12 complete symptom paths42 guides and 60 questions in each1,460 Grade A articlesOne searchable, connected knowledge library140 official sourcesEvidence context with explicit limits
United Kingdom & Ireland House DNA

Early cavity-wall era

Cavity walls, suspended floors, tiled roofs and later heating upgrades.

1919–1964
Common assembly context

What may be original

  • Region-specific envelope and service systems
  • Later retrofit layers should be recorded separately
Priority clues

What deserves attention

  • bridged cavities
  • air-brick blockage
  • roof underlay ageing
  • cold bridges
First checks

Reduce uncertainty first

  1. Confirm original construction era
  2. Record major renovations
  3. Compare symptom timing with weather and system use
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Original era is only the start.

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