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Illustrated Hanbook for Historic Commercial Buildings <br />32 <br />The American bond, also known as Common bond, is a traditional <br />bricklaying pattern frequently used in historic masonry walls. It <br />consists of several courses of stretchers (bricks laid lengthwise) <br />interrupted at regular vertical intervals—typically every sixth or <br />seventh course—by a course of headers (bricks laid with the short <br />end facing out). This header course ties the outer layer of bricks to <br />the inner layers, helping to strengthen the wall. <br />American Bond <br />HeadersStretches <br />Interior walls