Description

Kingspan Kooltherm K3 Floorboard 25mm – Slimline Floor Insulation for Energy-Efficient Projects

The Kingspan Kooltherm K3 Floorboard (25mm) is a premium, rigid insulation board designed for suspended timber and solid concrete floors. It features a fibre-free phenolic core that delivers excellent thermal performance in a compact 25mm profile.

With a thermal conductivity as low as 0.020 W/m·K, this board offers impressive insulation despite its slim thickness. Therefore, it’s ideal for renovation projects or space-restricted areas where floor build-up must be kept to a minimum.

Perfect for Timber and Concrete Floor Applications

Whether you’re working with timber floor joists or concrete slabs, the K3 25mm board provides a reliable insulation layer that helps reduce heat loss from below. Additionally, its low profile allows you to maintain floor height without compromising energy performance.

This makes it a practical solution for both residential upgrades and light commercial fit-outs.

Quick to Install, Durable Over Time

Thanks to its rigid and lightweight design, the Kooltherm K3 25mm board is easy to cut and fit on-site. It can be installed between joists, over screeds, or beneath floor finishes — offering flexibility for a variety of build types.

Moreover, the closed-cell phenolic core resists moisture and maintains its shape over time. As a result, it continues to perform long after installation, even in humid or ground-adjacent areas.

Integrates with the Kooltherm System

The K3 25mm board works perfectly alongside other Kingspan Kooltherm products, such as K12 for walls and K10 G2 for soffits. Together, they create a fully insulated building envelope that supports compliance with NCC/BCA thermal requirements.

Furthermore, using a unified system makes it easier to specify and ensures consistent thermal performance across your project.

Why Choose Kingspan Kooltherm K3 Floorboard – 25mm?

✅ Slim 25mm profile – ideal for low floor build-up
✅ Excellent thermal performance with minimal thickness
✅ Lightweight and easy to install
✅ Moisture-resistant phenolic core
✅ Suitable for both timber joists and concrete floors
✅ Part of the full Kingspan Kooltherm system

When space is limited but performance matters, the Kingspan K3 25mm Floorboard is a smart and efficient choice.

More details with overview, technical information & product downloads also available.

Order Kingspan Kooltherm K3 25mm – Pickup or Delivery

📞 Call us on 03 8339 7111 to check availability or lead times
📍 Pickup location: 56 Yellowbox Drive, Craigieburn VIC
🕒 Business hours: Mon–Thurs 6:30am–4:00pm | Fri 6:30am–3:00pm
🚚 Delivery also available across Melbourne and surrounding areas