Insulation
Are you in the market to buy insulation? Look no further than Insulation4less! We've got a great selection of insulating materials for sale, so you can find the perfect product for your needs. Whether you're looking to insulate your attic or garage, or you want to make sure your home is well insulated, we've got you covered. Check out our selection today!
Huge range from all the top brands. Suitable for all applications from floor, roof, loft, wall and more. Lowest prices available online. Need expert advice? Contact us by phone on 020 3582 6399, or Live Chat - Free Delivery on all eligible orders - Hassle Free Return Policy. Read Our Guide to learn more.
Insulation Categories


- 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
- £13.68
- Sale price
- £13.68
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- Regular price
- £11.04
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- £11.04
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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
- £15.96
- Sale price
- £15.96
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- Maximize Energy Efficiency: Thermal conductivity of 0.022 W/mK for reduced heat loss and lower bills.
- Compatibility with Underfloor Heating: Seamless integration for comfort and luxury without compromise.
- Cost Savings & Versatility: Lightweight, easy installation, and suitable for various floor types.
- Regular price
- £128.24
- Sale price
- £128.24
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- Durable, lightweight, air-tight, and water-resistant
- Reduces heat loss, lowers energy bills
- Certified under BBA, CE marking, IAB, and UKAS
- Regular price
- £145.20
- Sale price
- £145.20
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- Regular price
- £91.80
- Sale price
- £91.80
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- Premium lower lambda insulation: Kingspan Kooltherm K103 Floorboard enhances flooring performance with fibre-free phenolic core.
- Durable construction: Glass tissue facings, autohesively bonded, ensure lasting quality and ease of installation.
- Trusted quality: Manufactured underquality standards for safety and reliability.
- Regular price
- £342.00
- Sale price
- £342.00
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- Premium insulation board: Kingspan Thermaroof TR26
- Fibre-free phenolic core, ISO certified
- Size: 2.4 x 1.2m, 0.019 W/mK conductivity
- Regular price
- £294.24
- Sale price
- £294.24
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- High-performance rigid polyisocyanurate insulation.
- Compatible with PVC single-ply waterproofing.
- Resistant to water vapor, solvents, fungi, and rodents.
- Regular price
- £0.00
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- £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
- £1,133.76
- Sale price
- £1,133.76
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- Regular price
- £102.13
- Sale price
- £102.13
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- Premium rigid phenolic core
- Low emissivity foil facing
- Ultra-low thermal conductivity of 0.019 W/mK
- Regular price
- £118.14
- Sale price
- £118.14
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- Expanded polystyrene with graphite enhances thermal insulation in external walls.
- Cost-effective EPS insulation maintains quality and improves U-values, reducing overall project costs.
- Lightweight EPS boards enable lower-cost materials in installation, offering value without compromising performance.
- Regular price
- £63.41
- Sale price
- £63.41
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- Premium insulation board: Kingspan Kooltherm K112 Framing Board
- Exceptional thermal conductivity: 0.019 W/m.K
- Size: 2.4m x 1.2m, ISO-certified, eco-friendly, durable
- Regular price
- £377.94
- Sale price
- £377.94
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- Thermal conductivity: 0.032 W/m·K
- Core thermal resistance: 0.90 to 9.05 m²·K/W
- Thickness options: 30 to 300mm
- Regular price
- £954.00
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- £954.00
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- Regular price
- £140.94
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- £140.94
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- Regular price
- £1,231.25
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- £1,231.25
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- Core R value: 1.9, Thermal Resistance: 3.20 (m².K/W)
- Dimensions: 45mm x 1.6m x 6.25m, covers 10m²
- Water tightness: W1, compatible with various insulation types
- Regular price
- £95.94
- Sale price
- £95.94
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- Superior thermal conductivity of 0.035 W/mK
- Eco-friendly with Zero Ozone Depletion and Global Warming Potential
- Odorless, non-hygroscopic, and rot-proof for lasting protection
- Regular price
- £38.90
- Sale price
- £38.90
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- Regular price
- £302.83
- Sale price
- £302.83
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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
- £1,404.00
- Sale price
- £1,404.00
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- Regular price
- £26.72
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- £26.72
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- Regular price
- £912.00
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- £912.00
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- Premium performance: Kingspan Kooltherm® K110 Soffit Board, fibre-free phenolic core.
- Certified quality: ISO compliance, BBA Certificate 16/5299 for assurance.
- Expert guidance: Kingspan Insulation Technical Service for aesthetics, easy installation.
- Regular price
- £0.00
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- £0.00
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- Regular price
- £9.11
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- £9.11
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- Insulation and plasterboard in one board, suitable for internal wall insulation and pitched roof applications, with multiple fixing methods.
- Consistently sized with tight tolerances to minimise thermal bridging, with a good thermal performance of λ = 0.022 W/mK.
- 3-in-1 solution providing insulation board, vapour control layer and plasterboard, ideal for use on internal walls, pitched roofs, ceilings, and lofts.
- Regular price
- £45.00
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- £45.00
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- Dual-density insulation for resilience and adaptability
- Seamless thermal performance with easy-fit design
- Robust, weather-resistant slab for all climates
- Regular price
- £1,082.40
- Sale price
- £1,082.40
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- £0.00
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- Regular price
- £148.93
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- £148.93
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- Regular price
- £690.00
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- £690.00
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- Regular price
- £91.66
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- £91.66
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- Regular price
- £229.68
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- £229.68
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- The Superfoil SFBA BB is a lightweight, high-quality insulation product with dimensions of 4mm x 1.35m x 50m, offering a coverage area of 67.5m² and a weight of 7.1kg. It's made from 1 Aluminium Metalized PET Layer and 1 layer of Air Bubble.
- It boasts excellent thermal performance with a thermal resistance of 0.125 R Value, high water vapour resistance of 1200MNs/g, and a resistance to water penetration rated at W1, ensuring a comfortable and dry space.
- For safety, it holds a Class E fire rating when installed behind plasterboard, making it a reliable choice for construction or renovation projects.
- Regular price
- £179.42
- Sale price
- £179.42
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- Regular price
- £20.44
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- £20.44
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- Regular price
- £7.26
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- £7.26
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- Regular price
- £84.24
- Sale price
- £84.24
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- Flexible waterproof coating for masonry/concrete
- Long-lasting, UV-resistant, and easy to apply
- Suitable for diverse uses including potable water tanks
- Regular price
- £84.22
- Sale price
- £84.22
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- Regular price
- £6.67
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- £6.67
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- Regular price
- £5.82
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- £5.82
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- Regular price
- £8.46
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- £8.46
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- Regular price
- £9.24
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- £9.24
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- Regular price
- £64.44
- Sale price
- £64.44
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- Rigid polyisocyanurate foam core with multi-layer gastight aluminium complex
- Tested rigorously for water resistance, mechanical strength, and corrosion resistance
- Perfect for roofs, walls, and floors; easy to install; dimensions: 2.4m x 1.2m
- Regular price
- £13.68
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- £13.68
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- Regular price
- £736.02
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- £736.02
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People also searched for...
types of insulation insulation material insulation applications insulation thickness insulation brandsWHAT IS INSULATION?
Insulation is a process to keep sound, electricity and heat from spreading. A material specially designed to prevent the transmission of heat or sound from one space to other is known as insulation material. The ultimate purpose of insulation is to create a barrier around the building which helps in reduction of the amount of heating needed on a cold day or vice versa. All year round you can keep the desired temperature in your house by the help of insulation.
HOW DOES INSULATION WORK?
You will need to understand heat flow if you want to understand how insulation works. Heat is transmitted in three different way like convection, conduction, and radiation. Thermal insulation works by restricting the movement of heat in any form providing a much more comfortable place to live in.
The combination of these two characteristics plays a main role in the quality of insulation
The natural capacity of insulation material to inhibit the transmission of heat.
Natural insulants which are trapped inside the pockets of insulation material.
WHAT ARE THE 3 TYPES OF INSULATION?
The 3 types of insulation are thermal insulation, sound insulation, and fire insulation.
Thermal insulation
Thermal insulation prevents or reduce heat loss and reduces the amount of money and gas and electricity we use to do this. With ever-rising energy costs if the house is properly insulated it can save up to 2/3 of the energy required.
Acoustic insulation
The sound that causes trouble to others is nothing but undesirable an unaccepted sound. Acoustic insulation is also known as sound insulation or soundproof insulation. The purpose of acoustic insulation is to block or decrease the intensity of soundwaves transmitting from outside the house to a room inside or vice versa.
Fire-resistant insulation
Fire-resistant insulation material slows the spread of fire and protects the building. Fire-resistant insulation material is specially designed to resist high temperature and ensure no toxic smoke is released if it does come in contact with flames.
Fire resistance is classified in various ratings as follows
A1- non-combustible
A2- limited combustible
B-F - Low- high contribution to fire.
Another thing you may wish to consider when looking to reduce your heating bills is to use efficient doors and windows. A customer reported big improvements in their heating costs by installing a upvc door in their kitchen. There is no point in insulating your house if you let your heating escape straight into the garden and out onto the decking due to poor ventilation! It is definitely one to add to the list.
Why should you insulate
Reduces heating and energy cost
Control condensation
Lowers carbon footprint
Reduces the amount of noise
Increases fire-resistant of your house
Increases the value of your domestic property
Increases comfort
INSTALLING LOFT INSULATION
Loft insulation is the easiest way to improve comfort and save money in your home.
A well-insulated loft has many benefits including reducing heat loss through the roof. That means you'll have a cosier home which will reduce your heating costs.
Choosing loft insulation
There are different types of loft insulation and they vary in cost and performance. So choose the one which best suits your needs.
The insulation typically comes in rolls or slabs which are pre-cut at common widths. Popular brands include Isover and Knauf.
For more information on choosing loft insulation, see our loft insulation page. We also sell a huge range of roofing products such as roofing membranes and roofing tiles on our sister site Build4less.
Many people choose to install loft insulation themselves, as it works out much cheaper and is an easy job for most people. (Be warned - installing loft insulation is a messy job and you should definitely wear a mask, goggles and gloves!)
The first step is to measure your loft. You can then work out how much material you need (see our guide on measuring). Homeowners typically look to use two layers of a fibreglass type loft roll insulation. The benefits here include cheaper costs and it's easily installed. Other options include using rigid insulation board in the floors (or ceilings in a room in roof situation). The insulation industry is starting to use spray foams and other types of foam insulation such as polyurethane foam in the roof space. This provides better insulation but it's not a DIY job.
You might also consider boarding your loft at the same time, it's a smart way to add extra storage for your tools and household accessories.
Just be careful of electric cables. Electric cables are generally fine to cover with loft roll insulation, but you should consult with an electrician to be sure.
For more detailed information see our diy loft insulation page.
CAVITY WALL INSULATION
Insulating cavity walls is an effective way to lower energy bills by reducing the amount of heat that escapes from your home. It's also one of the most popular retrofit options.
All new builds must insulate their cavity walls to meet building regulations.
New builds typically use pir insulation or another similar insulation board to insulate because you have access while building. This offers the best performance for the cost.
For an existing home, the installation involves using a spray such as beads or spray foam which can be pumped into the walls. This is a technical process and the user needs to be well trained and used to the process in order to get the best results.
For our full range of cavity wall options for new builds, click here.