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Cheers.

Thanks for the information. Can I just fill those holes with new mortar if needs be?

Thanks. Why does it crumble away? Is it anything to be worried about and could I just refill it if needs be?

Hey all, I've just had a garage conversion; A wall was built for the new window. I've started to notice black spots appearing on the mortar surface. When I brush it with my finger it falls out. It's only been about 3 weeks since it was done and I don't want it to get worse. What is it, is it...