Pitched roof ventilation for condensation control
What it looks like
Blocked or insufficient ventilation paths, leading to moisture build-up, dampness, and degradation of timber elements and insulation.
Why it happens
Pitched roofs require adequate ventilation to mitigate the risk of interstitial condensation within the roof structure. For cold roof constructions, continuous ventilation must be provided, typically running from eaves to eaves or at the ridge level, in accordance with regulatory guidance and British Standards.
What it costs if it is missed
Pitched roofs require adequate ventilation to mitigate the risk of interstitial condensation within the roof structure. For cold roof constructions, continuous ventilation must be provided, typically running from eaves to eaves or at the ridge level, in accordance with regulatory guidance and British Standards.
How to inspect for it
Confirm that ventilation openings are clear and correctly sized at eaves, ridge, or other designated points to ensure continuous airflow.
How to prevent it
Pitched roofs require adequate ventilation to mitigate the risk of interstitial condensation within the roof structure. For cold roof constructions, continuous ventilation must be provided, typically running from eaves to eaves or at the ridge level, in accordance with regulatory guidance and British Standards.
Basis in regulation
BS 5250
Read the source
Last updated 23 August 2026. This is our editorial summary of publicly available regulation and site practice, not building control approval or a warranty determination.