PROFESSOR J J. ROBERTS Kingston University

This paper discusses the relative benefits of different forms of masonry external wall construction, including some previously unpublished results from site monitoring. Observations are made on the thermal performance and rain penetration resistance offered by the different constructions and the factors which will affect both solid and cavity wall constructions. The various attempts which have been made over the last fifteen years to expand the use of solid walling in the UK are briefly discussed and some of the factors dictating success or failure identified.