New render blown and cracked in places

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Newbie19

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Hi, new to this forum but have recently had the whole back of our Victorian terrace rendered. Old render was hacked off back to brick and then 2 coats of sand and cement render applied. It has been complete about a month and we have just brushed off the loose sand in order to paint and found two bad patches of fine cracks and blown render that sounds hollow when you tap it. One patch extends about 2.5m x 0.5m the other about 1m. Pics of the cracks. There are some other fine cracks on the bottom of one belcast. Feeling gutted and want advice on what's best to do? Am waiting on the company to get back to us and come out to see it (we've paid). Thanks
 
Hi, new to this forum but have recently had the whole back of our Victorian terrace rendered. Old render was hacked off back to brick and then 2 coats of sand and cement render applied. It has been complete about a month and we have just brushed off the loose sand in order to paint and found two bad patches of fine cracks and blown render that sounds hollow when you tap it. One patch extends about 2.5m x 0.5m the other about 1m. Pics of the cracks. There are some other fine cracks on the bottom of one belcast. Feeling gutted and want advice on what's best to do? Am waiting on the company to get back to us and come out to see it (we've paid). Thanks
I seem to have started 2 threads accidentally. These are pics of the cracks.
 

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Sand and cement render went out with the Ark. there are a lot better materials on the market now.
All renders are pretty crap s&c coulered render all crack eventually, then your thin coats and one coat bagged s&c they micro crack too, give me a brick house over a rendered one all day long or even better a nice solid bit of stone work
 
Don't fill the cracks. paint the render with BDEC external paint, the paint will cover the cracks up. have a look at their web page.
 
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