If you’re improving the energy efficiency of a property, planning an extension, or starting a new build, choosing the right insulation can make a big difference. Insulation boards are one of the most popular options because they offer strong thermal performance, are easy to handle, and can be used across a wide range of applications.
From walls and floors, to roofs and loft conversions, there are several types of insulation board available, each designed with different strengths in mind. In this blog, we’ll take a closer look at what insulation boards are, the key benefits they offer, and break down the most common options so you can make an informed decision for your project.
What are insulation boards?
Insulation boards are rigid or semi-rigid panels designed to reduce heat loss and improve a building’s thermal efficiency. They’re typically installed in walls, roofs, ceilings, and other structural areas where improved insulation is needed.
Unlike loose-fill or roll insulation, boards provide a firm, consistent layer of insulation that can be cut to size and fitted neatly between joists, rafters, studs, or over flat surfaces.
Insulation boards are commonly made from materials such as:
- Polyurethane (PUR)
- Expanded polystyrene (EPS)
- Extruded polystyrene (XPS)
Each material performs differently in terms of thermal efficiency, moisture resistance, compressive strength, and cost, which is why it’s important to choose the right one for the job.
What are the benefits of insulation boards?
Insulation boards are widely used across domestic and commercial projects because they offer a number of benefits including:
- Excellent thermal performance – many insulation boards provide high levels of thermal resistance even at relatively slim thicknesses, which helps to save space while improving efficiency.
- Versatile applications – boards can be used in roofs, cavity walls, internal walls, floors, lofts, garages, and extensions to name a few.
- Easy to handle and install – most boards are lightweight, easy to cut, and straightforward to fit with standard tools.
- Moisture resistance – some types of insulation board, such as XPS insulation board, are particularly resistant to moisture, making them ideal for floors and below-ground use.
- Long lifespan – when installed correctly, insulation boards can perform effectively for many years with minimal maintenance.
- Improved energy efficiency – by reducing heat loss, insulation boards can help lower heating bills and improve overall comfort throughout the year.
With these benefits, it’s clear to see why insulation boards are a popular choice for a variety of building and renovation projects.
What are the different types of insulation board?
There are several types of insulation board available, each suited to different applications. Below are three of the most common options used in UK construction and renovation projects.
PUR insulation board
PUR insulation board (polyurethane) has been widely used across walls, floors, and roofs for many years because it offers reliable thermal performance, and it’s often found in existing buildings or older insulation systems.
PUR boards can be useful for refurbishment work, particularly where you’re replacing or matching insulation that is already installed in a property. They’re also lightweight and easy to work with, making them suitable for a range of general building applications.
Some common uses for PUR insulation board include:
- Roof insulation
- Floor insulation
- Wall systems
- Refurbishment projects
If your project involves upgrading an older building, it’s worth checking what insulation has already been used before choosing a replacement. Matching materials and thicknesses can help maintain consistent performance throughout the property.
EPS insulation board
EPS insulation board (expanded polystyrene) is a lightweight and cost-effective insulation option used across a range of domestic and commercial projects. It’s made from expanded foam beads, giving it a distinctive lightweight structure that is easy to handle and cut on site.
EPS is often chosen where budget is a key consideration, but it can still provide good thermal performance when installed correctly and is the right thickness.
You’ll generally find EPS insulation board in:
- Solid wall insulation systems
- Floor insulation
- Void filling and cavity areas
- General thermal upgrades
Because EPS is available in different grades and thicknesses, it’s important to choose the right specification for your project. For example, areas that are subject to heavier loads may need a denser grade than a standard wall application.
XPS insulation board
XPS insulation board (extruded polystyrene) is a dense, durable insulation board known for its moisture resistance and compressive strength. Unlike some lighter insulation materials, XPS is designed to perform well in areas where the board may be exposed to damp conditions or greater pressure.
Its closed-cell structure helps limit water absorption, which is useful in areas where moisture control is a key part of the build.
You’ll often find XPS insulation board in:
- Ground floors and concrete slabs
- Inverted flat roofs
- Basements and below-ground areas
- Garages and workshops
If your project involves insulating below ground level, over concrete, or in an area likely to experience moisture, XPS is usually worth considering over standard insulation boards.
5 tips for choosing the right type of insulation board for your project
Choosing the right type of insulation board depends on a few factors such as where it’s being installed, how much space you have available, and the level of thermal performance your project needs. Here are five tips to help you choose the right one for your project:
- Use PUR insulation board for refurbishment projects – PUR insulation board can be a practical choice when upgrading older insulation systems or matching existing materials already used within a property.
- Pick EPS insulation board for a cost effective option – EPS insulation board is often used where budget is a key consideration and is particularly great for walls, floors, void filling, and general thermal upgrades.
- Choose XPS insulation board where moisture resistance matters – XPS insulation board is a strong option for ground floors, basements, garages, and damp-prone areas because it offers good compressive strength and moisture resistance.
- Measure the available depth before ordering – always check the space available within your wall, floor, or roof build-up so the insulation board thickness works with the overall construction.
- Check U-values and building requirements – before buying insulation boards, make sure the product specification supports the required thermal performance for your project and complies with relevant building regulations.
If you’re unsure which board is right for the job, it’s always worth asking for advice from professionals, like JTD Building Supplies, before purchasing so you can choose the most suitable option first time.
Need a quote for insulation boards?
Whether you’re insulating a roof, upgrading a floor, or improving wall performance, choosing the right board can make a major difference to comfort, efficiency, and long-term value.
At JTD Building Supplies, we stock a range of different types of insulation board – from PUR boards to EPS boards. Whatever your project, our team of helpful specialists can help you choose the right option for the job.
Don’t hesitate to get in touch today for a competitive quote and practical advice on the best insulation boards for your build.
Insulation board FAQs
What are insulation boards used for?
Insulation boards are used to reduce heat loss and improve energy efficiency in buildings. They’re commonly installed in roofs, lofts, walls, floors, garages, and extensions to help keep properties warmer in winter and cooler in summer.
What are some of the different types of insulation board available?
Some of the most common types of insulation board include PUR insulation board, EPS insulation board, and XPS insulation board. Each type is designed for different applications depending on thermal performance, moisture resistance, strength, and budget.
How thick should insulation board be?
The required thickness depends on where the board is being installed and the thermal performance needed. Roofs, floors, and walls may all require different thicknesses, so it’s important to check your project specification or building regulations before purchasing.
Can insulation boards be cut to size?
Yes, most insulation boards can be cut to size using suitable tools such as a fine-toothed saw or insulation knife. Accurate cutting helps create a tighter fit and improves overall performance.
