Bricklaying & Repointing

Is cavity wall causing damp exterior wall but no damp inside?

Anonymous user 28 February 2024 - 3.02 PM

Hi I had fibre glass cavity wall installed 2 years ago by British Gas. I asked at the time if the fact that my gable end wall gets all the windy rain would be a problem - I live in Manchester not on a hill but the gable side does get heavy rain. Was told not a problem and that my pointing is in good condition (it is). Never had any problems until 2 weeks ago and after a very heavy night of persistent rain the next day I noticed that my gable end (side of house) had a two tone brick effect. From top of house to the ground floor window level the bricks were darker and closer inspection saw the mortar was damp and the bricks also damp (but not wet to touch) since then it has been cold, no sun on that part of house and more heavy rain hitting the bricks. Bricks still darker as if damp and mortar is damp if I put a tissue on it. My concern is that the rain has penetrating the brick hit the cavity wall installation material and this is now wet and not allowing my bricks to dry. Inside my house there is to date, no sign of any damp, wetness or cold walls. Or is it that the bricks have just not dried out? Mine is the only house around me in this position to take the rain so can't compare I am really worried about all this so any advice would be greatly received.