Sarking n. : Thin boards for sheathing, as above the rafters, and under the shingles or slates, and for similar purposes.

Example:
what is Sarking, as in siding installation?

Taxonomy
sarking, free encyclopedia, boards, layer, resistant roof, shingles, scrim, search, wood panels, slates, timber battens, wind, heat, Australia and New Zealand, interior construction, widely used, 20th centuries, wooden panels.

Defination from the web:
Sarking is the use of wood panels, or "sarking boards", under the shingles of a roof to provide support. It is a common term in Scotland, ... The word sarking is further used as part of the term "scrim and sarking", a method of interior construction widely used in Australia and New ...