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 Post subject: Failed Render
PostPosted: Sun Jul 22, 2018 2:54 pm 
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Last year (Sept) I had the front of my house rendered - traditional sand/cement render was applied over existing brickwork (London red-bricks).

The guys that did it have over 60 years of experience between them, and did a good job with an excellent finish. Previously they've rendered at the rear of my house, plus plastered most of it, and there's not been a single fault with the previous work which was done in 2011.

This week I noticed a lot of hair-line cracks and the render is sounding hollow over the majority of the wall.
It obviously needs to come off and redone. Now the builder claims that because the wall is south facing and we've had such a dry/hot summer, that's the reason for the rendering failing. I'm not so sure I agree.
But given the experience of the plasterers, is there any other reason for the failure that couldn't be anticipated:

- Suction of moisture by bricks?
- Dodgy batch of sand?
- Problem with any bonding agent they used in the mix?
- Or is it the weather (cold winter, hot summer, lack of flexibility in the render?)

Would people recommend going for a silicon render instead? The south wall does get battered by sun and rain as it's quite an open location.

Many thanks


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