How to whiten exterior sides of the house

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Posted by: from Maple
8/25/2016 at 8:16:08 AM

I had purchased this house from a builder a number of years ago. On both sides of the the exterior of the house where the side concrete walls meet the ground, there is a black coating that was pasted on the concrete surfaces. I believe that the black coating was pasted to keep the water away from running into the basement.

How do I whiten the black coating to make it more presentable? The un-pasted portion of the concrete side wall is light greyish which is fine, but I do not like the black coloured portions.

Please look at the pictures.


How to whiten exterior sides of the house
How to whiten exterior sides of the house
How to whiten exterior sides of the house
How to whiten exterior sides of the house
How to whiten exterior sides of the house
How to whiten exterior sides of the house
How to whiten exterior sides of the house
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Date/Time8/25/2016 at 10:13:28 AM

Hello Martin,

There is a couple of things you can try. First you need to find out if it is a water or oil based coating. If you rub diesel fuel on it and it comes off its oil based, if not then it's water base. If water based,, a grinder with a wire wheel will take most of it off. Either way you will need to repaint to make it nice looking. You can never get it all off unless you grind off some of the concrete. Also you could parge the area but again it will look patchy


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Martin in Maple
Date/Time8/25/2016 at 10:40:20 AM

Thanks Gerry.

To make it very easy for me, could I sandpaper the surface? Then paint it with a light grey paint to match with the colour of natural concrete?

Do I use exterior paint for concrete?

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Pete from PnG Builders in Chestermere
Date/Time8/25/2016 at 2:12:49 PM

Your other option is to get the exposed part of the foundation wall finished with parging.

Normally this should have been done as part of the home build.

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Date/Time8/26/2016 at 1:09:55 AM

The only way to properly finish would be to large all exposed concrete as should have been done at build stage. Do it once and do it right.

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