Headlap
The measurement of the overlap of one course of slates or tiles over the course below (used to work out the batten gauge). Usually expressed as a maximum or minimum measurement in millimetres, defined by the tile or slate manufacturer.
The measurement of the overlap of one course of slates or tiles over the course below (used to work out the batten gauge). Usually expressed as a maximum or minimum measurement in millimetres, defined by the tile or slate manufacturer.