My neighbour's dripping roof is causing damp

Question

The side wall of my garage is only about 4 inches away from the side wall of my neighbour’s more recently built garage.

When it rains heavily my garage wall becomes wet. I have been told that this is seepage because the adjoining garage is set slightly higher than mine and tanking might cure the problem. Is that something I could do?

Answer

With only a 4 inch gap I wonder if rainwater from the garage roofs is running down the walls. If there is no gutter I would suggest that, with mutual consent, a gutter should be fixed to bridge the gap just below the roof edges and also any accumulated debris within the gap is raked out in case it is above internal floor level. I doubt that tanking would be the solution. It is better to identify the cause.

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