What to do with the wall of an old property that's been repointed with concrete mortar?

any water ingress into the wall will build up and be trapped behind the cement creating dampness, the way forward is to remove the cement pointing & repoint with H.H.L. mortar, this type of property was designed to allow any water ingress getting in through the brickwork , condensation ect to wick its way-outside to escape naturally through the mortar limes, cement by its very nature does the opposite, your biggest problem is todays tradesmen do not understand how the materials used in the construction of your property all worked together to prevent dampness, modern materials and old material do not work well together as they are trying to achieve opposite things, also this type of property very seldom suffers from rising damp so an injected damp proof course is totally the wrong thing to do, most modern damp proof courses are designed to cover up damp rather than find the source and solve according to which rising damp is misdiagnosed in over 75% of cases rising to 95% in older property's, look for a tradesman the works & specialises in older property's, check out the heritage property's web site or the rising damp myth , try looking up lime mortars plasters to understand more about your property and how it was constructed with materials designed to prevent dampness good luck Alex

Duznt make any diffrence its not the motor pointing that wud cause damp if its old build wants injecting on dpc corse because the damp proof corse may have perished (e.g. tar dpc will perish in time with movement on the build due to no foundations .,built from the ground no conc footings . The pointing is least of ur worries lime was used as a plasticine to make motor more plyable to work with and obviously the colour . U got no worries with 4 to 1 mix .Will not cause damp.

Basically lime is more breathable and does help water and dampness to leave a house especially on the older bricks. The new manufactured bricks it doesn’t really make a difference due to modern building and dpc. Cement also doesn’t fit well with older bricks and may cause them to deteriorate as does it with natural stone. Using lime also reduces chance of cracking

Hi it should be pointed in lime. The bricks need to breathe. Putting air brick in will not do much if anything and will spoil the look of the wall.