Research and analysis

Resistance to moisture in buildings

This research investigated the moisture resistance of typical constructions in both new buildings and where insulation is retrofitted to existing buildings. 

• From: Ministry of Housing, Communities & Local Government (2018 to 2021)
• Published: 16 July 2019

Documents

Research into resistance to moisture in buildings: research summary

PDF, 1.65 MB, 52 pages

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Identification of common types of construction

PDF, 394 KB, 20 pages

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Using calculation methods to assess surface and interstitial condensation

PDF, 1.3 MB, 62 pages

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Using numerical simulation to assess moisture risk in new constructions

PDF, 14.8 MB, 363 pages

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Using numerical simulation to assess moisture risk in retrofit constructions - Part 1

PDF, 18.9 MB, 317 pages

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Using numerical simulation to assess moisture risk in retrofit constructions - Part 2

PDF, 5.41 MB, 147 pages

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Assessment of current moisture guidance

PDF, 4.35 MB, 166 pages

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Simplified rules

PDF, 293 KB, 31 pages

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Details

It is a requirement of Part C of the Building Regulations that buildings, and people who use these buildings, are adequately protected from harmful effects of moisture.

The Ministry of Housing, Communities and Local Government commissioned PRP to carry out this research study. There were two key aspects to the project: 

• to verify the robustness of the guidance presented in Approved Document C for new buildings in the light of changes to Part L and to identify gaps in the current guidance

• to develop a set of relevant guidance for situations where insulation is retrofitted to existing buildings

Published 16 July 2019