Look for groups of replacement slates or tiles
A few replacements are normal on an old roof. Several concentrated in one area can show where previous trouble has occurred.
Check roof shape as well as covering
A dip in the slope may point to timber movement or old structural alteration rather than a surface defect.
Think about future access
A chimney above a bay or narrow side passage can make even small repairs expensive to reach.
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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