Best mortar for crack in wall

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Hi, I have a crack in the brickwork of an old (80 yrs ?) house.
Had a structural engineer who said its historic.

Whats the best mortar to repair it with please ?
Ive been looking at something called hybrid resin mortar that looks very strong, would that be suitable ?
The bricks are engineering bricks I think.

Thanks
 
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How big is the crack? If its historic then you don't need resin mortar, all you need is something to keep the rain out.
 
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It's wrong to assume mortar needs to be strong, when in fact it needs to be flexible. The strength is obtained from ironing the face to give it it's weathering performance. Too strong and it will damage the brick edges over time, and will be more susceptible to cracking.

5:1 sand/cement plus 1/2 teaspoon of washing up liquid for 1 bucket of mortar.

But often, it's better to just seal it with clear silicone otherwise you see an obtrusive crack repair for ever
 

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