Upstand

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.

A raised frame or upstand constructed on a roof to support and weather items such as rooflights, smoke vents and plant, lifting them above the waterproofing plane. The membrane is dressed up the kerb and the unit itself or a flashing caps the top edge.

A low wall extending above the roof line at the edge of a roof, balcony or bridge. Parapets require careful waterproofing, with membrane upstands, damp proof courses and copings, because they are exposed on both faces and are a common source of water ingress.

A localised element of a roof or below-ground waterproofing system where the continuous field membrane is interrupted or terminated, such as upstands, penetrations, outlets, movement joints and edges. Details demand specific design and careful workmanship, and they are where most waterproofing failures originate.