There are many forms and profiles used on the above and the permutation of these profiles is the deciding factor that gives you the ultimate end result. Over the years profiles have evolved by the necessity to disperse water away from the building. This is a major consideration when designing bands, pediments and feature stonework. In general bands and profiles are compatible sizes to brickwork and blockwork, therefore giving greater ease in tying back and restraining any forward turning moments. Many historical and period properties have larger overhangs and greater detail, this was achieved by solid walls of a greater thickness allowing a counter balanced stone. Today's modern cavity wall and “U” values pose a whole new problem bearing in mind the need to avoid cold bridging.