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Building components · Frame Members

Noggin

Explains the noggin as a small member doing three distinct jobs, and why omitting it has different consequences in each case.

Form:Linear memberRoles:StructureAttachmentSubstrate

Educational reference entry. What this element has to do, and whether any particular arrangement of it is adequate, depends on the whole assembly, the loading, the exposure, local requirements, the manufacturer's instructions and qualified professional design.

Overview

What a noggin is

A noggin is a short piece fixed between two parallel members — studs in a wall, joists in a floor. Depending on where it is, it does one of three things: it stops slender members twisting, it gives an edge of a board something to fix to, or it provides a solid backing for something to be attached later.

The three jobs are unrelated to each other, which is why a wall can have plenty of noggins and still lack one where a heavy fitting needs support.

Boundaries

How it differs from nearby elements

The distinctions that keep this entry from being a restatement of its neighbours.

  • It is not a stud or a joist. Noggins run between those members, not alongside them, and they span only the gap.
  • It is not a trimmer. A trimmer frames an opening and carries interrupted members; a noggin restrains or backs.
  • It is not a collar tie. A collar resists spread in a roof; a noggin restrains members against twisting.

Terminology

Common names and aliases

These names describe the same element. The library keeps one entry per component so that a trade term or a regional name never becomes a second, thinner page.

  • noggings
  • dwang
  • blocking
  • strutting

Dependencies

What it depends on

What has to be right elsewhere for this element to do its job.

  • Which of its three jobs it is doing in a given position, since that determines whether it is structural, practical or both.
  • How it is fixed at each end.
  • Where board edges fall, if it is there to support them.
  • What is going to be fixed to the wall later, if it is there as backing.

Considerations

Topics that genuinely apply here

Subjects worth discussing about this element. These are discussion topics, never measured values, ratings or performance claims.

Buildability

Backing noggins have to be placed before the lining goes on, which means they depend on knowing what will be fixed to the wall later.

Structural transfer

Where noggins restrain joists or studs against twisting, they are performing a structural function rather than a convenience one.

Acoustic

In separating walls, members connecting the two faces can transmit sound, so where noggins are placed is not acoustically neutral.

Materials

Commonly formed from

Material families this element is commonly realised in. This states common practice only — it is not a statement that any of these materials suits this component in a particular building, which depends on the whole assembly and on qualified review.

Materials LibraryStructural softwood →Cut from the same softwood as the members they run between.Materials LibraryPlywood →Sheet material is used as backing where a wider fixing area is needed than a timber member gives.Materials LibraryLight gauge steel framing →Steel sections fill the same position in steel-framed walls.

Assemblies

Building systems this element is met in

The role this component fills inside each assembly. A role describes what the element does there — it is not a statement that this component suits that system in any particular building.

Primary supportAttachmentFramed Partition →Restrains studs, supports board edges and provides backing for later fixings.Primary supportTimber Joisted Upper Floor →Restrains joists against twisting so they act as intended.Primary supportTimber Platform Frame →Provides restraint and fixing lines within the framed panel.AttachmentWall Lining →Gives board edges and later fixings something solid behind the lining.

Where it is met

Application contexts

Building contexts where this element is commonly encountered. Association is not recommendation: appearing here does not mean the component suits every instance of that context, or any particular one.

  • Building Interior
  • Intermediate Floor
  • Internal Partition

Clarifications

Commonly misunderstood

  • That noggins are optional carpentry. Where they restrain members against twisting, they are part of the structure.
  • That fixings can always be added later. Without backing in the right place, heavy items have nothing solid to fix to once the wall is lined.

Conversations

Questions for qualified professionals

Questions worth asking someone with the project in front of them. This page cannot answer them.

  • Which noggins in this wall or floor are structural restraint, and which are backing?
  • What is going to be fixed to this wall, and is there backing where it is needed?
  • Do noggins in a separating wall connect the two faces, and does that matter acoustically?
  • How are the noggins fixed at each end?

Go deeper

Related Build Design Hub guides

Planning guidance behind the decisions this element involves.

Preparation

Related planning checklists

Owner-side preparation before the conversation where this element comes up.

What this entry does not do

  • No spacing, section or fixing is stated here.
  • Where noggins provide structural restraint, their arrangement is a design matter rather than a site choice.

Structural Frame Members

The columns, beams, joists, rafters, plates and bracing that make up a load-carrying frame, identified by the position each occupies.

Browse all frame members entries →