BULDX / Structural Movement

Coordinating Joint Profiles with Layered Floor Finishes

BULDX product guides6 October 20262 min read

Coordinate a floor joint against the complete finished floor build-up. Screed, adhesive, underlay and the final surface can change the required profile level even when the structural slab remains unchanged.

AI-generated product sample context: Material samples beside a joint in a library reading room, low side view — APPLICATION ILLUSTRATIONAI-generated application illustration. A new visual concept, not a completed BULDX project or an approved installation drawing.

Selection considerations

Prepare a section through both sides of the joint. List each layer and identify the final walking surface. Where stone meets carpet or resin meets tile, the adjacent assemblies may have different thicknesses and edge-support requirements. Check the selected profile against each side independently.

Use physical finish samples during the review. A nominal tile thickness does not include adhesive, and a carpet sample does not define its installed compression or backing. The finish contractor should identify the agreed build-up while the joint supplier confirms how the profile interfaces with it.

Record the agreed datum on the shop drawing and inspect it before the finish conceals the supports. If a layer changes after approval, reopen the coordination review. Packing pieces or improvised grout should not be accepted as a substitute for the approved installation detail.

Before you specify or order

Draw both finished build-ups
Identify the final walking datum
Review physical samples
Recheck changes before closing the detail

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 Under-Floor Expansion Joint - Type 2, code BDX-EJ-UF-2-100 — CATALOGUE REFERENCE`BDX-EJ-UF-2-100` · Catalogue geometry reference; a family illustration may be shared by variants. Consult the exact selected drawing for variant dimensions and assembly requirements.

Product and code	Selected catalogue fields
`BDX-EJ-UF-2-100`100 mm Under-Floor Expansion Joint - Type 2Under-Floor Joints	Nominal joint width 100 mm Movement capability ±18 mm Profile height 15 / 41 mm Standard length 3 m Material Aluminium / EPDM
`BDX-EJ-UF-1-100`100 mm Under-Floor Expansion Joint - Type 1Under-Floor Joints	Nominal joint width 100 mm Movement capability ±14 mm Profile height 17 / 30 / 50 / 65 mm Standard length 3 m Material Aluminium / EPDM
`BDX-EJ-UF-3-100`100 mm Under-Floor Expansion Joint - Type 3Under-Floor Joints	Nominal joint width 100 mm Movement capability ±8 mm Profile height 41 mm Standard length 3 m Material Aluminium / EPDM

Browse the complete Structural Movement catalogue

Common question

Can a slab-level drawing establish the joint's finished level?

Only if it also defines the complete floor build-up and the profile installation arrangement. The slab datum alone is insufficient.

References and scope

BULDX catalogue: Structural Movement

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.