Parapet

The vertical or near-vertical continuation of the roof waterproofing above the general roof level at abutments, parapets, rooflight kerbs and penetrations. UK guidance calls for upstands of sufficient height above the finished roof surface, terminated with a flashing or capping so water cannot get behind the membrane.

A strip of impervious material, traditionally lead but also aluminium, zinc, copper or polymeric products, dressed over joints and junctions such as upstands, abutments and chimneys to shed water over the waterproofing below. Cover flashings are typically let into masonry chases and dressed down over membrane upstands.