Dampen the brick before you start laying. Spray the stones that are in the chimney. The ones you lay can be moistened in a bucket. If they are dry, they will draw moisture from the mortar.
Thanks for the quick replies 😊 Do I need to remove the actual pipe that goes up into the chimney?
No, but it's not a bad idea to seal the chimney top, so it doesn't rain in, and otherwise it's an open residence for new tenants, crows/jackdaws. They are quick to move in.
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