bull header bond

bull header bond

A brick header unit which is laid on edge so that the end of the masonry unit is exposed vertically. See also: Bond
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It seemed that the oyster shells in "Keke Cuo" were not selected by size or by following any rules, but it was found after careful analysis that the big shells were laid in stretcher bond (the overlap, which is usually of half the length of the object) whereas the small ones were laid in bull header bond (the overlap, which is usually of half the of width of the object).
The structure of "Oyster Shell House" in Guangzhou also includes several layers from inside to outside, namely 15 mm facing oyster shell mortar, 25 mm leveling mortar mixed with straw, 200-300 mm internal wall infilled with soil and gravel, 30 mm rendering oyster shell mortar and 200-300 mm oyster shells laid in bull header bond with joints unaligned.
Field investigation shows that both "Keke Cuo" and "Oyster Shell House" with oyster shells laid either in stretcher or bull header bond meet the requirements of walls functioning as sunshades.