Analyses experimental results on air permeability, the impact of air movement on U-factors and interstitial condensation, drying of the outside leaf in the case of partial and full cavity fill, and summer condensation. Thermal bridge effects of traditional features are also evaluated. As a conclusion, seven principles for good cavity wall design, deduced from the array of six performance characteristics, are formulated.

KEYWORDS: year 1995, designing, walls, masonry, bricks, cavity walls, experiment, air permeability, air movement, transmittance, condensation, drying, thermal-insulation, cavity wall insulation, summer, thermal bridges, calculating, performance, comparing, density, air flow rate, water permeability, measuring.