Our specialist stores
Our specialist stores
Wall Insulation Thermal
Search our extensive range to find the high-quality wall insulation you need to minimise rising energy bills while also making your home a much more comfortable place to live all year round.
Effective home insulation can help you save hundreds of pounds on heating bills every year. This means it won’t take long to start profiting from your investment.
But what is the best insulation for walls around your particular home? How do you choose?
Reach out to our friendly and supportive team on 0203 318 7316 for an expert recommendation. Or check out our essential insulation guide here:
Read more about Wall Insulation.
Wall Insulation Range
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100mm Celotex CW4100 Cavity Wall Insulation Board 1200mm x 450mm 3.24m2 Pack of 6 (3.24m2)
100mm Celotex CW4100 Cavity Wall Insulation Board is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing.
£63.73£76.48 Ex VATInc VAT£19.67£23.60 Per M2 Add to cart -
100mm Celotex GA4100 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
100mm Celotex GA4100 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£37.47£44.96 Ex VATInc VAT£13.01£15.61 Per M2 Add to cart -
100mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
100mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£40.34£48.41 Ex VATInc VAT£14.01£16.81 Per M2 Add to cart -
100mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
100mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£37.85£45.42 Ex VATInc VAT£13.14£15.77 Per M2 Add to cart -
100mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 4.32m2 Pack
100mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
£42.91£51.49 Ex VATInc VAT£9.93£11.92 Per m2 Add to cart -
100mm Rockwool RWA45 Acoustic Insulation Slab 1200 x 600mm 2.88m2 Pack
100mm Rockwool RWA45 has been developed for thermal, acoustic and fire performance in a range of construction types. It is suitable for applications on partition walls, ceilings, floors and roofs.
£23.41£28.09 Ex VATInc VAT£8.13£9.76 Per m2 Add to cart -
100mm Superglass 44 Multi Loft Roll Insulation 12.12m2 Roll
Multi-Roll 44 is a lightweight, non-combustible glass mineral wool roll, designed to provide thermal insulation in lofts. This roll is typically used for insulating loft spaces and cold roofs but can also be used in a multitude of different applications.
£27.35£32.82 Ex VATInc VAT£2.26£2.71 Per m2 Add to cart -
100mm Superglass Superwall 32 Cavity Wall Slab 3.28m2 Pack
100mm Superglass Superwall 32 is a British Board of Agrément (BBA) approved, non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£36.34£43.61 Ex VATInc VAT£11.08£13.30 Per m2 Add to cart -
100mm URSA 32 Cavity Wall Insulation Slab 3.07m2 Pack
100mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£30.52£36.62 Ex VATInc VAT£9.94£11.93 Per m2 Add to cart -
100mm URSA 35 Cavity Wall Insulation Slab 3.69m2 Pack
100mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£21.66£25.99 Ex VATInc VAT£5.87£7.04 Per m2 Add to cart -
110mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
110mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£46.24£55.49 Ex VATInc VAT£16.06£19.27 Per M2 Add to cart -
110mm Unilin Thin-R PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pallet of 21 (60.48m2)
110mm Unilin Thin-R PIR insulation is a foil faced, high-performance insulation solution that offers exceptional thermal efficiency and durability. This polyisocyanurate insulation board, formerly known as Xtratherm, is ideal for a range of applications, such as floors, pitched roofs, and walls.
POA Get a quote -
115mm Celotex Thermaclass Cavity Wall 21 Insulation Board 1190mm x 450mm Pack of 5 (2.67m2)
115mm Celotex Thermaclass Cavity Wall 21 is a PIR T&G insulation board designed for full-fill cavity wall applications. Low-emissivity foil facing provides versatility during installation, allowing for a 10mm residual cavity.
£137.98£165.58 Ex VATInc VAT£51.68£62.02 Per M2 Add to cart -
120mm Celotex XR4120 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Celotex XR4120 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£47.21£56.65 Ex VATInc VAT£16.39£19.67 Per M2 Add to cart -
120mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£50.68£60.82 Ex VATInc VAT£17.60£21.12 Per M2 Add to cart -
120mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£46.68£56.02 Ex VATInc VAT£16.21£19.45 Per M2 Add to cart -
125mm URSA 32 Cavity Wall Insulation Slab 2.46m2 Pack
125mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£30.55£36.66 Ex VATInc VAT£12.42£14.90 Per m2 Add to cart -
125mm URSA 35 Cavity Wall Insulation Slab 3.07m2 Pack
125mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£24.33£29.20 Ex VATInc VAT£7.93£9.52 Per m2 Add to cart -
140mm Celotex XR4140 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
140mm Celotex XR4140 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£58.46£70.15 Ex VATInc VAT£20.30£24.36 Per M2 Add to cart -
140mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
140mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£54.09£64.91 Ex VATInc VAT£18.78£22.54 Per M2 Add to cart -
140mm Rockwool Flexi Slab Acoustic Insulation 1200mm x 600mm 2.88m2 Pack
140mm Rockwool Flexi has been designed as a multi-use, dual-purpose acoustic and thermal mineral wool insulation with a unique flexible edge along one side. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors.
£39.18£47.02 Ex VATInc VAT£13.60£16.32 Per m2 Add to cart -
150mm Celotex XR4150 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
150mm Celotex XR4150 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£56.55£67.86 Ex VATInc VAT£19.64£23.57 Per M2 Add to cart -
150mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
The 150mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£60.22£72.26 Ex VATInc VAT£20.91£25.09 Per M2 Add to cart -
150mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
150mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£54.52£65.42 Ex VATInc VAT£18.93£22.72 Per M2 Add to cart -
150mm Superglass 44 Multi Loft Roll Insulation 7.71m2 Roll
Multi-Roll 44 is a lightweight, non-combustible glass mineral wool roll, designed to provide thermal insulation in lofts. This roll is typically used for insulating loft spaces and cold roofs but can also be used in a multitude of different applications.
£26.35£31.62 Ex VATInc VAT£3.42£4.10 Per m2 Add to cart -
150mm Superglass Superwall 32 Cavity Wall Slab 2.18m2 Pack
150mm Superglass Superwall 32 is non-combustible and water repellent glass mineral wool insulation cavity wall batt. The flexible batt is supplied at 455mm wide to allow easy installation between standard vertical wall tie spacings and minimum on-site cutting and waste.
£35.55£42.66 Ex VATInc VAT£16.31£19.57 Per m2 Add to cart -
150mm URSA 35 Cavity Wall Insulation Slab 2.46m2 Pack
150mm URSA Cavity Batt is a lightweight, semi-rigid glass mineral wool slab treated with silicon-based water repellent. It is suitable for use in both fully and partially filled masonry cavity walls up to 25m high.
£34.00£40.80 Ex VATInc VAT£13.82£16.58 Per m2 Add to cart -
165mm Celotex XR4165 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12
165mm XR4165 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£1,081.61£1,297.93 Ex VATInc VAT£31.30£37.56 Per M2 Add to cart -
200mm Celotex XR4200 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12
200mm XR4200 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£1,478.10£1,773.72 Ex VATInc VAT£42.77£51.32 Per M2 Add to cart -
200mm Superglass 44 Multi Loft Roll Insulation 5.63m2 Roll
Multi-Roll 44 is a lightweight, non-combustible glass mineral wool roll, designed to provide thermal insulation in lofts. This roll is typically used for insulating loft spaces and cold roofs but can also be used in a multitude of different applications.
£28.17£33.80 Ex VATInc VAT£5.00£6.00 Per m2 Add to cart -
25mm Celotex TB4025 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
25mm Celotex TB4025 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£14.27£17.12 Ex VATInc VAT£4.95£5.94 Per M2 Add to cart -
25mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
25mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£14.36£17.23 Ex VATInc VAT£4.99£5.99 Per M2 Add to cart -
30mm Celotex TB4030 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
30mm Celotex TB4030 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£16.67£20.00 Ex VATInc VAT£5.79£6.95 Per M2 Add to cart -
30mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
30mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£17.33£20.80 Ex VATInc VAT£6.02£7.22 Per M2 Add to cart -
40mm Celotex TB4040 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
40mm Celotex TB4040 is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Celotex is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£21.28£25.54 Ex VATInc VAT£7.39£8.87 Per M2 Add to cart -
40mm Ecotherm Eco-Versal PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
40mm Ecotherm Eco-Versal is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Ecotherm Eco-Versal is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£21.21£25.45 Ex VATInc VAT£7.36£8.83 Per M2 Add to cart
What is wall insulation?
Wall insulation is designed to minimise the transfer of heat through the walls of your home. It does this by being a poor heat conductor, slowing the thermal energy as it tries to escape.
The latest insulation materials are often rated by their “lambda value”, a measure of thermal conductivity where a lower number is better.
We stock all of the most effective modern options, including those made from fibreglass, foam, polystyrene, and rock and glass mineral wool. These materials all display the key qualities you need from high-quality wall insulation. They:
- Are light – meaning they don’t allow heat transfer by conduction.
- Trap air molecules – so heat can’t cross the wall by convection.
- Have some mass – to prevent heat spreading by the process of radiation.
Does insulating your home save you money?
Yes. Around 33% of the energy wasted heating our homes passes out through the walls. This makes wall insulation a vital part of ensuring you don’t need to replace all that heat lost to conduction, convection, and radiation.
Poorly insulated homes are less comfortable to live in too. They are colder in winter and hotter in summer, a growing problem when extreme weather conditions like heat waves are on the rise.
Insulating your home’s walls is a smart investment for the future. The wall insulation in our online store is designed by the leading manufacturers in the UK and globally, enabling you to start reducing bill payments and stay comfortable no matter what the outside weather is up to.
How to insulate walls
When you’re working out how to insulate walls, the type of wall you have is the most important thing to determine. If you live in the UK, your home will have one of two types of wall:
Cavity walls – most modern UK homes have cavity walls. These consist of a brick layer and a block layer with an air pocket in between. To insulate them, you drill a hole into the cavity and inject a foam.
Solid walls – UK homes built before the 1920s often have solid walls. Working out how to insulate walls without a cavity is a little different. It can be done internally or externally, with each having a variety of benefits.
Types of wall insulation
Explore our huge online store to discover reliable, proven options for any type of wall insulation you might need:
External Wall Insulation
External wall insulation is affixed to the exterior of your home. It can be covered by rendering, cladding, tiles, panels, or even brick-effect slips. You need to have access to the exterior walls of your home. But the rewards of energy bill reduction, no internal disruption, added acoustic insulation, and repaired brickwork damage – reducing draughts and damp – are well worth it.
Internal Wall Insulation
There are numerous options when it comes to how to insulate walls internally. Installing internal wall insulation most often involves constructing stud walls filled with glass or rock mineral wool fibre or affixing insulation boards directly to the walls themselves. The process can be a little disruptive, but there are huge upsides.
Cavity Wall insulation
Most people trying to work out how to insulate cavity walls are surprised at how simple the process is. Essentially, all you need to do is drill tiny holes in the exterior wall, inject the insulation, and then seal it. There are different cavity insulation materials available in our store to suit every individual need and budget.
How much is wall insulation?
Typically speaking, the larger your property, the greater the cost of insulating a wall. But also, the greater the savings to be made. Factors unique to your home and any other insulation you may already have in place will also play a role.
The average cost of insulating solid walls will typically start from several thousand pounds. However, this could save you hundreds or even as much as a thousand pounds on energy bills every year.
There are also numerous grants and schemes available – such as the LWH (London Warmer Homes) scheme – that can help you save money.
How much is cavity wall insulation?
Cavity wall insulation is much more affordable than solid wall insulation.
The most common rule of thumb is around £200 for each external wall of your property. This means that insulating a detached house might cost around £800, but a terraced house £400. Single-storey homes like bungalows can cost half as much, and taller homes more.
Again though, it’s important to stack how much cavity wall insulation costs against how much it saves. Insulation can reduce your annual heating bills by hundreds of pounds.
What are the best types of wall insulation in our online store?
Check out our range to discover a wide variety of options from the most trusted manufacturers in the UK and beyond, including the highly-regarded:
- Superglass Superwall 32/36
- Superglass Acoustic
- Superglass Multi-Roll
- URSA Acoustic
- URSA Cavity Wall Insulation
- URSA Roll Insulation
- Kingspan Kooltherm K106/K108/K5/K12
- Rockwool Flexi
- Rockwool RWA45, RW3, RW4, RW5, RW6, and XD
The most commonly asked questions about wall insulation
Is cavity wall insulation a good idea?
Properly installed cavity wall insulation will reduce your energy usage and carbon emissions and make your home more comfortable to live in. It is also very cost-effective. However, it is always important to make sure you are choosing the right material for your property and that you know how to install it correctly.
Does cavity wall insulation cause damp?
No. The only occasions when cavity wall insulation can cause damp is when it has been improperly installed or your property’s external masonry was already damaged. In these circumstances, it’s unlikely that any kind of insulation would continue to protect you.
Is wall insulation on its own enough?
No, but it is a very good place to start. If you really want to minimise your energy bills, it is worth looking into how to insulate your floor, roof, and loft space too.
What insulation is best for walls?
If you’re not sure which insulation is best for the walls of your particular home, please do give us a quick call on 0203 318 7316 for sensible, supportive advice.
There is absolutely no commitment to buy from us, just free information on the merits of different solid and cavity wall insulation options.
We’ll help you get the best value for money on a product that itself is going to save you money long into the future.
At Insulation Wholesale, you can purchase Wall Insulation at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.