Forums > Specific Focus > Home, Garden & Construction in Mexico

sparks

Feb 4, 2002, 9:44 PM

Post #1 of 4 (3567 views)

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applying stucco over old brick

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how do you cover those ever present brick sidewalls and rear walls that so many times are left forever. seems like it would not adhere to very old dry surfaces. certainly can't apply a wire mesh at such a late date.

Ken in Maz

Feb 7, 2002, 7:27 PM

Post #2 of 4 (3566 views)

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applying stucco over old brick

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There should be no problem applying stucco over old bricks,unless they have been painted. If so the albanil will use a hatchet and make thousands of chips in the brick surface for the stucco to adhere to. Mesh is not necessary unless the stuco will be an inch or more in thickness,which would be very unusual.

sparks

Feb 9, 2002, 5:57 PM

Post #3 of 4 (3565 views)

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applying stucco over old brick

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Hmmm ... guess I thought the dry bricks and grout would suck the moisture out of the stucco making it shrink and crack. I've heard you need to be careful on the sunny side of a house .... maybe keeping it damp and or covering it.

Esteban

Feb 25, 2002, 9:55 AM

Post #4 of 4 (3567 views)

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applying stucco over old brick

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There is MUCH more to it than meets the eye, if you do it correctly and want it to last. It involves a variety of chemicals. First, in some places, you will use a chemical to draw out the salt from the existing mortar. This chemical is called anti-salitre. Then after you chip the old flaking morter off the wall and uncover any steel re-inforcement, you should paint the steel with some anti rust paint. Then there is a product that should be painted on the surface of the existing wall that acts to help the next coat of cement bond to the old wall. Then you should be putting on a coat of cement/sand/bonding agent mixture. Then, depending on the situation, a mixture of certain chemicals that will repel water to keep moisture from going through the wall. Then another one or two finish coats, depending on what texture you desire. Then a paint sealer, then paint.<p>You will find people who will not do the job correctly and will do it dirt cheap, but in the end, you get a cheap job and you'll have problems.