mullion
Let an agent explain what a mullion is and how it differs from transoms and glazing bars, relay its role in historical and modern construction, and help with terminology in architecture, conservation and glazing.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Identify What a mullion is.
Definition
Definition and distinctions.
Definition
Definition.
- What is a mullion, and how does it differ from a transom and a glazing bar? definition
- Is the element a mullion, a transom, a glazing bar or a column? boundary
Kinds
Kinds.
Kinds
Kinds.
- What kinds of mullion exist by material and period? definition
- Which entry fits the specific kind? action
Design Design and construction.
Structure
Structural role.
Structure
Structure.
- How do mullions carry loads in stone tracery and in curtain walls? provenance
- Which entry fits curtain wall? action
Performance
Performance.
Performance
Performance.
- How do mullions affect thermal, acoustic and weather performance? provenance
- Which references are standard? provenance
History History and style.
Gothic
Gothic and Tudor.
Gothic
Gothic.
- How did stone mullions and tracery develop in Gothic and Tudor architecture? provenance
- Which entry fits tracery? action
Modern
Modern facades.
Modern
Modern.
- How do mullions shape modern curtain wall facades? provenance
- Which entry fits modernist architecture? action
Care Conservation.
Conservation
Conservation.
Conservation
Conservation.
- How are historic mullions repaired and conserved? provenance
- Which entry fits window conservation? action
Terms
Terminology.
Terms
Terms.
- How do glazing and architecture trades use the term, and where do usages differ? provenance
- Which sources are cited? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.BLT
What it is Filled
A vertical bar dividing a window, door or screen into sections, structural in medieval stone tracery and in timber and metal frames, and used in modern curtain walls as the vertical member carrying glazing; mullions are distinguished from transoms, which are horizontal, and from glazing bars, which subdivide panes, and they define the appearance of Gothic, Tudor and modern facades.
Why it exists Filled
Let an agent explain what a mullion is and how it differs from transoms and glazing bars, relay its role in historical and modern construction, and help with terminology in architecture, conservation and glazing.
Distinguishing features Filled
- Vertical orientation
- Structural or decorative
- Historical and modern forms
- Defines facade rhythm
What robots and AI may and may not do Filled
Must not
- Approve a curtain wall design without checking mullion wind load by a qualified engineer.
- Remove or cut a mullion that may be structural without engineering advice.
- Alter historic stone mullions in a protected building without consent.
- Confuse mullions with transoms in specifications.
Only with a human decision
- Replacing or altering mullions on a protected or occupied building.
May
- Identify mullions and distinguish them from transoms and glazing bars.
- Describe the role of mullions in a facade or historic window from drawings and surveys.
- Report cracked stone or corroded mullions to the building owner.
Moral aspects Filled
- Failed mullions can drop glass onto people below.
- Original mullions are part of the character of historic buildings.
Who is affected
- Occupants
- Passers-by
- Building owners
Owners Filled
Steward
The owner of the building; building control approves structural changes.
Links to other meta-models Filled
parent
- Q4817 - registry parent class
related
- column - in registry terms, a slender vertical member
- architectural element - of windows and facades
- transom - the horizontal member
- window - or a curtain wall
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.mullion
- Wikidata: Q2031967 (https://www.wikidata.org/wiki/Q2031967)
Direct properties required Filled
- Member height: mm - Measure the vertical extent between the member's end connections.
- Face width: mm - Measure the visible width perpendicular to the member's vertical axis.
- Section depth: mm - Measure the cross-sectional dimension perpendicular to the glazing or screen plane.
- Mass per unit length: kg/m - Determine mass per measured length for the specified material and section.
Recognition required Filled
- Vertical divider in a window or facade
- Stone, timber, metal or modern systems
- Transoms are horizontal; glazing bars subdivide a single pane; a column supports a building
- A vertical bar of stone, wood, metal or plastic between window lights or glazing panels.
Capabilities and actions required Filled
- explain the element and its role
- distinguish from transoms and glazing bars
- relay historical and modern forms
- help with terminology
Hazards and failure modes required Filled
- Thermal bridging in metal mullions
- Structural failure under wind load
- Confusing mullion with transom
Standards and interfaces required Filled
- Building codes for glazing and curtain walls
- Heritage conservation guidance for historic windows
- Thermal performance standards for frames
Context of use required Filled
- Dividing and supporting window and facade openings.
- stone mullions in Gothic and Tudor windows
- timber mullions in casement and sash windows
- metal mullions in curtain walls
- applied and decorative mullions
- mullions in doors and screens
Sources Filled
- Wikidata item Q2031967: mullion - identity and sense of the item
- Wikipedia: Mullion - general description of the item
Open questions
- Should curtain wall mullions be a separate entry?
- How should glazing standards be linked?
- Is the registry parent assignment to column appropriate?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q2031967/spec.json