Diaplas Perimeter Profile

Movement joints

Diaplas Perimeter Profile is a movement joint designed for use in tile installations where separation from adjacent fixed structural elements is required. It features a durable aluminum anchoring leg that provides secure mechanical attachment to the substrate, ensuring long-term performance and stability. Integrated into the profile is a 3/8" (10 mm) -wide, replaceable elastomeric rubber inlay that forms the movement zone. This flexible component accommodates thermal expansion, contraction, and minor substrate movement while effectively decoupling the tile covering from rigid construction elements such as walls, columns, or partitions. The replaceable movement zone not only extends the lifespan of the profile but also facilitates maintenance and aesthetic consistency over time.

Diaplas Perimeter Profile is sized to accommodate tiles of either 3/8" (10 mm) or 1/2" (12.5 mm) thickness, and contributes to the integrity of the overall tile assembly by reducing the risk of cracking, delamination and stress-related failures in areas subject to dynamic movement or differential settlement.

  • 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 Elastomeric Insert
    Flexible, wear-resistant, 3/8" (10 mm) -wide 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.
  • Ideal for Perimeter and Transition Areas
    Especially suited for installations around window and door frames, columns, or where tile meets other materials, ensuring proper decoupling and movement control.
  • Aesthetic and Functional Integration
    Blends seamlessly into tile layouts while offering a professional finish and protecting edge integrity in high-visibility or high-traffic areas.


These features make Diaplas Perimeter Profile an ideal solution for perimeter applications, offering reliable movement accommodation, long-term durability, and a clean, maintenance-friendly finish, perfect for both horizontal and vertical applications in residential and commercial tile installations.

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 Perimeter Profile is part of the lines:

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