Diaplas Expansion Joint

Movement joints

Diaplas Expansion Joint is a heavy-duty surface joint profile engineered to accommodate movement in tile installations while maintaining surface integrity and providing reliable edge protection. It features robust aluminum anchoring legs that deliver long-lasting structural support and prevent tile edge damage, even under heavy traffic conditions, and is sized to accommodate tiles of either 3/8" (10 mm) or 1/2" (12.5 mm) thickness.

The profile integrates a 7/16" (11 mm) -wide, soft thermoplastic rubber movement zone designed to absorb expansion and contraction stresses while forming a clean, functional surface between tiled sections. This synthetic rubber inlay is fully replaceable, allowing for easy maintenance and extended service life.

Ideal for high-traffic commercial applications, Diaplas Expansion Joint is particularly suited for use in airports, shopping centers, hospitals, transit hubs, industrial facilities or any environment where movement accommodation, durability, and aesthetic consistency are critical.

  • Color-Matched Aesthetic Integration
    Available in three color options designed to coordinate seamlessly with MAPEI’s Mapesil® T Plus silicone sealant, ensuring visual continuity across the tile assembly and minimizing visible transitions.
  • Engineered Movement Accommodation
    Designed to absorb thermal expansion, contraction, and minor structural shifts, helping to reduce internal stresses in large-format tile installations.
  • Durable Aluminum Anchoring Leg
    Provides secure mechanical attachment to the substrate, ensuring long-term stability and resistance to detachment under dynamic loading conditions.
  • Replaceable, 7/16" (11 mm) -wide Elastomeric Insert
    Flexible, wear-resistant movement zone isolates the tile covering from rigid building elements, while allowing for easy replacement to maintain long-term aesthetics and function.
  • Eliminates Need for Caulking
    Provides a clean, maintenance-friendly alternative to sealants, with consistent joint width and superior long-term performance in exposed or high-movement areas.
  • Prevents Cracking and Delamination
    Reduces stress transfer to the tile assembly, minimizing the risk of tile cracking, grout failure, or detachment over time.
  • Aesthetic and Functional Integration
    Blends seamlessly into tile layouts while offering a professional finish and protecting edge integrity in high-visibility or high-traffic zones.


These features make Diaplas Expansion Joint a dependable solution for managing movement within tiled fields, delivering effective stress relief, lasting edge protection, and a clean, low-maintenance finish ideal for horizontal installations in high-traffic commercial environments.

Diaplas profiles and trims are compatible with MAPEI Floor Covering Installation Systems and Tile & Stone Installation Systems products, ensuring a reliable and durable installation. However, it's essential to refer to the specific product’s Technical Data Sheet (TDS), found on www.mapei.com, for comprehensive installation instructions and suitable substrates. By following the manufacturer's guidelines, you can ensure optimal performance and longevity of the installation.

Related documentation

Technical Data Sheet
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Diaplas Expansion Joint is part of the lines:

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