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PostPosted: Mon Apr 10, 2017 8:06 pm 
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Hello all, haven't posted here in quite a while but i have a quick question about painting an exterior plinth that goes around the house (c1930s build). Have had the plinth newly concreted in August 2016 and want to paint it and/or consider damp proofing it as it runs around the house at damp course level to ground. (Please see pics) Have had a quick look in the history of similar threads but didn't feel it answered my question.

Want to do the job properly so I was considering an exterior undercoat mixed with pva first to seal concrete (even though guy that did it used pva mix in new render) then an exterior masonry paint to finish off (Black). Am I talking the right method here or do I just consider an off the shelf all in one product that seals, paints and finishes all in one? Am a little bit clueless - just need pointing in right direction. Any recommendations of what products to use / advice gratefully received.

Glad to see UHM still going strong.
Thanks in advance.


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PostPosted: Thu Apr 13, 2017 9:08 am 
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Why not leave it natural?
It looks good!
It is cloaking the brick courses below the DPC level and as such will be naturally damp. In its present state it can 'breathe' and any moisture escape.
If you waterproof it in any way it could with frosts etc. eventually detach itself from the brick-work.
Although I am interested in seeing what other people think!


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PostPosted: Thu Apr 13, 2017 9:16 am 
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Probably better asked in Painting & Decorating. I'll move it.


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PostPosted: Thu Apr 13, 2017 11:27 am 
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I thought that too. But at least now you do have a builders point of view!



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PostPosted: Thu Apr 13, 2017 12:42 pm 
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Whatever you do, do NOT put PVA on it as that will cause any paint you put on it to blister and peel off. (See the PVA thread at the top of the Painting and Decorating index.

Paint it with a proper masonry paint. No need for an undercoat or primer, UNLESS the surface is very powdery, which I doubt as it's new render. If it is, use something like Weathershield Sabilising Primer.

I use Weathershield Trade. It's available in black. Water down the first coat with 20% water and use that as a mist-coat to "prime" the surface, and then paint on two full-strength coats.

The masonry paint will allow it to breath and it contains some sort of fungicide. You'll probably need to repaint it every five years as it will soon become marked, especially with bits and pieces bouncing of the surrounding area when it rains.



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PostPosted: Thu Apr 13, 2017 9:24 pm 
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Many thanks Davyp1 and Tom D'Angler comments noted. Will most likely go with you on that Tom just wasn't sure about the PVA aspect. Knew I'd get a sensible answer rather than being fobbed off in Wickes/BQ :lol:



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PostPosted: Fri Apr 14, 2017 9:43 am 
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I would certainly be leaving it natural. It does look better. The other thing to consider is that the footings always get dirty as rain splashes bits and dust against them regularly and the natural render will help hide this. If you are determined to paint I would go for a self cleaning masonry.

Tape off the brick work and the floor with duct tape to give a good line.

I am a bit surprised that it has been rendered as it looks like it is below the damp proof course which I think should be left breathable??

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