Building Construction
The term string is used for

Outer projecting edge of a tread
A sloping member which supports the steps in a stair
A vertical member between two treads
The underside of a stair

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Building Construction
In English garden wall bond

The middle course of stretchers is started with a header to give proper vertical joints
Queen closer in provided in each heading course
One course of headers to three or five course of stretchers
All of these

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