A Proctor Group (APG) have stressed the importance of taking account of the HAMM (heat, air, moisture movement) principles when designing buildings, taking account of the effect of insulation type and placement along with the vapour permeability of the various layers.

The previous edition of Construct Ireland featured an article by leading green architect Joseph Little analysing the insulated dry-lined blockwork walls typical of many homes in Irish housing estates, looking particularly at moisture movement within the external walls. Continuing on from that article, Little looks at the implications of several ways of insulating houses of hollow block construction.