6 Superstructure (excluding roofs)

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6.7 Doors, windows, and glazing

This chapter gives guidance on meeting the Technical Requirements for doors, windows, and glazing, including where coupled door and window frame assemblies are contained within a single storey. Coupled door and window frame assemblies (including spandrel panels) which are:

  • one storey or more in height, or
  • not contained between a structural floor and ceiling.

should be designed in accordance with Chapter 6.9 ‘Curtain walling and cladding’.

This chapter does not provide guidance on compliance with Building Regulations. Work shall comply with all relevant Building Regulations covering:

  • weathertightness
  • thermal performance
  • fire safety
  • safety from impact
  • ventilation 
  • security.

For the purposes of this chapter the following terms and definitions apply:#

Air and vapour control layer Continuous layer of material with a high resistance to water vapour to control the movement of air and water vapour
Air barrier An air barrier controls air leakage into and out of the building envelope. For framed walls, this is usually in the form of a membrane
Breather membrane Continuous layer of material with a low resistance to water vapour to allow vapour movement but impermeable to water
Building envelope External wall or roof construction that separates the habitable parts of a building from the external environment
Coupled door and window frame assemblies A glazed wall formed by combining pre-assembled doors and (or) windows. The window frames may be supported directly by brackets fixed to the primary structure or may be supported by horizontal and vertical framing members
Doors A complete door assembly, assembled on site or delivered as a complete assembly, consisting of the door frame, door leaf or leaves, essential hardware and any integral side panel or fanlight
Fixings Component that is used to secure separate parts of a window or door to each other, to secure an item of hardware to a window or door part, or to secure a completed window or door into the structure of a building
Frames Outer frame, mullion, and transom components of doors and windows
Glazing Glass component of a door or window
Glazing material A material which provides a bedding for the glass and forms a joint between the glass and frame. The term includes glazing compounds, sealants, putties, glazing strips and tapes, and gaskets
Impregnated foam tapes Impregnated foam weatherproofing strip flexible, elastic, preformed material that constitutes a linear seal when compressed
Insulating glass unit IGU Assembly consisting of at least two panes of glass, separated by one or more spacers, hermetically sealed along the periphery, mechanically stable and durable
Sealant Wet applied compound applied in an unformed state to a joint which seals it by adhering to appropriate surfaces within the joint
Structural opening Opening in an external wall or roof into which a window or door is to be installed
System manufacturer Company who designs, manufactures, and supplies a system
Thermal bridging Occurs when part of a thermal element has significantly higher heat transfer than the materials surrounding it
Weathertightness Performance in respect of air permeability, watertightness, and resistance to windload
Window Building component or multiple components for closing an opening in a wall or roof that may admit light and/or provide ventilation

Clauses for 6.7 Doors, windows, and glazing

Last updated: 2nd January 2024

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