Kingspan Insulation Board

Kingspan is the global leader in high-performance insulation and for good reason. Designed with the construction industry in mind, Kingspan water-resistant insulation boards are excellent barriers against heat loss, offering optimum thermal performance in building applications, such as roofs, walls and floors. 

Kingspan offers a range of products suited to individual applications such as Thermaroof, Thermafloor, and phenolic Kooltherm boards, all of which are tailor-made to improve the thermal envelope of your home.

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What Are Kingspan Insulation Boards Made Of?

Whilst there are a variety of different Kingspan insulation boards available on the market, Kingspan specialises solely in PIR and phenolic boards. The Kingspan Kooltherm range is made from phenolic, whilst the Kingspan Therma range is made from PIR. Both PIR and phenolic are known for being excellent insulators with a thermal conductivity as low as 0.018 W/mK.

We recommend choosing a Kingspan insulation board for cavity wall insulation, floor insulation, and roof insulation - specifically in applications where you are looking to retain heat. What's more, these boards have low global warming potential and zero ozone depletion potential, making them as gentle on the planet as they are tough on thermal performance.

Kingspan also has an insulated plasterboard range too. 

Kingspan Therma PIR Insulation


With a fibre-free rigid thermoset PIR insulation core, and a thermal conductivity of 0.022 - 0.027 W/mK, Kingspan Therma range products are among the more thermally efficient insulation products on the market.

The Kingspan Thermapitch and Thermafloor range are made from a foam called PIR (polyisocyanurate). PIR is one of the most common insulation materials because it combines affordability with a host of thermal benefits. An especially popular board from this range is the 100mm Kingspan Thermapitch TP10 PIR Insulation Board, which is suitable for tiled or slated pitched warm roof spaces. For flat roof insulation, we recommend Thermaroof, which is faced on both sides with a coated glass tissue facing and is fully compatible with most mechanically fixed single-ply waterproofing systems.

As well as being a good barrier against heat, Kingspan PIR panels are thin and rigid. Half a Kingspan PIR board can achieve the same thermal resistance that other insulation materials can at double the thickness. They are lightweight and easy to handle and install. We recommend Thermafloor and Thermapitch Kingspan boards for ground floors and tiled or slated pitched roof spaces. You can choose from thicknesses ranging from 25mm to 150mm

Kingspan Kooltherm Phenolic Insulation


Kingspan Kooltherm K100 boards are premium performance products made from phenolic foam. Kingspan is the exclusive manufacturer of phenolic insulation products in the UK.

Phenolic boards offer higher thermal resistance and lower thermal conductivity than standard PIR insulation boards. Some Kingspan Kooltherm insulation boards have thermal conductivities as low as 0.018 W/mK. We stock Kingspan Kooltherm phenolic boards for pitched roof, framing, and floor applications. This product is also suitable for use on oil rigs, hospitals, industrial buildings and much more due to its excellent fire resistance. 

For cavities, we recommend using Kingspan Kooltherm Cavity Board; a premium performance board with a fibre-free rigid thermoset phenolic core, a low emissivity composite foil on its inner face and a water-tight, vapour-open polypropylene fleece on its outer face. It is specifically designed to limit thermal bridging and uncontrolled air–leakage via junctions in cavity wall constructions with a 10mm residual cavity to the outer leaf (for walls up to 25m). 

When tackling cavities, the Kooltherm range also features a Kingspan Kooltherm Cavity Closer; a PVCU extrusion with a rigid thermoset insulation core, which provides a simple and efficient method of closing cavities around openings in cavity walls. 

Also for external walls, Kingspan has a range called K105. This board is specifically designed for external wall applications (with a glass tissue facing) and will allow you to render plaster over the material.

Frequently Asked Kingspan Insulation Board Questions

Are Kingspan Insulation Boards Fireproof?

Before buying any type of insulation, we recommend you check the Euroclass rating before committing to purchase. Every single insulation board has a Euroclass rating. Euroclass ratings will tell you how flammable the board is. The scale covers a wide range of options, from A1 (non-combustible) all the way to F (combustible).

The Kingspan Kooltherm range is made from phenolic insulation which benefits thermal conductivity. When phenolic insulation is exposed to heat, a process called pyrolysis (thermal decomposition) begins. A black mark appears on the part of the board that is exposed to heat and hot combustible gases become airborne. Despite this, some of the Kingspan Kooltherm boards can achieve a Euroclass rating of B, which is the best performance that a combustible material can achieve.

The Kingspan Therma range is made from PIR insulation. Like boards in the Kooltherm range, some Kingspan Therma boards offer better fire-resistant qualities than others. Kingspan cavity wall insulation, floor insulation, and loft insulation all have different properties. Kingspan notes that all its Therma boards have ‘properties which can limit their contribution to fire development’ and that ‘the products will self-extinguish when the flame source is removed.’

A poor Euroclass rating should not deter you. You should focus on the overall value of the build-up of materials that you use. You can install other materials alongside Kingspan insulation boards to improve the overall fire rating. 

Are Kingspan Insulation Boards Waterproof?

Phenolic Kingspan insulation boards only absorb around 2% of moisture. They are designed for both residential and commercial use. When you choose boards from the Kooltherm range, you can expect excellent thermal protection and water resistance.

Like Kingspan phenolic boards, Kingspan PIR Therma panels have a closed-cell structure and are resistant to moisture. 

Can You Paint Kingspan Insulation Boards?

There are lots of benefits to choosing rigid boards instead of rolls or batts. One of them is that you can apply paint directly to the board.

You can only paint foil-faced insulation if you prepare the board, however. Foil facings are nonporous, which means that they will not hold the paint. If you pre-treat the facing with galvanised metal etching primer, you can expect a better result. Always consult with a professional before painting a rigid insulation board. The painting process might involve dangerous chemicals that are better left to the professionals.

What Are The Benefits of Using Kingspan Insulation?