What mortar should be used to re point leaky chimney

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What mortar should be used to re point leaky chimney? Is it normal building sand, cement and water four to one mix?
How deep you need to go? About half an inch
 
It depends partly on the quality of the bricks - the mortar should always be a little weaker than the brick.
If the bricks are of reasonable quality, a 1:4 mix with a little plasticer should be ok; one-half inch is a little shallow - maybe 20mm?
 

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