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Roughcast rendering


 
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nielsc

from United Kingdom

Joined: 22 Sep 2006
Posts: 5
Location: Glasgow,
United Kingdom

PostPosted: Fri Sep 22, 2006 7:46 am Reply with quote

I need to do a small patch to a roughcast wall.

I have done quite a bit of searching on the web and there has been a lot of advice. I just want to make sure that I am doing the right thing.

The patch should consist of two layers

1) a scratch coat (3 sharp sand: 1 cement + waterproofer)
2) the rough cast coat (4 sharp sand: 1 cement +waterproofer? + 6-10mm chips

Wet the wall and the put on the scratch coat. 10mm thickness maximum. As it gets drier scratch some horizontal lines in it. Let it dry out.

Can I use any kind of 6-10mm chips for the rough cast coat or do they have to be lime chips? What proportion of chips should I use in the mix?
Do I need waterproofer in the roughcast coat?

Wet the scratch coat and put on the roughcast coat.


Does this sound correct?
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Moz

from United Kingdom

Joined: 19 Jun 2005
Posts: 5141
Location: United Kingdom

PostPosted: Sun Sep 24, 2006 4:03 pm Reply with quote

That sounds ok to me , icon_smile.gif

yes use lime chips...
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nielsc

from United Kingdom

Joined: 22 Sep 2006
Posts: 5
Location: Glasgow,
United Kingdom

PostPosted: Tue Sep 26, 2006 8:39 am Reply with quote

Thanks Moz.

I think I will go ahead now.

Will put waterproofer in both coats, better safe than sorry.
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JohnD

from United Kingdom

Joined: 15 Nov 2005
Posts: 36358
Location: Hampshire,
United Kingdom
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PostPosted: Tue Sep 26, 2006 10:15 am Reply with quote

If you are doong a patch, I take it a small section in an existing wall? it can be difficult to get a match, but if you sweep under the old wall you will probably find plenty of the stones or chippings that were used before and have fallen off. You might be able to incorporate them in the final layer.
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