BULDX / Structural Movement

Planning Expansion Joints at Door Thresholds

BULDX product guides2 min read

An expansion joint near a doorway needs a combined review of the moving profile and the opening door. Door clearance should be checked against the selected joint assembly and its expected position, not only the surrounding floor finish.

AI-generated product sample context: Double doorway at a convention venue, frontal symmetrical composition
APPLICATION ILLUSTRATIONAI-generated application illustration. A new visual concept, not a completed BULDX project or an approved installation drawing.

Selection considerations

Overlay the door plan with the structural joint layout. Identify the leaf sweep, threshold, seals, closer arrangement and the route through the opening. A cover that clears a stationary leaf may interact differently with a sweeping seal or a changing joint position.

Review the whole opening with the door and joint suppliers. Keep accessibility, weather sealing and fire-door requirements attached to their respective approved designs. A joint profile's floor application does not prove that a modified threshold meets every requirement of the door assembly.

Build a local mockup where the interface is complicated. Observe the door through its full travel and record the accepted configuration. Keep the agreed levels and component codes on the coordinated drawing so a later floor or hardware substitution triggers a fresh review.

Before you specify or order

  • Overlay the door sweep and joint line
  • Review seals and thresholds
  • Check the full travel on a mockup
  • Record agreed component codes

Relevant BULDX catalogue examples

These records illustrate the product types discussed. Compare the full specifications before selecting; listing here does not establish project suitability or make the items interchangeable.

BULDX catalogue illustration: 100 mm Top-Floor Expansion Joint - Type 3, code BDX-EJ-TF-3-100
CATALOGUE REFERENCEBDX-EJ-TF-3-100 · Catalogue geometry reference; a family illustration may be shared by variants. Consult the exact selected drawing for variant dimensions and assembly requirements.
Product and codeSelected catalogue fields
BDX-EJ-TF-3-100100 mm Top-Floor Expansion Joint - Type 3Top-Floor Joints
Nominal joint width
100 mm
Movement capability
±14 mm
Profile height
27 mm
Standard length
3 m
Material
Aluminium / EPDM
BDX-EJ-TF-1-100100 mm Top-Floor Expansion Joint - Type 1Top-Floor Joints
Nominal joint width
100 mm
Movement capability
±14 mm
Profile height
17 mm
Standard length
3 m
Material
Aluminium / EPDM
BDX-EJ-TF-2-100100 mm Top-Floor Expansion Joint - Type 2Top-Floor Joints
Nominal joint width
100 mm
Movement capability
±14 mm
Profile height
27 mm
Standard length
3 m
Material
Aluminium / EPDM
Browse the complete Structural Movement catalogue

Common question

Is a clear closed-door gap enough?

No. Review the leaf movement, seals and joint interface throughout operation using the approved door and joint details.

References and scope

Product fields are from the BULDX catalogue. Confirm the current selected drawing, supporting performance documents and approved project detail before ordering. External references, where listed, provide background guidance and do not certify these products.