Failure of traditional slate roof coverings

Technically reviewed by Savas Bulduk BSc (Hons) MRICS, Director & Chartered Building Surveyor · last reviewed 2026-07-20. General information only — not a survey of a specific property.

What it means

Natural slate roofs reach the end of their service life when fixings corrode (nail sickness), slates laminate or crack, or laps and flashings fail. Water then enters the roof void and can stain ceilings and decay timber, particularly on older London pitched roofs with original or poorly maintained coverings.

What you might notice

Missing, slipped or cracked slates
Daylight visible through the covering from the loft
Rust-stained nail heads or widespread fixing failure
Ceiling staining beneath valleys, hips or deteriorated flashings

Guided starting points for this topic

Use one of these focused questions to decide what to read next.

Ceiling stains after rain

Recommended next step

The proportionate instruction depends on the building, the concern and what an inspection can reasonably establish. HCS confirms the scope before you book.

Speak to a surveyor first

We confirm the proportionate instruction before quoting.

Also consider

Instruct a RICS Level 3 Building Survey — Detailed survey for older, altered, listed, non-standard or defective London property.
Not sure Level 2 or Level 3? Use the survey chooser — Use the live HCS tool for an indicative comparison, then confirm the scope before instruction.
Instruct a building pathology / defect survey — Cause-led diagnosis for a defined damp, leak, crack or fabric problem — not a full purchase survey.

Related HCS services and area guides

Sources and evidence

These references are background sources. They do not establish the cause or condition of a particular property.

Historic England — Repair or Renew the Roof in an Older Home · checked 2026-07-20
RICS Home Survey Standard · checked 2026-07-20

Ask a surveyor

Not sure what this means for your property? Speak with a Chartered Surveyor atHampstead Chartered Surveyors & Building Consultancy.

General library guidance is not a survey of your building. A short conversation helps confirm the proportionate next step.

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