleed.

So what is the best way to apply paint to the exterior of your home?

Some painting contractors boast “all work done by hand.”  While this sounds wonderful because of the allure of “handmade” and “handcrafted”, it is not really the best way to have things painted.  Here are the pros and cons of hand brush application of paint:

Pros:

  • No over spray or mess
  • Get into tight areas without having to tapes or cover with plastic or paper
  • No need for respirator or mask
  • Fast, easy clean up

Cons:

  • Slower (higher labor costs or more time painting)
  • Thinner coating of paint (Will wear out and need repainting sooner)
  • Uneven finish (brush marks shows)
  • Manufacturers recommend spraying most coatings

 

The other option for exterior house painting is by using a professional spray machine.  I don’t mean a Wagner paint sprayer you get from Lowe’s for $100.00, I mean a professional Graco, SpeeFlo, or Titan machine that can cost anywhere from $1000.00-$30,000.00.  Spraying paint using the right machine, gun, and tip will render a smoother more even finish than brushing by hand.  In some instances, like painting stucco or applying wood stains, it is necessary to back roll the coating after spraying it on to push the paint into textured surfaces.  Here are the pros and cons of spraying paint (assuming that a skilled professional is using the equipment):

Pros:

  • Thicker layer of paint (lasts longer)
  • Smoother finish and appearance
  • Faster (saves labor costs)

Cons:

  • Creates over spray so protecting eyes, nose, mouth, and property is required
  • Uses more paint due to thicker coating and over spray loss

As a professional painting contractor, I encourage spraying paints whenever possible.  It just renders a better final product.  There are some situations where spraying paint is not feasible due to population, wind, laws, etc.  If you have any questions about painting send the professionals at GreenWave Solutions an email and we will be happy to help you.

 

By:  Daniel Macris

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