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Here are couple of pictures of the external wall of extension in a UK home. There are is a small damage to the render.

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I thought about using the same fillter material that I have used to fill cracks on inside of the house. However, I believe that they will not respond well to the UK rainy season.

What is the proper material to fill in this damage to render of the UK house external wall?

quantum231
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If you don't fix all the loose bits now, you will just have to do each of them as it actually falls off. Once water has got behind it, frost will complete the job.

It looks like a pretty ordinary sand/cement mix, nothing special about it.

If you're intent on doing just a patch-up, something like Exterior Polyfilla will do as good a job as anything. Interior Polyfilla will not.

Tetsujin
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