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Radon in basement

Updated 2026-09-083 Guides1 technical sources

Radon decisions should be measurement-led. Establish the baseline, understand likely entry paths through floor joints and penetrations, choose mitigation that fits the construction, and measure again after the work.

radon basementradon in basementsmeasuring radon in a basementradon depressurisation below a basement floor

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1 technical/authority sourcesUpdated 2026-09-08

Assessment

Radon in basement

Radon decisions should be measurement-led. Establish the baseline, understand likely entry paths through floor joints and penetrations, choose mitigation that fits the construction, and measure again after the work.

1Use drawings, visible edges, previous work photos or a controlled opening to establish the actual build-up before specifying a new surface or floor.2Inspect each penetration individually, including the outside where possible, and document sealant, sleeves and cracks around it.3Record ventilation type, operating hours, extract/supply locations and indoor humidity before changing equipment or airflow rates.4Find service history, clean or inspect accessible components and distinguish a maintenance failure from an undersized or incorrectly designed system.

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GuideRadon in basements→GuideMeasuring radon in a basement→ChecklistChecklist: Measuring radon in a basement→GuideRadon depressurisation below a basement floor→Problem scenarioRadon is high after a basement renovation→

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WHO handbook on indoor radon: a public health perspectiveWorld Health Organization↗

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GuideMeasuring radon in a basement→GuideRadon depressurisation below a basement floor→GuideRadon in basements→ScenarioRadon is high after a basement renovation→ProblemRadon or new basement floor→ChecklistChecklist: Measuring radon in a basement→Technical termRadon membrane→

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Key signals to document

existing and planned floor build-up3 Guides pipe and cable penetrations3 Guides actual air-change path2 Guides future inspection and maintenance2 Guides condition of the substrate1 Guides intended use of the room1 Guides

All Damp basement & water ingress Mould in basement & musty odour Basement ventilation & condensation Basement drainage & exterior waterproofing Basement excavation & lowering the floor Underpinning & foundation strengthening Basement floor, insulation & underfloor heating Radon in basement Basement bathroom, drainage & waterproofing Basement windows, daylight & exterior exits Basement walls, insulation & finishes

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