Breathable membranes have been used in buildings for many years now and, more recently, in cold pitched roof constructions without traditional eaves ventilation. The benefit of reduced heat loss and not having to incorporate ventilators has seen their use grow but at the same time has attracted noticeable comment both from supporters of the application and from detractors who favour traditional ventilation solutions.In light of this, the BBA has prepared this short article to clarify our view as independent assessors of ‘fitness for purpose’ of products and their application. We have adopted a ‘Question and Answer’ approach to allow the easy identification of items of particular interest and/or concern to readers. The views expressed here are based only on the BBA’s experience in assessing breathable membranes in a number of applications over recent years. Products or applications which are outside the scope of published Agrement Certificates or national Codes of Practice have not been assessed by the BBA and are not addressed in this article.

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