Perimeter expansion strip HPW DP 50

Product detailed description

During the installation of heated floors in residential, commercial and industrial buildings, perimeter expansion strips are essential components in screed preparation. These strips manage the differential movement between the structural edges and the heated floor system. Installers should integrate these strips during the insulation board layering phase, prior to screed pouring.

The placement of expansion strips ensures that thermal stresses caused by temperature variations in the screed do not lead to cracks at the edges. This is particularly important in underfloor heating systems where the entire surface area expands and contracts over time. Correct application requires attention to alignment and coverage of the insulation boards to avoid gaps that could compromise structural integrity.

Technical parameters

Installation and connection

Begin by placing the strip along the full perimeter of the room, ensuring it aligns with the edge of the insulation boards. The waterproofing film must be applied to the top surface of the insulation boards before screed pouring. Check that the perforations are oriented correctly for clean separation during future maintenance. Common mistakes include insufficient overlap at corners and failure to apply the film properly, which can result in cement bleed-through.

Compatibility and accessories

This perimeter strip is compatible with IVAR system insulation boards and standard cement-based self-leveling compounds. Always verify that the insulation board system is fully covered by the strip before proceeding with screed installation.

Technical background for designers

Made from closed-cell polyethylene foam, the strip provides compressive strength while remaining flexible enough to accommodate thermal expansion. The waterproofing film acts as a barrier against anhydrous cementitious bleed, which could otherwise degrade the foam’s structural integrity. Proper integration into the system depends on accurate calculation of perimeter lengths and consistent placement around all structural boundaries. The material’s resistance to moisture and deformation ensures long-term performance in various climate conditions.

Service and operation

Once installed, the strip requires no routine maintenance. During periodic inspections, ensure that the waterproofing film remains intact and that there are no signs of cement intrusion. Any visible damage to the strip should be repaired before reapplying a new screed layer to maintain system stability.

Frequently asked questions

Can the DP50I be used with anhydride-based screeds?
Yes, the strip includes a waterproofing film designed specifically to prevent anhydride bleed and chemical interaction with the polyethylene foam.
Is the strip available in custom lengths?
No, the minimum order quantity is 50 meters, with increments also in 50-meter steps.
How is the perforation used in practice?
The strip is cut along the perforation lines to allow for precise removal without damaging the surrounding screed or insulation.
Does the strip require adhesive for installation?
No, the strip is placed directly onto the insulation boards and secured via the screed pouring process.