An impervious membrane laid about two brick courses above ground level to prevent damp from rising. 

An impervious membrane laid beneath a floor as a protection against rising damp. 

See 'Back Pointing' - above 

A window formed in a roof slope which projects from the slope. 

A window where the upper and lower sashes are hung on cords or slides and can move up and down. 

Usually used to describe a timber pin holding jointed sections of timber together