Glossary

Perplexed by all this talk of u-values and blower door tests? Our sustainable building glossary will help you get to grips with the key terminology.

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Term Definition
Intelligent vapour check

A type of membrane, often used in timber frame construction and timber roof structures, that becomes more or less permeable to water vapour depending on ambient conditions. Typically in winter it prevents water vapour from getting it but becomes more vapour permeable in summer to allow water vapour to diffuse out and building components to dry

internal insulation

Insulation applied to the inside of a building, sometimes called dry lining