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Handysyl 09-29-2013 01:11 PM

Repair deteriorating cement on exterior cement foundation
I was scraping the foundation of my home to get ready to paint it. When doing so the cement was crumbling off and I noticed a number of places where there are small fist size indents in the exterior wall. Thy are painted as well.The house was built in 1921. I recently bought it.

nealtw 09-29-2013 01:58 PM

The paint is likely the problem. Concrete needs to breath as it will wick moisture up from ground and if moisture is held in with paint it will be subject to frost damage.
Can you post some photos?

Handysyl 09-29-2013 02:17 PM

2 Attachment(s)
I will

Attachment 5561

Attachment 5562

try to share 2 photos.

nealtw 09-29-2013 03:12 PM

I'm not the expert here but I think it would be better with out paint, repaired and covered with something that looks good that can breath ( stucco or something like that).

Handysyl 09-29-2013 03:27 PM

Ok. I will check with a building supply store. I may end up going with paint just ensure it protected throughout the winter. It may end up bring a bigger job.

nealtw 09-29-2013 03:38 PM

It wants to be a breathable paint or you could be making it worse. Something like this.

mudmixer 09-29-2013 09:51 PM

Even if it breathes, too many coats can make it a very good vapor barrier and more problems.


BridgeMan 09-30-2013 09:43 PM

Looks to be light surface scaling. Remove all unsound areas and all of the paint, and then give it a good coat or two of Thoroseal. I don't think you'll find it at most big box stores, so you may have to go to a masonry supply place.

P.S. Cement is a fluffy gray powder that comes in bags or bulk. It is one of the ingredients of concrete, which your foundation is made of.

Handysyl 10-01-2013 12:19 PM

So what I needed to move forward and prepare the exterior walls for winter. I have prepared the walls including sealant. I used the surface covering recommended and painted. Next year I will. Get a professional. What expertise should I seek?

mudmixer 10-01-2013 01:19 PM

Bridgeman -

I agree with the concept of using Thoroseal for many applications even with a latex additive. Quite simply, it is a cementitous coating that bond well and even becomes a part of the concrete and even work reasonably well over the paint-type coating.

With several coats, the timing between the Thoroseal coats is important to achieve a bond between the first coat while it is active and the second coat. Also the mixing procedure is important to allow the mix to "fatten up" before the final water and application over a moist surface.

I have specified it as a coating on dam repairs and architectural repairs of numerous projects.


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