Internal Wall Insulation


- ✅ Achieves The Same U-Value As Celotex PL4000
- ✅ Thermal Conductivity Of 0.022
- ✅ Built-In Vapour Barrier
- Regular price
- £32.52£39.02
- Sale price
- £32.52 £39.02
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- Versatile Celotex GA4000 insulation boards for floors, walls, and roofs.
- Low emissivity foil face enhances thermal performance.
- Environmentally friendly, durable, lightweight, and easy to install with class 1 fire rating.
- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
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- Regular price
- £17.15£20.58
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- £17.15 £20.58
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- Regular price
- £28.99£34.79
- Sale price
- £28.99 £34.79
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- Regular price
- £21.48£25.78
- Sale price
- £21.48 £25.78
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- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
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- Streamlined installation with Celotex PL4000: combines PIR insulation with plasterboard for one-step efficiency.
- Versatile techniques: choose between 'dot and dab' or mechanically fixed installation for flexibility.
- Energy-efficient solution: tapered edge plasterboard for professional finish, suitable for various projects.
- Regular price
- £33.10£39.72
- Sale price
- £33.10 £39.72
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- Regular price
- £23.65£28.38
- Sale price
- £23.65 £28.38
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- Durable Celotex TB4000 Insulation Board
- Exceptional thermal conductivity (0.022W/mK)
- Cost-effective, strong, easy to install, and long-lasting
- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
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- Eurothane® GP is a high performance, lightweight PIR insulation board, easy to cut, handle, and install for various applications like floors, pitched roofs, internal walls, ceilings, and lofts.
- It is highly favored by contractors and installers for its excellent thermal performance with a λ value of 0.022 W/mK.
- The product ensures a quick and easy installation process, making it an ideal insulation solution.
- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
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- Regular price
- £35.90£43.08
- Sale price
- £35.90 £43.08
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- Environmental-friendly PIR insulation board with foil facings
- High thermal conductivity (0.022W/mK) eliminates cold spots, reduces energy usage, and lowers bills
- Certified with A+ rating, BBA certificates, and meets Building Regulations; easy to install, strong, and long-lasting
- Regular price
- £35.90£43.08
- Sale price
- £35.90 £43.08
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- Regular price
- £16.50£19.80
- Sale price
- £16.50 £19.80
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- Economical, lightweight, and durable PIR insulation board.
- Features low emissivity foil for enhanced thermal conductivity.
- Environmentally safe, fire and water-resistant with long-term performance.
- Regular price
- £24.09£28.91
- Sale price
- £24.09 £28.91
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- Easy to install in various applications.
- Thick PIR board with high thermal performance.
- Manufactured with low emission standards.
- Regular price
- £44.90£53.88
- Sale price
- £44.90 £53.88
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- Regular price
- £22.30£26.76
- Sale price
- £22.30 £26.76
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- Celotex GA4090: 90mm PIR insulation board
- Thermal conductivity: 0.022W/mK
- Eco-friendly, complies with regulations, trusted for 9 decades
- Regular price
- £29.65£35.58
- Sale price
- £29.65 £35.58
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- PIR insulation with zero ODP and low GWP.
- Reduces installation time with combined insulation and plasterboard.
- Suitable for various applications including roofs and walls.
- Regular price
- £33.10£39.72
- Sale price
- £33.10 £39.72
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- Cost-effective Celotex TB4030 PIR insulation board
- Lightweight, easy installation, high tensile strength
- Fire and water-resistant, eco-friendly, long-lasting insulation for walls, roofs, and floors
- Regular price
- £13.30£15.96
- Sale price
- £13.30 £15.96
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- Regular price
- £27.45£32.94
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- £27.45 £32.94
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- Regular price
- £43.85£52.62
- Sale price
- £43.85 £52.62
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- Stable R-value: 3x more effective
- Moisture-resistant, fireproof, eco-friendly
- Easy to install, reduces heating bills
- Regular price
- £811.89£974.27
- Sale price
- £811.89 £974.27
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- Lightweight PIR insulation board
- High thermal performance & strength
- Eco-friendly, water-resistant, easy to cut
- Regular price
- £11.17£13.40
- Sale price
- £11.17 £13.40
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- Regular price
- £99.89£119.87
- Sale price
- £99.89 £119.87
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- PIR insulation with zero ODP, low GWP
- Combines insulation and plasterboard
- Speeds up installations, suitable for various applications
- Regular price
- £42.30£50.76
- Sale price
- £42.30 £50.76
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- Rigid PIR construction with zero ozone depletion
- Combines insulation and plasterboard for swift installation
- Meets regulations, offers long-term energy savings
- Regular price
- £50.80£60.96
- Sale price
- £50.80 £60.96
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- 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.
- Regular price
- £0.00£0.00
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- £0.00 £0.00
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- 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
- Sale price
- £11.17 £13.40
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- Cut-to-fit for rafters/joists
- High thermal performance
- Environmentally friendly
- Regular price
- £44.95£53.94
- Sale price
- £44.95 £53.94
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- 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
- Sale price
- £106.95 £128.34
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- Regular price
- £12.72£15.26
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- £12.72 £15.26
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- 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
- Sale price
- £414.50 £497.40
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- 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
- Sale price
- £124.93 £149.92
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- 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.
- Regular price
- £0.00£0.00
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- £0.00 £0.00
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- 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
- Sale price
- £944.80 £1,133.76
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- 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
- Sale price
- £43.95 £52.74
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- 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
- Sale price
- £38.50 £46.20
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- Regular price
- £1,223.33£1,468.00
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- £1,223.33 £1,468.00
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- 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
- Sale price
- £778.00 £933.60
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- 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
- Sale price
- £613.50 £736.20
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- Thermaclass Cavity Wall 21: High thermal performance PIR insulation (0.021 W/m.K).
- Engineered tongue and groove joint for seamless installation.
- Lightweight, BBA approved with low emissivity foil facing for weather protection.
- Regular price
- £1,170.00£1,404.00
- Sale price
- £1,170.00 £1,404.00
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- Regular price
- £82.80£99.36
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- £82.80 £99.36
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- Exceptional thermal & acoustic performance with non-combustible glass mineral wool
- Hassle-free friction fit installation
- Flexible sizing & multiple applications for comfortable, energy-efficient spaces
- Regular price
- £1,029.02£1,234.82
- Sale price
- £1,029.02 £1,234.82
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- Regular price
- £410.55£492.66
- Sale price
- £410.55 £492.66
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- Unfaced rock mineral wool slabs
- Euroclass A1 fire performance, eco-friendly
- Excellent thermal conductivity: 0.035 W/mK
- Regular price
- £32.40£38.88
- Sale price
- £32.40 £38.88
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- High-performance Celotex XR4200 insulation board
- Low global warming impact, zero ozone depletion
- Superb thermal conductivity, easy installation
- Regular price
- £935.40£1,122.48
- Sale price
- £935.40 £1,122.48
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- Flexible glass mineral wool rolls for timber frames
- Top-notch thermal and sound insulation
- Water-resistant, eco-friendly, and A1 fire rating
- Regular price
- £1,159.89£1,391.87
- Sale price
- £1,159.89 £1,391.87
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- 4-hour fire resistance with 17-minute insulation, ROCKWOOL Cladding Roll excels in thermal and acoustic performance.
- Moisture repellent and environmentally compliant, it's ideal for commercial and industrial projects.
- Tested up to Rw 38 dB, with optional foil facing for added strength, ensuring top-notch safety and efficiency.
- Regular price
- £0.00£0.00
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- £0.00 £0.00
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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 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!