Is this water ingress normal/problematic?

[cjard]

I've a building where one wall is coursed stone on the outer leaf, there's not much of a cavity (it doesn't look like it was supposed to be a cavity.. more like the wall was filled with stone rubble?) and then an inner leaf of well laid, tightly coursed engineering brick with lime mortar. Vents are built in, a sort of long S shape with an airbrick at the bottom on the outside and an open hole about 4 feet above in the inside

The elevation is very exposed, and one a recent day when the wind was about 60mph and the rain was hammering down I noted that the base of the engineering brick looked a bit damp, and looking inside the vents I could see that the outer stone leaf was running wet on the inside, a bit like one might expect in a cave - a film of surface water on the stone that seemed to be flowing

This entire wall (stone+brick) will form the outer leaf of a conversion of he building to residential, by putting a timber frame box up inside. Should I be looking to re-point or treat the front stone wall in some way to make it more resistant to water ingress? the pointing is in a poor state in places, but for the amount of water that seemed to be inside the stone leaf of the wall, there wasn't a great deal on the inner surface of the engineering brick..

 

[Deluks]

Probably a rare event caused by the unusually harsh weather, 99% of the time it will probably be ok. Given that the cavity is vented, it should be alright.

The new timber frame should be given a breather membrane though, and lap a dpc up behind it if possible. Also 'prufe the bottom few courses of the engi brick.


Note the use of the word 'probably'... I don't think anyone can know for sure, but the detailing of the refurb and good workmanship will cover your ar5e.