Celotex vs Kingspan
When looking to purchase insulation products, there are two big names that will constantly crop up: Celotex and Kingspan. Both are very experienced in their field and offer a range of fantastic thermal and acoustic insulation products, suitable for insulating roofs, walls and floors. There are plenty of questions regarding the difference between the two, which we are here to answer.
What’s The Difference Between Celotex and Kingspan?
Celotex and Kingspan are the names of manufacturers that offer very similar insulation products. The individual products will of course vary, both in terms of how they can be used and the size of each. It is important to make sure you’re getting the right product for your needs. So, in terms of whether you should use Celotex or Kingspan, the answer will essentially depend on the pricing and the nature of the product, as well as personal preference.
Though Celotex can be used by some people as a generic term for certain types of insulation boards, it is in fact a brand name for the manufacturer of the same name. It should come as no surprise then to learn that Celotex is one of the biggest names in the industry, and has been producing high quality insulation products for over 90 years. Kingspan is a bit younger, but still has name value after 50 years in the industry.
Overall, Celotex and Kingspan are very similar in the products that they provide, with both offering insulation solutions for the domestic and commercial sectors. For more information on Celotex specifically, you can read through our Celotex guide.
What can I use Celotex and Kingspan Insulation Boards For?
Depending on the individual products, you can use Celotex and Kingspan insulation boards for roofs, walls and flooring inside a home or other building. These insulation boards can come in various sizes and thicknesses, with Celotex for example ranging from 12mm to 200mm. Both manufacturers can provide cost effective insulation, but ensure that you are buying the correct board for your needs.
Which Insulation Should I Use?
Different products suit different needs. Please see our tables for more information on the use and sizes of Celotex and Kingspan insulation boards that are available here at Insulation Express.
Celotex
| Product | Use | Size | Thermal Conductivity W/mK | Available Sizes |
| Celotex CW4000 Insulation Board | Cavity Wall - specifically for use in partial-fill cavity wall applications. | 1200mm x 450mm | 0.022 | 50mm 75mm 100mm |
| Celotex XR4000 Insulation Board | Multi-purpose - Pitched Roofs Flat Roofs Solid Masonry Walls Timber Framed & Steel Framed Systems Floors |
1200mm x 2400mm | 0.022 | 120mm 150mm |
| Celotex PL4000 Thermal Insulation Board | The 'underneath' layer of insulation in between and under rafter and joist applications Insulating solid masonry walls Timber frame lining applications including stud wall insulation |
1200mm x 2400mm | 0.022 | 25mm/12.5mm 40mm/12.5mm 50mm/12.5mm |
| Celotex TB4000 Insulation Board | Multi-purpose - Pitched Roofs Flat Roofs Solid Masonry Walls Timber Framed & Steel Framed systems Floors |
1200mm x 2400mm | 0.022 | 25mm 30mm 40mm |
| Celotex GA4000 Insulation Board | Multi-purpose - Pitched Roofs Flat Roofs Solid Masonry Walls Timber Framed & Steel Framed systems Floors |
1200mm x 2400mm | 0.022 | 50mm 60mm 70mm 75mm 80mm 90mm 100mm |
Kingspan
| Product | Use | Size | Thermal Conductivity W/mK | Available Sizes |
| Kingspan Kooltherm K108 Cavity Board | Cavity Wall - specifically for use in partial-fill cavity wall applications. | 1200mm x 450mm | 0.018 | 50mm 60mm 75mm |
| Kingspan Kooltherm K103 Floor Insulation | Floors
Applied below concrete screeds or slabs |
1200mm x 2400mm | 0.018 | 25mm
50mm 70mm 75mm 100mm |
| Kingspan Kooltherm K118 Insulated Plasterboard | Internal Walls
Suitable for mechanically fixed or plaster dab/adhesive bonded dry-lining |
1200mm x 2400mm | 0.018 | 25mm/12.5mm
30mm/12.5mm 60mm/12.5mm |
| Kingspan Kooltherm K15 Rainscreen Board | Behind rainscreen cladding systems | 1200mm x 2400mm | 0.020 | 60mm
70mm 80mm 100mm |
Products For Floor Insulation
Deciding which insulation product you need will depend on what you will need it for. If you are looking for a solid floor insulation product, the following can be used:
Before you begin insulating your floors, make sure to read through our floor insulation guide.
Products For Wall Insulation
There are three different ways to insulate your walls: Cavity, Interior and Exterior. Celotex CW4000 Insulation Boards and Kingspan Kooltherm K108 Cavity Board are both great options when you are looking for cavity wall insulation.
There are a number of products you can use for external wall insulation in order to help you keep heat and energy in your home, as well as reducing draughts and increasing the lifetime of a wall.
Products For Roof Insulation
There are various forms of roof insulation, depending on the type of roof in question. Loft insulation can be a great way of saving a bit of money due to helping increase the energy efficiency of your home.
If your home requires pitched roof insulation, the best products to use are Celotex XR4000, TB4000 and GA4000.
For a home with a flat roof, our guide on flat roof insulation has all of the information you will need to know.
Is Celotex The Best Insulation?
Celotex is often seen as the most popular form of insulation supplier and is highly respected in the industry. It’s not necessarily a case of Celotex being better than Kingspan or any other suppliers, it will depend on what you need it for and the sizing required.
Is There A Cheaper Alternative To Kingspan?
People often ask, which is the cheapest: Kingspan or Celotex? Pricing of all of our products can change over time, and of course it depends on a multitude of factors such as size, thermal conductivity and what they can be used for. To find the cheapest alternative, be sure to compare our Insulation product pages.
Which Insulation Board Is The Best?
All the insulation boards that we offer are fit for purpose and each comply with the relevant regulatory legislation. We don’t believe that one is better than the other, you just need to match up the sizing and purpose required.
Is Celotex Bad for Your Health?
Celotex products are considered to be non-hazardous and have no known toxic effects. However, inhaling dust should be avoided. Celotex products should always be handled and used in accordance with good occupational hygiene and safety practices. 
Alternative Options To Celotex and Kingspan
If the required Celotex or Kingspan products are not available at the time, we may be required to substitute the product and supply you with an alternative. There’s no need to worry though, as we have a number of fantastic brands to pick from, including Recticel and EcoTherm.
