Perimeter expansion strip - self-adhesive with foil - thickness. 10; width 160mm - 50/250m IVAR.DP 50

Product detailed description

Perimeter expansion strips are essential components in underfloor heating and cooling systems, particularly in residential and commercial buildings. They are installed along the edges of screed or concrete slabs to manage thermal expansion and contraction caused by temperature fluctuations. Installers working with radiant floor systems must ensure these strips are correctly placed to prevent structural stress and cracking. The strip's self-adhesive backing and perforated surface simplify installation and alignment during screed application.

These strips are commonly used in conjunction with hydronic and electric underfloor heating systems. They are especially important in large or irregularly shaped rooms where expansion forces are more pronounced. The material must remain flexible over time to accommodate repeated thermal cycles, and the foil layer prevents cementitious materials from bonding to the strip, which could restrict movement or cause damage. The 10mm thickness is suitable for standard screed applications, while the 160mm width ensures full coverage along the perimeter.

Technical parameters

Material	polyethylene foam
Code	DP50
Brand	IVAR

The 10mm thickness and 160mm width are critical for ensuring the strip can absorb the expected expansion without buckling or tearing. The 50/250m roll lengths allow for flexibility in project planning and reduce the need for frequent splicing. The polyethylene foam core provides the necessary compressibility and resilience over the service life of the system.Installation and connection The strip is applied directly to the subfloor along the perimeter of the room, leaving a gap between the slab and the wall. The self-adhesive backing ensures secure placement without the need for additional fasteners. The perforated surface allows for easy separation during installation, ensuring the strip lies flat and conforms to the subfloor. It is important to ensure the surface is clean and dry before application to maintain adhesion. Common installation errors include overlapping strips or insufficient gap width, both of which can compromise the system's performance.Compatibility and accessories This perimeter expansion strip is compatible with standard underfloor heating and cooling systems. It is typically used in conjunction with other expansion management components such as internal expansion joints and corner strips. No additional accessories are required for standard installations, but installers should refer to the system's technical documentation for specific recommendations.Technical background for designers The strip operates by allowing controlled movement between the slab and the surrounding structure. The polyethylene foam core is chosen for its compressibility and resistance to degradation from cementitious materials. The foil layer prevents adhesion of the cement paste, ensuring the strip remains free to move. The design must account for the expected thermal expansion of the slab, which is influenced by the system's operating temperature, slab thickness, and room dimensions. Proper integration into the system ensures long-term performance and minimises the risk of structural damage.Service and operation No specific maintenance is required for this product during normal operation. However, periodic visual inspections are recommended to ensure the strip remains intact and has not been damaged during subsequent construction phases. Any damage to the strip should be repaired or replaced to maintain the system's integrity.Frequently asked questions

Can the strip be used in both heating and cooling systems?
Yes, the strip is suitable for both heating and cooling applications as it accommodates thermal expansion in either direction.

Is the strip compatible with all types of screed?
Yes, the strip is designed to work with standard cement-based screeds and is resistant to cement paste adhesion.

How should the strip be cut to fit irregular shapes?
The perforated surface allows for easy manual separation. For complex shapes, a utility knife can be used to cut the strip to size.

Can the strip be installed over existing flooring?
No, the strip must be installed directly on the subfloor before screed application to ensure proper function.

Documents for download

• CSTL_IVAR.DP 50 (PDF)
• CSNAVOD_IVAR.DP 50 (PDF)
• SKTL_IVAR.DP 50 czver (PDF)
• SKNAVOD_IVAR.DP 50 czver (PDF)