Insulation Boards 100mm

We stock a wide range of insulation boards 100mm from well-known brands such as Celotex, Kingspan, Mannock and more. We offer insulation at an unbeatable price! Choose from our general-purpose insulation boards to application-specific products. We deliver your 100mm insulation board right to you.

We stock various types of 100mm board such as XPS, EPS, PUR and 100mm PIR BoardsIf you need any help choosing your insulation, don't hesitate to get in touch with our team of experts at insulation4less

Celotex 100mm GA4100 2.4m x 1.2m | 100mm Celotex
100mm Celotex GA4100 2.4m x 1.2m Floor Insulation
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£36.10 £43.32
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£36.10 £43.32
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Celotex CW4100 100mm x 1.2m x 0.45m - 3.24m2
Celotex CW4100 100mm Cavity wall Insulation
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£54.30 £65.16
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£54.30 £65.16
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You're in the market for insulation board and you're wondering what's available in 100mm. There are a lot of different insulation boards out there, but not all of them are created equal. There are many different types of insulation boards available, but 100mm is one of the most popular sizes because it's affordable and easy to install

At we stock all the major brands of insulation board at the best prices in the UK. We stock insulation boards in from all the major manufacturers, with Celotex, Kingspan, Recticel, and Mannock available to buy today.


What type of 100mm insulation board do I need?


There are many different insulation board options available, depending on how you intend to use the board. We stock general purpose insulation boards, reflective insulation boards and acoustic insulation boards in .

General purpose - For use in internal wall and ceiling spaces, this type of board is lightweight and easy to cut. It has a good compressive resistance and it's ideal for filling cavities and studding partitions.

Reflective insulation board - This type of board offers a high level of thermal insulation while being resistant to moisture ingress. The closed cell design works well with narrow cavities, enabling you to achieve an effective thermal performance from a thin installation depth.

Acoustic insulation board - These types of boards offer both sound absorption properties as well as good thermal conductivity. They have a homogenous foil faced structure which makes them suitable for internal

The two most common types of insulation board are mineral wool fibre boards and polyurethane foam boards, both of which are thick.

Mineral wool fibre insulation boards, such as Celotex insulation  are usually priced to be affordable for amateur DIY builders or budget conscious homeowners . These fibre boards are also sometimes referred to as "fibre cement", which can lead to confusion in some cases. The benefit of using a fibreglass board is that it's easy to work with - in fact in many instances you won't even need tools! You can cut the panels down to size simply by scoring them with a sharp blade then snapping the material along the score line.

And when you finished installing your mineral fibre insulation

Here are some of the more popular types and what they're generally used for insulation 


PIR Insulation Boards 


this is a lightweight and versatile material that can be used for loft boarding or between joists. It's cost effective and simple to install – one of the cheapest insulation materials on the market. If you're looking for celotex  to fill an existing gap in your home, this is a good choice.


Phenolic Insulation Boards


This insulation board is made from phenolic resin and comes with a distinctive pink finish. Phenolic boards are more expensive than other materials like PIR and XPS, but it has a better u-value for the same thickness


EPS Board 


this is made up of two parts –the polystyrene core and the facing material. The advantage of having two layers means that the board offers superior soundproofing and thermal insulation properties. It's also very lightweight, making it a great choice for loft boarding or partition walls in houses where you want to minimise the use of building materials.


XPS Back Board


this is a high-density foam board that has a low thermal conductivity and excellent stability. This insulation is ideal for low-temperature applications (when compared to other insulation boards) and can be used in both internal and external environments.


It is a great choice if you need to insulate an existing solid wall. It's fairly easy to install and comes in 300mm wide rolls, which can save you time on the job-site. For new construction, DuPont offers a range of high quality boards available at

PIR rigid polyurethane foam are very commonly used for loft conversions and underfloor heating installations because it's quick and easy to cut this type of board with a knife or circular saw. Kingspan Kooltherm K15 is one example of 100mm PIR boards that have been specifically designed for use


are just a few of the that we stock in 100mm.


Celotex RS100 is Kingspan rigid board, which comes in black or white, and is perfect for insulation use with flooring. Other Celotex are also available in various thicknesses. 


Kingspan Ultra Board EWT is an all purpose EPS product, ideal for use across most building applications, including underfloor heating insulation systems


Kingspan KS100 is our range of lightweight XPS insulation products suitable for cavity wall installation. If you're looking to insulate an exterior wall Cavitywall  come in black or brown , with matching cavity tray available here.


Mannock OSB4+ provides the highest standard of all round, with a high compressive strength and thermal conductivity. OSB4+ is perfect for loft insulation.


Recticel Q-Board  is our range of EPE foam products which are highly versatile, durable and effective heat insulators

You're in the market for insulation 


All of the  we stock at are designed to improve energy efficiency in your home and reduce your energy bills. The type you need will vary depending on things like your budget and the application you have in mind. If you're looking for a certain board, you can filter the results by brand or type to make it easier.


For more information on, take a look at our pir insulation board guide.


What are the main benefits of 100mm?


It is becoming an ever popular option as homeowners and businesses look to reduce their energy bills and protect themselves against rising costs.


They provide excellent thermal performance because they effectively stop heat escaping your property. This helps you keep warm in winter and cool in summer, saving you money year round.


There are many different types of available, all offering different levels of thermal performance and acoustic dampening . Finding the right solution for your needs is easy with this


you just need them for a short term project, such as lining or boarding out an area, then budget options like Kingspan's Kooltherm and Celotex's BT45K are great choices.


For long-term projects such as loft conversions and extensions, consider investing in a higher quality product with a better specification - your energy savings will last longer. The extra cost of a premium insulation board is more than offset by its improved performance. Recticel's Q-Max and Kingspan's Maxitherm Eco are premium insualtion boards that offer outstanding performance at reasonable prices.


If it's soundproofing you're after, then why not consider noise reduction foam boards from Mannock & Kingspan?


Here are some of the most common types of, but if you need help choosing make sure to contact one of our advisors.

How is insulation insulation board thickness measured?


They are measured in millimeters (mm), just like other building materials. This size refers both to the height and width of the panel which has been cut from a sheet that measures 1 meter by 1 meter. Thicker panels tend to be more expensive because they take longer to produce than thinner sheets made from fewer layers. If you're working on a budget it's usually best to choose the thinnest  you can afford so you don't pay for extra material or time. You can always upgrade later if needed!


Celotex are one of the most popular  options, with a full range available to take care of all insulation needs. Celotex is also reinforced with glass fibre for extra strength and durability.


Kingspan comes in an easy-to-use roll format which makes application around your home much easier. The Kingspan range at insulation4less includes both mineral wool and polyisocyanurate rolls, so you're sure to find exactly what you need.

Recticel is another brand that produces high quality at an affordable price point. Recticel are designed especially for use under floors or within cavity walls, making 


The Celotex insulation boards we stock at are all for interior use. The Celotex RS100 is a simply designed, stable board that's available in thicknesses from 25mm to 300mm and can be cut with a knife or saw. It's lightweight and easy to install - ideal for refurbishment projects where you're re-lining the inside of an existing property. Would be great as a DIY project!


The Kingspan range of insulation includes both high density and medium density options so you can choose between strong, energy efficient boards with a reduced thermal conductivity (k value) for your specific application.


They in are suitable for a wide range of applications.


If you're looking to insulate an outside wall, Kingspan pir insulation board is a good choice because it's very durable and resists moisture damage. Celotex are also a great choice if you're insulating a wall, while Recticel has the best vapour barrier properties on the market. If you want some insulation that can be used around heat sources such as boilers or water heaters, or under your floorboards, Mannock is available in at

Kingspan is one of the most popular brands of insulation board in the UK and has become

Celotex Insulation Boards - Kingspan Kooltherm Sheets - Recticel Kingspan is one of the most reputable suppliers of  in the UK, and they offer several different types. Their Kooltherm range includes three energy-efficient options for your home. These include:

Kooltherm rigid polyisocyanurate foam, which offers excellent thermal performance at an affordable price, which offers great sound absorption while still being easy to cut and fit around cornersKooltherm EPS Expanded Polystyrene rigid foam which provides high levels of thermal conductivity with

For a quick and easy fix that will provide an immediate back reduction in your energy bills, you could consider buying bulk insulation rolls. insulation rolls are often available at very affordable prices, but it's worth noting that they can be difficult to handle and install as opposed to boards.

Insulation board is generally used as a soundproofing solution or as an alternative to plasterboard when doing DIY renovations around the home. There are boards specifically designed with both of these applications in mind.

Can't find what you're looking for? Give our friendly customer service team a call today on week and we'll do everything we review can to help you out!

What type of insulation board do I need if I'm decorating


Rigid Polyurethane (PUR) boards are among the most popular insulation boards available. Celotex, Kingspan and Recticel all make PUR foam board insulation. The different manufacturers offer similar products, but they do vary in price and performance. Our insulation experts can help you choose the right product for your needs back. 

  Kingspan Kooltherm Multi-Purpose Board

Kingspan also make a polyisocyanurate (PIR) board called Kooltherm which is suitable for use on solid floors as well as under screeds. Unlike PUR foam boards it's designed to be used with gravel or sand screeds, so if

If you're unsure what type to use per sheet , our type collection select insulation advisors are on hand to help you.

Celotex is perfect if you're looking to increase your insulation but don't want to completely change the appearance of your cookie session shop window or wall. 

delivery select type is great if you need to reduce noise coming from outside. This type of insulation board can also be used to improve insulation boards insulation the sound quality in your home cinema room by absorbing excess sound and dampening it

The collection select type of insulation board that we stock at is suitable for both exterior and interior applications, making it popular with DIY enthusiasts and professionals alike. tiles kitchen tiles If you're looking to insulate your loft or find a quieter route through your home, our collection select insulation boards are ideal.



Customer Service


We pride ourselves on having a dedicated and helpful customer service team, who are ready to help you every step of the way. From advice on choosing pir insulation boards in to managing your order once it's been placed – we're here for you. If you're looking for the best possible prices on celotex , look no further than rated highly customer service.


NLP Celotex


If you're looking for celotex  manufacturers who produce material, our website is the place to be. We stock all the major brands at great prices doors

For example, a Celotex is great for internal walls as they vat provide an airtight seal, so there's no chance of moisture getting underlay into your home.

Kingspan on the other hand are great for exterior walls because they have select type collection high levels of breathability.

Phenolic are often used for loft insulation, because they can be installed in small spaces and provide excellent heat retention.


When you're looking for insulation boards , it's important to consider all of the above. At we stock a range of insulation boards across the UK – from Kingspan to Celotex and Phenolic.

For more information about our 100mm insulation board range or any other materials on our website, please get in touch with us today using one of the contact methods listed above . We'll be happy to help – it's what we do best!

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