Kingspan Kooltherm K107 Pitched Roof Insulation Board

Kingspan Kooltherm K107 is a high-performance insulation board specifically designed for pitched roof applications. Whether you're working on a new build, a loft conversion, or simply upgrading your existing roof insulation, K107 offers excellent thermal performance with minimal thickness. It's suitable for a wide range of pitched roof elements including slated or tiled roofs, attic floors, dwarf walls, flat ceilings, and dormer windows. Thanks to its lightweight structure and foil-faced design, K107 is easy to handle, cut, and install — perfect for projects where time and efficiency are essential. It's also ideal for retrofit loft conversions where the roof structure remains in place, saving both labour and cost.

Why Choose Kooltherm K107?

Provides excellent insulation performance with a low thermal conductivity of just 0.019 W/mK Allows you to achieve low U-values with a thinner board compared to standard insulants Highly resistant to sagging, ensuring long-term performance Ideal for turning your attic or loft into a comfortable, usable space Low emissivity foil facing helps reduce heat loss and improve energy efficiency Can potentially reduce the need for additional insulated plasterboard Easy to transport and install, making it suitable for both professional installers and experienced DIYers Backed by expert technical guidance from Kingspan BIM objects available for accurate specification in digital design

Available Thicknesses & Pack Coverage

25mm – approx. 34.56m² per Pack 40mm – approx. 23.04m² per Pack 50mm – approx. 17.28m² per Pack 60mm – approx. 14.40m² per Pack 70mm – approx. 11.52m² per Pack 75mm – approx. 11.52m² per Pack 90mm – approx. 8.64m² per Pack 100mm – approx. 8.64m² per Pack 150mm – approx. 5.73m² per Pack Each board measures 1200mm x 2400mm and is easy to trim to fit various rafter spacings or awkward angles.

Frequently Asked Questions

1. Can I use Kooltherm K107 for a loft conversion without re-roofing?

Yes, K107 is ideal for retrofitting in loft conversions where you’re not replacing the roof. It can be installed between rafters to provide excellent insulation without major structural changes.

2. Does Kooltherm K107 require an additional layer of insulated plasterboard?

In many cases, no. Thanks to its high thermal efficiency, K107 can often meet U-value targets on its own, potentially eliminating the need for insulated plasterboard. Always check with your building regs or architect for your specific project.

3. What tools are needed to install Kooltherm K107?

The boards are easy to cut using a fine-toothed saw or insulation knife. You’ll also need fixings suitable for your roof type and basic tools like a tape measure, utility knife, and safety gear.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
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Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.