Natural slate and clay tile behave differently
Slate failures are often related to nails or local breakage. Clay tiles may crack, spall or lose nibs, so the repair method should follow the actual covering.
Complex roof shapes create more junctions
Gables, bays, hipped sections and large chimneys mean more valleys, flashings and edges where water can enter.
Conservation-area work may need more care
Changing traditional roof materials or prominent roof details can affect the appearance of the building, so like-for-like repair is often the simplest route where the existing material is still serviceable.
Need somebody to price the repair?
Tell the roofer what you have actually seen. Let the inspection decide whether the repair is local or whether a wider section needs attention.
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