Condensation risk analysis protects building users from the risk – both to health and financially – of condensation and mould growth in properties.
Since the risk of condensation can increase as buildings become more thermally efficient, it is essential that designs for developments (residential and non-residential) balance energy efficiency, ventilation, and condensation mitigation measures.
Specialist guidance on this risk analysis supports a coordinated approach to design development.
Engaging with warranty providers and building control bodies to understand assessment needs, we undertake risk analysis to exact requirements for each development.
Condensation forms when warm, humid air comes into contact with a cooler surface, or where there is significant temperature difference between elements of the building fabric.
Surface condensation occurs on cold spots of visible surfaces such as walls or around windows (thermal bridges). Interstitial condensation occurs within fabric build ups or sealed construction systems, where inadequate air flow can lead to moisture build up.
Condensation risk analysis assesses where condensation is likely to form within or on the structure, and whether this will create a design issue.
In certain instances, where it can be demonstrated that condensation would dry out during summer months, the potential risk may not be deemed a design issue by the warranty provider or building control body.
Where it is found that condensation within the building elements is expected to build up over time, the design will need to be addressed to reduce the build-up of condensation and avoid costly remediation at a later date.
Surface and interstitial condensation can be mitigated or managed in different ways:
Condensation risk analysis (CRA) should be considered for both residential and non-residential schemes, as advised under Approved Document C (AD-C) of the building regulations in England and Wales, or Section 3 in Scotland. It is typically a requirement from warranty providers too.
Some developers choose to appoint a CRA specialist to identify and mitigate any potential risk during the development of designs.