The Complete Guide to Phenolic Duct Board in the UK

Phenolic duct board is a high-performance insulation material used in duct systems to enhance thermal efficiency and reduce energy consumption. Known for its low thermal conductivity, phenolic insulation boards provide exceptional fire performance and are widely used in HVAC applications across the UK. Leading products such as Kingspan Kooltherm K112, K118, and K103 set the standard for rigid thermoset phenolic insulation.

What is Phenolic Duct Board?

Phenolic duct board is made from rigid phenolic foam with a closed-cell structure, providing excellent thermal insulation and fire resistance. It is often pre-insulated and foil faced or glass tissue faced, ensuring durability and moisture resistance. Available in standard sizes such as 2400mm x 1200mm, phenolic duct boards are ideal for ductwork systems and outdoor duct installations.

Benefits of Phenolic Duct Board

• Exceptional Thermal Performance – Phenolic insulation products offer low thermal conductivity, enhancing energy efficiency and reducing heat loss.

• Fire Performance – Kingspan Kooltherm phenolic insulation has a Class 1 fire rating, providing superior fire resistance for ductwork.

• Space Saving – Due to its high thermal efficiency, phenolic duct board can achieve excellent insulation values with thinner insulation compared to other materials.

• Lightweight and Durable – The rigid thermoset phenolic insulation core ensures durability while remaining lightweight for easy handling.

• Moisture and Vapour Resistance – Phenolic boards provide a vapour barrier, preventing moisture ingress and ensuring long-term performance.

• Energy Savings – By improving thermal efficiency, phenolic duct board helps reduce energy costs and lowers carbon emissions.

Applications of Phenolic Duct Board

• HVAC Duct Systems – Used extensively in heating, ventilation, and air conditioning systems.

• Pitched Roofs and Walls – Provides thermal insulation in duct systems for commercial and residential buildings.

• Outdoor Duct Insulation – Pre-insulated phenolic ductwork is ideal for external applications, offering protection from environmental factors.

• Industrial and Commercial Projects – Suitable for large-scale duct systems requiring high-performance insulation.

Popular Phenolic Insulation Products

• Kingspan Kooltherm K112 Framing Board – A versatile solution for framing and partition walls.

• Kingspan Kooltherm K118 Insulated Plasterboard – Provides superior thermal performance for duct and wall applications.

• Kingspan Kooltherm K103 – Used for floor and roof insulation, delivering outstanding energy efficiency.

• Kingspan Kooltherm K107 – Pre-insulated phenolic ductwork that reduces air leakage and enhances energy efficiency.

Why Choose Phenolic Duct Board?

• Industry-Leading Performance – Phenolic insulation boards provide high resistance to fire, moisture, and air leakage.

• Reduced Energy Consumption – High thermal resistance helps minimise energy costs and supports sustainability goals.

• Lightweight and Easy to Install – Phenolic insulation is easy to handle and can be cut to fit various ductwork system designs.

• Long-Lasting – The rigid thermoset fibre-free structure ensures the insulation is built to last without degrading over time.

How to Install Phenolic Duct Board

1. Measure and Cut – Use standard tools to cut the phenolic insulation board to the required dimensions.

2. Secure and Seal – Attach the board to the duct system and seal joints with foil tape to ensure airtight connections.

3. Fit and Finish – Ensure a snug fit around all sections of the duct to avoid gaps and air leakage.

4. Inspect and Maintain – Regularly inspect the insulation for signs of wear and reseal any areas as needed.

Conclusion

Phenolic duct board is a leading solution for thermal and fire insulation in ductwork systems. With products like Kingspan Kooltherm K112 and K118, phenolic insulation boards offer unparalleled energy efficiency, fire safety, and long-term performance.

Order phenolic duct board today and enhance the performance and safety of your duct systems while reducing energy costs.