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AquaMagic

  • Posts: 563
Concrete Slabs and Render
« on: October 07, 2007, 01:18:55 pm »
Hello, my bro in law, laid some concrete slabs and has since build a small wall which he rendered with Sharp sand and concrete, now its all dry he wants to clean the slabs down, he has access to a powerfull pressure washer from work but wondered if we need and chemicals, and would a wirebrush be too abrasive?

many thanks

Dene
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Kwackers

  • Posts: 700
Re: Concrete Slabs and Render
« Reply #1 on: October 07, 2007, 02:43:03 pm »
Did some with a cold pressure washer and it came up fine.

used a bit of watered down brick acid, left it for 10 minutes then washed it off, took a while though
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*Chris Browne

  • Posts: 863
Re: Concrete Slabs and Render
« Reply #2 on: October 07, 2007, 02:45:21 pm »
I did some chemical free pressure cleaning of slabs, recently and they came out fine.


Chris
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Kwackers

  • Posts: 700
Re: Concrete Slabs and Render
« Reply #3 on: October 07, 2007, 06:59:03 pm »
Be Better if you had hot water on it.
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steve doyle

  • Posts: 287
Re: Concrete Slabs and Render
« Reply #4 on: October 08, 2007, 01:27:22 am »
If you are using acid, dilute it down, but before you put it on , wet the area down so the flags dont absorb it.

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