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  • First I'd get out there when it's raining and try to get a feel for whether this is water rolling off the roof, or the effect of driving rain, or both. It looks like a lot of damp brick for a minor roofing issue, I would want to attribute it properly before attempting a solution.

    Suspect the side of the house was rendered because of driving rain wrecking the brickwork, but WTF is that white staining coming through?

  • The white bit is the dry bit (I think).

    It's not the right side for prevailing winds so I was quietly hoping it would be runoff from the coping stones on the gable wall and around the edge of the guttering.

    I think you're right though, a trip up a tall ladder in the rain is probably a good idea.

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