Weathered does not always mean loose
Fine surface cracking can look poor while the component remains secure. Movement and missing bedding matter more.
Preparation decides how long a repair lasts
Fresh mortar needs a clean, stable joint. A thin skin over powdery old material rarely holds for long.
Old brickwork may need a softer mix
Very hard cement-rich mortar can be unsuitable on softer traditional masonry.
Want a roofer to inspect it?
Describe the symptom and the weather conditions in which it appears. A few photographs from safe ground can help.
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