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gillies
@mespilus
Is 'COPPEN' meant to translate as coping stone,
the full width components leading down and away from the chimney stack.
'Granit', (granite?), when crushed into a powder or fine gravels has no particular waterproofing properties.
Any cementitious site mixed grout or mortar will have poor adhesion and will shrink and crack,
leading to further water ingress.
A quality elastomeric sealant will give good unprimed adhesion, bonding to the coping stones with a waterproof seal.
Depending upon ease of access, there's barely a morning's work rebedding those coping stones.