Plastic Capped Washer 60mm - 200 per box

The KC Insulation Washer is a precision-engineered fixing component tailored for the secure and thermally efficient installation of insulation layers in External Thermal Insulation Composite Systems (ETICS). Developed by Rawlplug, a leader in fixing technologies, this washer is particularly suitable for use with wooden and sheet metal substrates.

At the core of its design is an integral cap that helps reduce thermal bridging—one of the primary concerns in façade insulation systems. This feature supports improved thermal performance across the building envelope, making the KC washer not just a mechanical fixing but a contributor to system energy efficiency.

Key Features and Benefits

• Thermal Bridge Reduction: The integral cap minimises conductive heat transfer through the fixing, ensuring improved overall insulation performance.

• Versatile Application: Suitable for a wide range of insulation materials, including Expanded Polystyrene (EPS), Mineral Wool, and Polyurethane (PU) boards.

• Substrate Compatibility: Can be used with UC chipboard screws for wooden substrates and WB or WX self-drilling screws for sheet metal, providing flexibility across construction types.

• Quick and Clean Installation: The KC washer is designed for straightforward application—insert into insulation, drive the screw through, and achieve a secure, flush finish.

• Optional Reinforcement: Can be used in combination with KWL plates (90 mm, 110 mm, or 140 mm diameters) to increase load distribution over the insulation surface.

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Typical Applications

The KC Insulation Washer is designed for use in ETICS projects, where secure and thermally efficient fixing of insulation layers is essential. It is especially useful in retrofit insulation upgrades and new-build projects where timber or sheet metal forms the substrate.

It supports the installation of:

• Polystyrene (EPS) boards

• Mineral wool

• Polyurethane (PU) boards

Technical Performance

Rawlplug has tested and documented the mechanical performance of the KC washer across various substrate types. Notably, it provides:

• Recommended tensile loads of up to 0.31 kN in steel and 0.22 kN in timber (with ø6 UC screw).

• A consistent plate stiffness of 0.4 kN/mm, offering reliable retention across a range of insulation systems.

Installation Considerations

Installation is straightforward:

1. Insert the KC washer lightly into the insulation surface.

2. Drive the screw through the washer and insulation into the substrate until the required fixing depth is achieved.

3. Use the recommended screw type depending on substrate material—UC screws for wood and WB/WX screws for metal.

The washer does not require a pre-drilled hole in either timber or steel, and minimum edge and spacing requirements are standardised at 100 mm, helping simplify planning and execution on site.

Technical Data