Airtightness, Vapour Control and Breathability

ASBP Briefing Paper | August 2019

This paper is part of a series of industry briefing papers aimed at generating a greater understanding of the roles, capabilities and related issues concerning natural fibre insulation (NFI). In doing this, we hope to enable industry to deliver better buildings designed to take advantage of the significant building performance benefits of NFIs.

Airtightness, vapour control and breathability play a critical role in the operational performance of buildings. Understanding how they work together enables us to control air leakage, maximise energy efficiency, optimise indoor air quality and ensures durability of the building fabric.


This paper has been peer reviewed and is supported by members of the ASBP’s Natural Fibre Insulation Group.

Keep up-to-date with the latest resources, case studies and events about natural fibre insulation products and systems at

ASBP is part of the SB&WRC project which is seeking to develop prototype insulation materials from agricultural co-products and waste sources. The project is supported by the INTERREG VA France (Channel) England programme and receives financial support from the European Regional Development Fund (ERDF).

To follow the project more closely, participate in the SB&WRC community on Construction21.

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