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Interior assemblies

Internal Partitions, Linings, Ceilings and Wet Areas

Two partitions finished identically can behave nothing alike, because what decides them is out of sight: how the framing is set out and fixed, whether the cavity is empty or filled, how services cross it, and how it is closed at floor, at ceiling and where it meets an existing wall. The same is true of a lining set out in front of a wall, of a suspended ceiling, and of the void a ceiling creates above a room.

Boards, plasters, paints and tiles themselves are described in the materials library, and choosing between them belongs with the planning guides. Where a partition or floor exists to separate one occupancy from another rather than one room from the next, it is discussed under acoustic separation. Internal wet area waterproofing appears here as an assembly, without falls, tanking specifications or any assurance that a build-up will stay dry.

8 system entries · educational assemblies reference · how a system performs always depends on the whole building and qualified professional design

Scope

What this category covers

Where the boundary of this part of the encyclopedia sits, including what it deliberately leaves to qualified professionals.

  • Framed partitions, independent wall linings, and the shaft walls built from one side only
  • Suspended and framed ceilings and the service voids they create and conceal
  • Internal wet area waterproofing read as an assembly with a perimeter and penetrations
  • Not covered: fire ratings, acoustic values, board or fixing schedules, or tanking specification

All entries

Every partitions & linings entry

The complete set for this category. Frequently referenced entries come first — a starting point, not a ranking.

Framed Partition →A non-loadbearing internal wall of light vertical framing faced with boards on one or both sides, enclosing a cavity that carries infill, services and concealed backing.Demountable Ceiling →A suspended ceiling of exposed metal grid hung from the soffit, with modular panels laid into it, leaving the void above reachable anywhere a panel can be lifted.Wet Area Waterproofing →The layered build-up beneath a tiled or sheet-finished wet area: substrate, sealed junctions, a bonded buried layer, a layer forming falls, and the connection to the outlet.Wall Lining →A board or panel facing held off an existing wall by adhesive, battens or a light frame, producing a flat surface and a void whose contents decide how the lining behaves.Shaft Wall →A framed and boarded enclosure to a lift shaft, riser or duct, arranged so that the whole wall can be built, and later penetrated, from the accessible side alone.Glazed Partition →An internal division whose principal facing is glass, carried in head and base channels and sealed to the surrounding construction, where movement allowance governs the design.Framed Board Ceiling →A suspended ceiling whose concealed framework carries boards jointed into one continuous surface, closing the void above and admitting access only where it was designed in.Service Void →A reserved zone above a ceiling, below a floor, behind a lining or within a riser, coordinated as a shared route for distributing building services and for reaching them again.

Elsewhere on Build Design Hub

Planning guidance for this subject

This encyclopedia explains how these assemblies are organised. These sections help with choosing between them and preparing for the conversation.

Interior ceiling materials →The choosing-and-comparing side of ceiling surfaces.Bathroom waterproofing planning →How wet area waterproofing is approached at planning stage.Wet area material questions →Preparation before a wet room surfaces conversation.

Materials Library

What these assemblies are built from

A systems entry explains how an assembly is organised. These materials sections describe the substances themselves — what they are, how they behave and what governs their use.

Wall Finishes & Linings →Reference entries for internal wall and ceiling materials — plasterboard, gypsum, lime and clay plasters, polished plaster, paints, primers, wallpaper, panelling and acoustic linings.Tiles & Stone →Reference entries for tile and stone surfacing — porcelain and ceramic tile, natural stones, engineered quartz and sintered surfaces, mosaics, backer boards, adhesives and grouts.Panels & Boards →Reference entries for faced and processed panels used in joinery — melamine-faced and laminated boards, veneered and foil-wrapped panels, blockboard, bending board and edge banding.Acoustic & Specialty →Reference entries for ceiling systems, acoustic linings and specialty interior surfaces — suspended grids and tiles, perforated and seamless acoustic finishes, baffles, and glass and metal facings.

Building Systems Encyclopedia

Reference entries for building assemblies — how each is organised, what role every component plays, how the parts interact and which junctions matter.

Browse all building systems →