How can I tell whether a marked exterior wall needs coating or repair?
Cracks, open joints, flaking finishes and damp marks can point to different problems, so check the wall, roof edges, rainwater goods and nearby openings before choosing a finish. A coating may change the appearance but cannot by itself correct a leak or unstable surface. Note where and when marks appear, then establish the source and condition of the masonry. Read about clear coatings as another exterior finish option.
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