Building Construction Handbook, Eighth Edition

Sills ~ the primary function of any sill is to collect the rainwater

which has run down the face of the window or door and shed it

clear of the wall below.

Timber Sill 1, Cast Stone Subsill and Slate Sill have applications

limited † see pages 488 and 489.

Typical Sill details ~

Ref. BS 5642-1: Sills and copings. Specification for window sills of

precast concrete, cast stone, clayware, slate and natural stone.

Opening Details---Sills