A ceiling stain has appeared
Water may have travelled along felt or timber before it reached the plaster.
Older Stockport roofs often still use natural slate, and the slate itself can remain sound long after the original nails have started to corrode. On later tiled roofs, failures are more likely to involve cracked tiles, lost nibs, ridge fixings or junctions around extensions and roof windows.
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Water may have travelled along felt or timber before it reached the plaster.
One failed nail is a local repair. Repeated slips can mean the fixings across the slope are deteriorating.
Rear gutters, side soakers and open mortar joints can all leak out of sight from the pavement.
The blockage may be at the outlet several metres away, with water escaping at the lowest point.
The water may be coming from the wall or sill above rather than through the middle of the bay roof.
A slate can shift without falling and lose enough overlap to admit driven rain.
Historic England records slate roofs on a number of older Stockport buildings, including Woodbank Villa and the museum in Vernon Park. Stockport Council's Heaton Moor character appraisal describes a broader mix of Welsh blue slate, local clay roof tiles, brick, terracotta, bay windows and large chimneys.
Natural slate, clay tile and modern concrete tile do not fail in the same way. Natural slate can remain usable after nail failure, while clay tiles are more likely to crack, spall or lose their nibs. Gables, bays and large chimney stacks also introduce more valleys, flashings and roof edges where water can get in.
Older slate roof repairs in Stockport · Heaton Moor roof repairs

Why sound slates can outlast their original nails.
Slate, clay tile, bays, gables and larger chimneys.
Older terraces, slate fixing failures and chimney details.
Why a small split can produce a large leak.
Check above the frame before blaming the window.
Why access can cost more than the replacement material.
What the loft can reveal that the street view cannot.
Judge the spread and frequency of failures, not age alone.
Areas within the Stockport borough include Bramhall, Cheadle, Cheadle Hulme, Edgeley, Gatley, Hazel Grove, Heald Green, the Heatons, Marple, Offerton, Reddish, Romiley, Bredbury, Woodley, Davenport, Cale Green, Woodsmoor and High Lane.
Separate local roofing notes are only used where there is enough published building information to say something useful about the area rather than inventing a difference between suburbs.
Victorian and Edwardian terraces, pitched roofs and chimneys recorded by Stockport Council.
Traditional Victorian and Edwardian red-brick buildings in the district centre.
A roofscape that varies significantly along the district centre.
Traditional roofing materials and more complex suburban roof forms.
Historic terraced rows and traditional Victorian architecture.
Traditional Victorian terraces alongside buildings of different heights and forms.
Victorian red-brick terraces and prominent chimney stacks around Houldsworth Square.