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Plastering & Rendering

Paint problem on thin coat silicone render

Anonymous user 28/02/2024 - 3.43 PM

I had my garden wall rendered with a white thin coat silicone render last year. The wall suffers from a damp problem and so the render needed to be breathable. I was initially advised that when it needed painting,I should use a silicone paint, so I bought a tub of EWI silicone paint to use the following spring. During last winter,the wall became dirty in places due to water running down the grout lines of some tiles which were laid on the top of the wall and running down the render. I couldn't wash these off and so touched them up with some of the silicone paint,intending to paint the wall in the spring with the same paint. However,I don't like the finish of the paint which has a different texture to the rest of the wall. I have just had the whole wall painted with Dulux weathershield masonry paint,hoping that the silicone paint would be covered by it.Unfortunately this is not the case and from the side,several shaded areas can now be seen. Can anyone advise on the best course of action?

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2 Answers

BUILDING AND RENOVATIONS WEST SUSSEX LTD

Rating: 5 out of 5

Chichester

Because Silicone Render is a specialist, breathable render, You can use masonry paint on the Silicone Render, however, we always recommend that you ensure it is breathable. Maybe look at the coping layout and try to divert the water elsewhere. Regards www.buildingandrenovations.co.uk

Answered4 July 2020

Anonymous user

Yes firstly you cannot paint on silicone it will not last also the silicone paint will not allow the wall to breath. I think in this case it would be best to remove the existing render back to the original brickwork. Secondly if you need the render to breath then the best way is to use a lime putty render with animal hair goat or horse, The mix is sharp sand, Animal hair and lime putty, Water added, This is normally a 2 coat and followed by a third coat of lime putty and fine sand with animal hair applied if required. This method of lime render is not advised to be carried out in the winter months as the cold and frost will prevent the render from drying. The top of the wall really needs to be topped with coping stones to allow the water to run off away from the wall or 2 layers of tiles laid flat with a brick on edge and a mortar fillet from bottom of the bricks to top of the tiles again so the water will drip away from the wall. There are many types of coping stones and decorated bricks ie engineering bricks are a non porous brick onto a flat tile which is ideal for capping off tops of walls.

Answered22 April 2019