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What Is a Cold Roof?
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Understand how a cold roof is insulated and ventilated, why condensation can develop and which details help protect the roof structure.
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What is a cold roof? This guide explains how insulation sits between or below the joists or rafters, leaving the roof deck outside the heated envelope. It covers how ventilation and a vapour-control layer manage condensation risk, where cold roofs are used, and why continuous airflow paths and carefully detailed junctions matter.
For the wider moisture requirements, see Approved Document C on GOV.UK, or compare the construction with our guide to warm roofs.
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