Description

Kingspan Kooltherm K3 Floorboard – High-Performance Floor Insulation for Energy-Efficient Builds

The Kingspan Kooltherm K3 Floorboard is a premium rigid insulation solution designed for suspended timber and concrete floors. Featuring an advanced fibre-free phenolic core, K3 delivers industry-leading thermal performance — helping reduce heat loss from the ground up.

With ultra-low thermal conductivity as low as 0.020 W/m·K, Kooltherm K3 provides high R-values in a compact form. As a result, it’s an excellent choice for residential and commercial projects focused on achieving maximum energy efficiency.

This grouped product includes popular thicknesses such as 25mm and 50mm, giving you flexible options for meeting thermal targets and floor design requirements.

Ideal for Timber and Concrete Floors

K3 is suitable for use with both suspended timber and solid concrete floors. Whether you’re building new or upgrading an existing structure, it improves thermal efficiency without adding unnecessary bulk.

The 25mm board is perfect for renovations or space-constrained projects, while the 50mm board delivers stronger R-values for high-performance floors. Therefore, you can select the best option based on your floor depth and compliance needs.

Easy Installation with Lasting Benefits

Thanks to its lightweight and rigid structure, Kooltherm K3 is simple to cut, handle, and install. Boards can be laid between or over floor joists, or fixed directly to concrete slabs depending on the application.

Furthermore, the closed-cell phenolic core resists moisture and won’t sag or degrade over time. This ensures long-term thermal performance and a more comfortable indoor environment.

Part of the Kingspan Kooltherm System

K3 Floorboard is part of the trusted Kingspan Kooltherm range. It integrates smoothly with K12 wall boards and K10 G2 soffit boards, enabling you to insulate the entire building envelope with a consistent, high-performance system.

Moreover, using a full Kooltherm solution can help simplify compliance with NCC/BCA thermal requirements.

Why Choose Kingspan Kooltherm K3 Floorboard?

✅ Delivers excellent R-values in thinner profiles
✅ Available in 25mm and 50mm thicknesses
✅ Designed for both timber and concrete floors
✅ Moisture-resistant and dimensionally stable
✅ Easy to cut and install on-site
✅ Compatible with Kooltherm K12 and K10 G2 products

When you need reliable floor insulation that performs, Kingspan Kooltherm K3 delivers.

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

Order Kingspan Kooltherm K3 Floorboard – Pickup or Delivery

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