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Thanks John, I’ve tried to add a pic from the inside. The duct is definitely a poor fit as it’s just 4” pipe which sits loose. Strangest that it’s wet inside above the hole too. Think that might be saturation of porous bricks though. I agree a cowl vent would have been better, these are louvre...

Hi all, I’ve got a new build with all sorts of issues but the latest annoyance is a dripping noise when it rains heavily which I believe to be inside the cavity, possibly water dripping down on to the cavity tray as it sounds hollow/plastic. Possibly coincidentally, the noise, though...