Solar glare from buildings is known to be a potential hazard to motorists. For this reason, Councils now generally require a study of solar reflectivity from large building projects and recommendations for solving potential glare problems.
The method adopted by WINDTECH Consultants to examine solar reflectivity from buildings was developed by David N. H. Hassall. The Hassall technique involves the use of a glare protractor and reflection protractor which determine the amount of glare to be expected from any building surface and the degree of annoyance.

The Hassall technique provides detailed information on the more critical aspects of the study. This in turn makes the study very efficient and also able to provide useful results with recommendations on the limiting reflective properties of facade materials being used as well as the time of occurrence of the critical levels of glare.