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Building components

Terminations & Weathering

The elements where a plane stops, turns up, sheds water or is deliberately interrupted — parapets, upstands, flashings, drips, weeps and movement joints.

6 entries in this category.

Overview

About this category

Most of what goes wrong in a building envelope goes wrong where something ends. A membrane has to stop somewhere; a wall has to stop at the sky; water arriving on a face has to leave it. The elements in this category exist to make endings behave.

These entries name the element and the problem it addresses. They deliberately do not describe details: no upstand height, no lap, no fall, no fixing centres, no cover. A junction concept is not a detail, and this library does not publish approved details.

Boundaries

What this category covers, and what it does not

  • Covers elements that terminate, weather, drain or deliberately interrupt a plane.
  • Does not cover flashing tapes, sealants, copings, cills or trim profiles, which are published material entries.
  • Does not cover cavity trays, rooflight kerbs or abutment arrangements, which are published building systems.
  • States no height, lap, cover, gradient, fixing or joint width, and never presents an arrangement as correct, approved or compliant.

Browse

Forms and roles in this category

Descriptive labels for what is here. They are a way of reading the list, not a filter and not a ranking.

Forms:Profile or trimUnit or moduleVoid or cavity
Roles:DrainageMoisture controlProtectionSeparationTerminationWeather control

Entries

Terminations components

Every entry in this category. Each explains what the element is, what it depends on, and how it relates to materials, systems and junctions.

Profile or trimDrip Edge →A projecting edge or groove that makes water fall clear of a surface instead of running back along its underside.Profile or trimFlashing →A weathering piece that covers a junction from above so water is shed across it rather than entering it.Void or cavityMovement Joint →A deliberate discontinuity that lets parts of a construction move relative to each other without cracking.Unit or moduleParapet →A wall continuing above a roof level, which conceals the roof edge and must be weathered on both faces and on top.Profile or trimUpstand →The turned-up edge of a waterproofing layer where it runs up a vertical surface and terminates above the water level.Void or cavityWeep Opening →A deliberate opening in the outer face of a wall that lets water collected behind it escape.

Related reference libraries

Components are what materials become and what systems are made of. The three libraries answer different questions and are kept deliberately separate.

Materials Library →Building Systems →