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Waterproofing house stucco

There are many cracks in the stucco covering the outer walls of my house causing rain water, pushed against the walls by the wind, to drip on the back of the drywalls and enter the house from the bottom under the baseboards.
i had gutters and downspouts installed but it didn't help.
i would like to paint the stucco, which now has a natural color finish, with a waterproof paint. i've been told by a friend (not an expert in painting) that he thinks that the process involves applaying first a "base coat" for the waterproof paint to stick to the stucco, then applay the "waterproof" paint which i understand is very thick and finally applay a "sealer" to protect the waterproof paint color against fading since i live in florida. by the way, the present stucco faded after only few years. its color is light yellow and will only one coat of a darker yellow be enough. the house was built 8 years ago and there were no expansion joints installed.
please, i need advice on how to do a good and lasting job.
also, what are the types and names for the "base", "waterproof" and "seal" paints and the recommended name of a company that has developed such types of paints.
finally, how to apply (spray, brush, roll), the approximate amount of square feet a gallon will cover, and the cost of each "base", "waterproof" and "seal" paints's type.
thank you very much. sam

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  • angela reilly Oct 12, 2008

    I have the exact same problem here in New Orleans. My stucco
    Spanish style house was built in the 1940s and the stucco is leaking in
    lots of places. I do not have the money to replace the whole
    thing so I want to waterproof the old stucco. Is this
    doable? Could I replace the bad stucco with stucco-style
    hardiboard and make it blend in with the old stucco?

  • Liam Manning Dec 12, 2012

    I actually had no idea that you could even waterproof stucco. I don't really know much about it in general though. I was hoping to find something about waterproofing in Toronto because my friend needs it really bad. Does anyone have any recommendations?

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First of all, this is a problem the guys from Home Depot wouldn't know how to fix.

Years ago, maybe when this post was originally written you may have needed to do a two coat system.

Your best and actually easiest option will be to power wash your stucco, to remove any dirt from the surface.
Then you will need to mask everything up tight because you're about to spray all the stucco. Cover any concrete and plants nearby, (anything that is closer than 10 feet from the stucco.)

Then go to Sherwin-Williams and purchase Loxon XP this is a one coat system however if you have larger cracks in the stucco you will either want to caulk them with an elastomeric caulk (if you don't have too many) or apply a second coat of Loxon XP. If you're a do it yourself kinda of person you can go to home depot and rent a spray machine. While your spraying your gonna want to back roll it. www.outbackpaintingusa.com

Posted on Jan 28, 2010

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I'd try sealing the cracks first then priming... check with your local Home Depot type place and see if they have any ideas... also it doesn't hurt to just call the experts... sometimes you get that one guy who is willing to tell you WHAT you can do...
If the cracks are NUMEROUS.... then you may need a full re-do of the whole wall. especially if you have internal water damage. you should also ask about interior wall sealing.. there is supposed to be a plastic seal between the outside and inside no matter what your exterior finish is.

Posted on Oct 26, 2008

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