Internal Wall Insulation

Up to 35% of heat is lost through poorly insulated walls in homes. Upgrading your internal wall insulation is an excellent way to make long-term savings and improve the comfort of your home.
58 products
Celotex PL4050 62.5mm 2.4m x 1.2m
Celotex PL4050 62.5mm 2.4m x 1.2m
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on orders over £300
Vendor
Celotex
Celotex PL4050 62.5mm 2.4m x 1.2m
Regular price
£43.60£52.32
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£43.60 £52.32
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Gyproc ThermaLine Basic Insulation 1.2m x 2.4m (All Sizes)
Gyproc ThermaLine Basic Insulation 1.2m x 2.4m (All Sizes)
Vendor
British Gypsum
Gyproc ThermaLine Basic Insulation 1.2m x 2.4m (All Sizes)
  • Stable R-value: 3x more effective
  • Moisture-resistant, fireproof, eco-friendly
  • Easy to install, reduces heating bills
Regular price
£811.89£974.27
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£811.89 £974.27
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Mannok Insulation Board 1.2m x 2.4m (All Sizes)
Mannok Insulation Board 1.2m x 2.4m (All Sizes)
Vendor
Mannok
Mannok Insulation Board 1.2m x 2.4m (All Sizes)
  • Lightweight PIR insulation board
  • High thermal performance & strength
  • Eco-friendly, water-resistant, easy to cut
Regular price
£11.17£13.40
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£11.17 £13.40
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100% Sheepwool Insulation Optimal Roll (All Sizes)
100% Sheepwool Insulation Optimal Roll (All Sizes)
Vendor
Sheepwool
100% Sheepwool Insulation Optimal Roll (All Sizes)
Regular price
£99.89£119.87
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£99.89 £119.87
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Celotex PL4040 52.5mm 2.4m x 1.2m
Celotex PL4040 52.5mm 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
Celotex PL4040 52.5mm 2.4m x 1.2m
Shop a cheaper alternative product - Warmline PIR Insulated Plasterboard 1.2m x 2.4m
  • PIR insulation with zero ODP, low GWP
  • Combines insulation and plasterboard
  • Speeds up installations, suitable for various applications
Regular price
£38.75£46.50
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£38.75 £46.50
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Celotex PL4060 72.5mm 2.4m x 1.2m
Celotex PL4060 72.5mm 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
Celotex PL4060 72.5mm 2.4m x 1.2m
Shop a cheaper alternative product - Warmline PIR Insulated Plasterboard 1.2m x 2.4m
  • Rigid PIR construction with zero ozone depletion
  • Combines insulation and plasterboard for swift installation
  • Meets regulations, offers long-term energy savings
Regular price
£48.65£58.38
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£48.65 £58.38
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12mm Celotex TB4012 2.4m x 1.2m
12mm Celotex TB4012 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
12mm Celotex TB4012 2.4m x 1.2m
  • High-Performance Insulation: PIR composition, 0.022W/mK thermal conductivity.
  • Environmentally Friendly: Zero ODP, low global warming impact.
  • Versatile & Certified: Eliminates cold spots, meets Building Regulations, and offers energy savings.
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£0.00£0.00
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EcoTherm Eco-Versal Insulation Board 2.4m x 1.2m - All Thicknesses
EcoTherm Eco-Versal Insulation Board 2.4m x 1.2m - All Thicknesses
Free Delivery
on orders over £300
Vendor
Ecotherm
EcoTherm Eco-Versal Insulation Board 2.4m x 1.2m - All Thicknesses
  • All-in-one Eco-versal Insulation Board for thermal conductivity (0.022 W/mK)
  • Rigid PIR core with aluminum composite foil facing, perfect for roofs, walls, and floors
  • Lightweight, easy to cut, and install compared to some other commonly used insulants; offers warmth and durability
Regular price
£11.17£13.40
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£11.17 £13.40
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140mm Celotex XR4140 Insulation Board 2.4m x 1.2m
140mm Celotex XR4140 Insulation Board 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
140mm Celotex XR4140 Insulation Board 2.4m x 1.2m
  • Cut-to-fit for rafters/joists
  • High thermal performance
  • Environmentally friendly
Regular price
£44.95£53.94
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£44.95 £53.94
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Kingspan Thermawall TW55 Steel/Timber Framing Board (All Sizes) 2.4m x 1.2m
Kingspan Thermawall TW55 Steel/Timber Framing Board (All Sizes) 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Kingspan
Kingspan Thermawall TW55 Steel/Timber Framing Board (All Sizes) 2.4m x 1.2m
  • Superior rigid insulation: TW55 boasts low GWP, zero ODP, and a thermal conductivity of 0.022 W/m.K.
  • User-friendly installation: Ideal for steel/timber frames, CFC/HCFC-free, and water vapor resistant.
  • Long-lasting quality: Non-fibrous core, eco-conscious, and available in various sizes at Insulation4less.co.uk.
Regular price
£106.95£128.34
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£106.95 £128.34
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Celotex 20mm TB4020 2.4m x 1.2m
Celotex 20mm TB4020 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
Celotex 20mm TB4020 2.4m x 1.2m
Regular price
£12.72£15.26
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£12.72 £15.26
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Rockwool RW3 Acoustic, Thermal, and Fire Performance Insulation Slabs (All Sizes)
Rockwool RW3 Acoustic, Thermal, and Fire Performance Insulation Slabs (All Sizes)
Free Delivery
on orders over £300
Vendor
Rockwool
Rockwool RW3 Acoustic, Thermal, and Fire Performance Insulation Slabs (All Sizes)
  • Superior thermal, acoustic, and fire insulation from volcanic rock
  • Versatile boards fit snugly into structures, reducing noise and absorbing sound
  • Durable, sustainable, and eco-friendly with various sizes and densities available
Regular price
£414.50£497.40
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£414.50 £497.40
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100% Sheepwool Insulation Premium Roll (All Sizes)
100% Sheepwool Insulation Premium Roll (All Sizes)
Vendor
Sheepwool
100% Sheepwool Insulation Premium Roll (All Sizes)
  • 100% Sheep Wool Insulation Premium Roll
  • Thermal conductivity: 0.0359 W/mK
  • Retains loft, eco-friendly, effective in moisture, and heat control
Regular price
£124.93£149.92
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£124.93 £149.92
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Warmline XPS Insulated Plasterboard 1.2m x 2.4m - All Sizes
Warmline XPS Insulated Plasterboard 1.2m x 2.4m - All Sizes
Free Delivery
on orders over £300
Vendor
Warmline
Warmline XPS Insulated Plasterboard 1.2m x 2.4m - All Sizes
  • Top-notch insulation: Extruded polystyrene foam on robust plasterboard.
  • Effortlessly meets Part L regulations for enhanced warmth.
  • Easy installation, generous dimensions, and exceptional thermal efficiency.
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£0.00£0.00
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Kingspan Kooltherm K118 Insulated Plasterboard (All Sizes) 2.4m x 1.2m (Price Per Pallet)
Kingspan Kooltherm K118 Insulated Plasterboard (All Sizes) 2.4m x 1.2m (Price Per Pallet)
Free Delivery
on orders over £300
Vendor
Kingspan
Kingspan Kooltherm K118 Insulated Plasterboard (All Sizes) 2.4m x 1.2m (Price Per Pallet)
  • Fiber-free, rigid thermoset phenolic core
  • Low lambda values for superior heat retention
  • Dry lining with a strong adhesive bond for protection
Regular price
£944.80£1,133.76
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£944.80 £1,133.76
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130mm Celotex XR4130 2.4m x 1.2m
130mm Celotex XR4130 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
130mm Celotex XR4130 2.4m x 1.2m
  • Premium 130mm Celotex XR4130 insulation
  • Polyisocyanurate (PIR) for eco-friendly high performance
  • Cost-effective, BBA certified, A+ rating, meets Building Regulations
Regular price
£43.95£52.74
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£43.95 £52.74
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Celotex 110mm XR4110 2.4m x 1.2m
Celotex 110mm XR4110 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
Celotex 110mm XR4110 2.4m x 1.2m
  • Cost-effective, high-performance insulation board
  • Thermal conductivity of 0.022W/mK, suitable for various applications
  • Environmentally friendly with zero ozone depletion potential
Regular price
£38.50£46.20
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£38.50 £46.20
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Gyproc Thermaline Plus (2.4m x 1.2m) All Sizes
Gyproc Thermaline Plus (2.4m x 1.2m) All Sizes
Vendor
British Gypsum
Gyproc Thermaline Plus (2.4m x 1.2m) All Sizes
Regular price
£1,223.33£1,468.00
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£1,223.33 £1,468.00
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Celotex 165mm XR4165 2.4m x 1.2m (Pallet of 12)
Celotex 165mm XR4165 2.4m x 1.2m (Pallet of 12)
Free Delivery
on orders over £300
Vendor
Celotex
Celotex 165mm XR4165 2.4m x 1.2m (Pallet of 12)
  • 165mm Celotex XR4000 PIR insulation board
  • Achieves A+ rating, low U-values, and BBA certifications
  • Easy installation, cost-effective, long-lasting thermal performance
Regular price
£778.00£933.60
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£778.00 £933.60
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Rockwool RW5 (All Sizes)
Rockwool RW5 (All Sizes)
Free Delivery
on orders over £300
Vendor
Rockwool
Rockwool RW5 (All Sizes)
  • Enhanced RW5 Insulation Slab: Optimal thermal (0.034 W/mK) and acoustic performance, Euroclass A1 fire reaction, water repellent, various thicknesses (30mm-100mm).
  • Versatile Application: Ideal for walls, ceilings, floors, roofs; tailored for longevity; high-density resin-bonded slabs.
  • Cost-effective Solution: 1200x600mm slab size, 100kg/m³ density, limits fire spread and damage, ensures excellent results.
Regular price
£613.50£736.20
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£613.50 £736.20
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Why do you need Internal Wall insulation?

Internal wall insulation is an essential way of insulating your home to maintain heat and to keep your home warm. Wall insulation is extremely necessary in colder countries as it locks in the heat and blocks out the cold and harsh weather. The installation of Internal wall insulation means you cut costs on energy bills while enjoying a more comfortable living environment. Let’s now talk about the need of Internal Wall insulation and its key benefits in a little more detail.

Acoustic Insulator – Insulation works great when it comes to reducing noise pollution. One of the most important purposes of internal wall insulation is being comfortable in your home, and with well insulated walls one can relax especially at night as external sounds are muted. You do not have to worry about a single pinch of sound once you have installed high quality wall insulation.

Temperature Control – Temperature control is what these wall insulators do best. They will minimize the cold and heat up the environment within your homes. There will be no waste of energy through your walls, and this allows you to make sure that the temperature is well maintained. One can also expect a lower electricity bill every month, and that can be a quick money saver also.

Fire Protection - Internal wall insulation is a great way to protect from fire. In the event of a fire, our non-combustible insulation slows the spread of the flames. In addition, polystyrene boards can help resist fire, and they are very good retardants during an emergency. Big organizations and offices use internal wall insulators with fireproofing as an extra precaution as they are more prone to experiencing short circuits.

Condensation Reduction - The use of Mineral wools, Natural materials, Foam boards and planned ventilation is required results in far less condensation build up. Eliminating Condensation is a significant task that should be performed correctly to get the most out of your insulation.

Things worth knowing when installing wall thermal insulation

There will be cold bridges, floor voids and other reveals that must be taken care of. One must remove everything that is fixed on the walls such as – radiators, pipes, covings, kitchen cabinets, Kitchen cabinets, light switches, curtain rails, fitted wardrobes etc. Chalking out the right methods are necessary before installing insulators. Fix insulation by building a stud wall.The connecting of the joints and skimming of plasterboard is necessary to give it the finishing needed for optimum results.

Preparing the walls for internal insulation

It is important to check the condition of the wall. The condition of the walls will determine the preparation that is needed. You must inspect damp areas and decide whether the old plaster needs to be hacked off. There are many factors to verify –

-Whether the insulators can be fixed with the help of adhesive

-Whether you need mechanical fixing

-Whether battening is required to provide a flat surface



If the wall is damp, then the insulators can worsen the temperature of the wall and this will result in more dampness/damage. If you have a damp wall, then you must make sure that all the damp is taken care of first. By redoing the wall with damp proof materials along with a fresh coat of paint you will be in a better decision to install insulation and receiving positive results.

Dry lining Insulation

This is a process by which internal walls are fixed with insulators with dry lining instead of plastering, and this can be a quick alternative. Dry lining involves masonry of metal and timber and unlike traditional plastering; this needs no water at all. This new type of insulation fixing can increase thermal efficiency. One needs to be cautious in selecting the right plasterboard because these are available in a large range of different sizes and lengths. The process of installation is effortless, and you only need to know the right method to go about it. If you are about to fix dry lining to metal or timber frames, tacking or using screws is the best approach.



The pros of internal wall insulation

-Less expensive than the external wall insulation.

-If you cannot insulate your property externally then this might be the only option for you.

-You can have breathability and ventilation with this IWI.

-They are not very costly, and they are sorted by their Width, thermal conductivity, length, price, thickness, coverage, brand and category meaning you are spoiled for choice.



We here at Insulation4Less hope to have successfully informed you of all the benefits internal wall insulation has to offer! Go ahead and browse our large range of insulation and remember that a member of our support team is always here to help!
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