How Do I Insulate A Flat Roof?

Flat roofing systems are an attractive choice for many buildings, offering not only a distinctive look but also cost and space benefits. However, installing these systems requires attention to detail and the right materials to ensure longevity, durability, and maximum energy efficiency. In this post, we're going to guide you through the process of installing a flat roof system, discussing how to use products like Kingspan TR24, TR27, TR26, Recticel Powerdeck F, Powerdeck U, Eurodeck, and Tekwarm Roofdek Thermal Ply Flat Roof Insulation Board.

Preparing the Roof Deck

Before commencing, ensure the roof deck is in good condition and is free from any debris or dampness. Damaged sections should be replaced to provide a solid and level base for the layers to come.

Vapour Control Layer Installation

Begin with the installation of a vapour control layer. This step is crucial to prevent condensation within the insulation, which could compromise its effectiveness and the overall structure. The vapour control layer should be fully adhered to the roof deck, with all joints sealed to prevent vapour penetration.

Insulation Time

Proper insulation is the core of an energy-efficient flat roof system. When it comes to flat roof insulation, not all products are created equal. Here's where the Kingspan, Recticel and Tekwarm products come into play:

Kingspan TR24, TR27, TR26: These insulation boards provide high thermal efficiency. Their unique construction resists moisture and maintains their insulating effectiveness over time, making them ideal for any flat roofing project. Each product number denotes varying levels of thickness and thermal resistance to cater to different needs.

Recticel Powerdeck F, Powerdeck U, Eurodeck: Recticel products offer exceptional thermal performance and durability. Powerdeck F has a mineral-coated glass fleece finish suitable for mechanically fixed single-ply non-bituminous membranes, while Powerdeck U comes with bituminous glass fleece for torch-on felt systems. Eurodeck is a high-density insulation board perfect for use with hot applied roofing systems.

Tekwarm Roofdek Thermal Ply Flat Roof Insulation Board: This product combines a plywood layer and high-performance insulation, ideal for flat roofs where a decking and insulation layer is needed.

Waterproofing Layer Application

After the insulation layer, it's time to install a waterproofing layer. This could be a single-ply membrane, liquid-applied membrane or a built-up roofing system. The waterproofing layer protects the insulation from weather elements and ensures the roof's longevity.

Finishing Touches

The final steps include installing the edge trims and flashings, and any penetration details need to be waterproofed. Regular inspections are recommended to maintain the health and longevity of your flat roofing system.

Why Choose These Products?

Choosing Kingspan, Recticel, or Tekwarm products ensures that your flat roofing system will have excellent thermal performance, enhanced durability, and a high-quality finish. These high-performing insulation products provide an energy-efficient solution, helping to reduce heating costs and CO2 emissions.

For more details about these products, and assistance in choosing the right insulation for your project, you can always talk to one of our product specialists at InsulationUK on Tel: 03003 034 578 or Email: We’re here to guide you through the process and help ensure your flat roof system will serve you well for years to come.