COMMUNITY FORUM

BV001256

11:18PM | 06/07/13
Bvdecor
I own a brick house that was built in the 1920's. The brick is extremely dirty, and the mortar is so weak it blows out when I spray it with a regular hose, let alone a pressure washer. I'm in the process of repointing the entire house with new mortar, and then cleaning the brick using Diedrich 101 cleaner.

I've completed 2 sides so far, and after cleaning the brick I've found that the original color of the brick is more on the orange side rather than red. I wasn't planning on sealing the brick after cleaning it, but now that I'm seeing how light the color is, I'm thinking I may want to apply some type of sealer that will darken the color a bit.

I want to apply a product that will still allow the brick to breath, but, unlike the mainstream thinking, I actually want the product to change the original color darker instead of something that won't change it.

Any suggestions on what to use?

Attached is a picture of a side that has been cleaned and one that hasn't. The color of the clean brick is a little lighter than what the picture shows.

Thanks.


Dsc06873

BV001624

07:04PM | 07/20/13
Something clear that actually wets the brick surface and goes into its porosity will act as a light-pipe and guide sunlight into the pores, instead of all the incident light being scattered off the rough brick surface. That will result in the surface looking darker, and the incident light that is scattered back out of the pores will have been reflected off the pigmented brick inside the pores, and it might be a darker red down inside there.

So; it's got to be clear. The next requirement is that it's got to chemically bond to the brick, so it stays stuck. That pretty-much takes us to two-component epoxy or polyurethane materials.

The next requirement is that it's got to be fairly stable (nothing is perfect) against being degraded by the ultraviolet of sunlight, and for many years. That pretty-much rules out epoxy products, so we're looking for a light-stable 2-part polyurethane.

Paving Brick Sealer from Smith & Co in Richmond, CA is the only one I know of that passes those screens, and thus is likely what you want. It's a high-class chemically cured polyurethane that is super-light-stable. In ten years there's no yellowing, no peeling, nothing. I don't know how long it lasts, and they don't either.
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