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

The year changes the likely assembly.

Choose a regional construction era to see common systems, priority clues and the first context checks.

NORDICS · Before 1940

Traditional Nordic houses

Timber or masonry structures, ventilated foundations and later layered insulation upgrades.

foundation airflowchimney moistureroof leakage
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NORDICS · 1940–1975

Post-war Nordic housing

Rapid construction, vented attics, crawl spaces or early slabs and mechanical exhaust.

crawl humidityattic condensationdrainage ageing
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NORDICS · 1976–1999

Energy-crisis construction

Heavier insulation, tighter envelopes and evolving vapour and ventilation practice.

air leakage concentrationventilation imbalancethermal bridges
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NORDICS · 2000–present

Low-energy Nordic homes

Highly insulated, airtight assemblies with mechanical ventilation and complex service penetrations.

commissioningfilter and airflow issueslocalized leakage
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