Suspended Floor Insulation

Improve thermal performance in your floors by fitting insulation between its joists. Read Our Guide for more information
45 products
Celotex GA4000 General Purpose PIR Insulation Board 2.4m x 1.2m (All Sizes)
Celotex GA4000 General Purpose PIR Insulation Board 2.4m x 1.2m (All Sizes)
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Vendor
Celotex
Celotex GA4000 General Purpose PIR Insulation Board 2.4m x 1.2m (All Sizes)
  • 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
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Celotex 50mm GA4050 2.4m x 1.2m
Celotex 50mm GA4050 2.4m x 1.2m
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on orders over £300
Vendor
Celotex
Celotex 50mm GA4050 2.4m x 1.2m
Regular price
£17.15£20.58
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Celotex 100mm GA4100 2.4m x 1.2m | 100mm Celotex
Celotex 100mm GA4100 2.4m x 1.2m | 100mm Celotex
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on orders over £300
Vendor
Celotex
Celotex 100mm GA4100 2.4m x 1.2m | 100mm Celotex
Regular price
£28.99£34.79
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Celotex 25mm TB4025 2.4m x 1.2m
Celotex 25mm TB4025 2.4m x 1.2m
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on orders over £300
Vendor
Celotex
Celotex 25mm TB4025 2.4m x 1.2m
Regular price
£11.17£13.40
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£11.17 £13.40
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75mm Celotex GA4075 2.4m x 1.2m
75mm Celotex GA4075 2.4m x 1.2m
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on orders over £300
Vendor
Celotex
75mm Celotex GA4075 2.4m x 1.2m
Regular price
£23.65£28.38
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Celotex TB4000 Insulation Board 1.2m x 2.4m - 25mm to 40mm
Celotex TB4000 Insulation Board 1.2m x 2.4m - 25mm to 40mm
Free Delivery
on orders over £300
Vendor
Celotex
Celotex TB4000 Insulation Board 1.2m x 2.4m - 25mm to 40mm
  • 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
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£11.17 £13.40
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Celotex 120mm XR4120 2.4m x 1.2m
Celotex 120mm XR4120 2.4m x 1.2m
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on orders over £300
Vendor
Celotex
Celotex 120mm XR4120 2.4m x 1.2m
Regular price
£35.90£43.08
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Celotex XR4000 Insulation Board 1.2m x 2.4m - 110mm to 200mm
Celotex XR4000 Insulation Board 1.2m x 2.4m - 110mm to 200mm
Free Delivery
on orders over £300
Vendor
Celotex
Celotex XR4000 Insulation Board 1.2m x 2.4m - 110mm to 200mm
  • 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
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Celotex 40mm TB4040 2.4m x 1.2m
Celotex 40mm TB4040 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
Celotex 40mm TB4040 2.4m x 1.2m
Regular price
£16.50£19.80
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Recticel Eurothane GP (2.4m x 1.2m) All Sizes
Recticel Eurothane GP (2.4m x 1.2m) All Sizes
Free Delivery
on orders over £300
Vendor
Recticel
Recticel Eurothane GP (2.4m x 1.2m) All Sizes
  • 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
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£11.17 £13.40
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70mm Celotex GA4070 2.4m x 1.2m
70mm Celotex GA4070 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
70mm Celotex GA4070 2.4m x 1.2m
  • 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
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EPS 70 (All Sizes) 2400mm x 1200mm
EPS 70 (All Sizes) 2400mm x 1200mm
Vendor
Insulation4Less
EPS 70 (All Sizes) 2400mm x 1200mm
Regular price
£44.95£53.94
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150mm Celotex XR4150 2.4m X 1.2m | Celotex 150mm
150mm Celotex XR4150 2.4m X 1.2m | Celotex 150mm
Free Delivery
on orders over £300
Vendor
Celotex
150mm Celotex XR4150 2.4m X 1.2m | Celotex 150mm
  • Easy to install in various applications.
  • Thick PIR board with high thermal performance.
  • Manufactured with low emission standards.
Regular price
£44.90£53.88
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Celotex 60mm GA4060 2.4m x 1.2m
Celotex 60mm GA4060 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
Celotex 60mm GA4060 2.4m x 1.2m
Regular price
£22.30£26.76
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90mm Celotex GA4090 2.4m x 1.2m
90mm Celotex GA4090 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
90mm Celotex GA4090 2.4m x 1.2m
  • 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
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Celotex 30mm TB4030 2.4m x 1.2m
Celotex 30mm TB4030 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
Celotex 30mm TB4030 2.4m x 1.2m
  • 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
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£13.30 £15.96
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Kingspan Thermafloor TF70 Floor Board (All Sizes) 2.4m x 1.2m
Kingspan Thermafloor TF70 Floor Board (All Sizes) 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Kingspan
Kingspan Thermafloor TF70 Floor Board (All Sizes) 2.4m x 1.2m
  • 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
£106.95£128.34
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£106.95 £128.34
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80mm Celotex GA4080 2.4m x 1.2m
80mm Celotex GA4080 2.4m x 1.2m
Free Delivery
on orders over £300
Vendor
Celotex
80mm Celotex GA4080 2.4m x 1.2m
Regular price
£27.45£32.94
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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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Danosa Danopren TR XPS Insulation 600mm x 1250mm - All Sizes
Danosa Danopren TR XPS Insulation 600mm x 1250mm - All Sizes
Vendor
Danosa
Danosa Danopren TR XPS Insulation 600mm x 1250mm - All Sizes
  • Thermal conductivity: 0.033 W/mK
  • Environmental: CFC, HCFC, HFC-free
  • Certifications: UNE-EN 13164, EN ISO 9001
Regular price
£43.40£52.08
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£43.40 £52.08
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100% Sheepwool Insulation Comfort Roll (All Sizes)
100% Sheepwool Insulation Comfort Roll (All Sizes)
Vendor
Sheepwool
100% Sheepwool Insulation Comfort Roll (All Sizes)
Regular price
£74.90£89.88
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£74.90 £89.88
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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.
Regular price
£0.00£0.00
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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 Kooltherm K103 Floorboard (All Sizes) 2400mm x 1200mm
Kingspan Kooltherm K103 Floorboard (All Sizes) 2400mm x 1200mm
Free Delivery
on orders over £300
Vendor
Kingspan
Kingspan Kooltherm K103 Floorboard (All Sizes) 2400mm x 1200mm
  • 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
£285.00£342.00
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£285.00 £342.00
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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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Superfoil SFBA MP - All Sizes
Superfoil SFBA MP - All Sizes
Vendor
Superfoil
Superfoil SFBA MP - All Sizes
  • The Superfoil SFBA MP is a high-quality, lightweight foil insulation roll with a coverage area of 37.5m², excellent tensile strength, and superior water resistance.
  • Constructed from 2 Aluminium Metalized PET layers and 1 layer of air bubble, it offers robust insulation performance and durability.
  • It has a Class E fire rating when installed behind plasterboard, ensuring safety along with high performance.
Regular price
£77.90£93.48
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£77.90 £93.48
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Superfoil General Purpose Wrap 3mm x 7m x 1m
Superfoil General Purpose Wrap 3mm x 7m x 1m
Vendor
Superfoil
Superfoil General Purpose Wrap 3mm x 7m x 1m
  • Superfoil General Purpose Wrap is a lightweight, durable insulation material with dimensions of 7m x 1m x 3mm, made from 2 Aluminium Metalized PET Layers and 1 layer Air Bubble for optimal thermal performance.
  • It boasts impressive tensile properties and resistance to tearing, excellent water vapour resistance and a resistance to water penetration rating of W1, ensuring durability and protection against moisture and water damage.
  • The product offers a thermal resistance of 0.12 R Value for effective insulation and energy efficiency, and has a fire rating of Class E when installed behind plasterboard for added safety.
Regular price
£24.90£29.88
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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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SuperFOIL SFUF 6mm x 1.5m x 8m
SuperFOIL SFUF 6mm x 1.5m x 8m
Vendor
Superfoil
SuperFOIL SFUF 6mm x 1.5m x 8m
  • The SuperFOIL SFUF is a durable, high-quality insulation product with excellent tensile properties, resistance to water and tearing, and a coverage area of 12m².
  • It offers superior thermal performance with a thermal resistance of 0.8 R Value, a fire rating of Class E, and can withstand damp and humid conditions effectively.
  • Despite its robust performance, it is easy to install, making it suitable for a wide range of demanding insulation applications.
Regular price
£96.45£115.74
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£96.45 £115.74
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SuperFOIL SF19 Plus (All Sizes)
SuperFOIL SF19 Plus (All Sizes)
Vendor
Superfoil
SuperFOIL SF19 Plus (All Sizes)
  • The Superfoil SF19 Plus is a high-quality, durable insulation product with superior thermal resistance, excellent tensile properties, and resistance to tearing.
  • It offers effective resistance to water penetration and vapour, making it ideal for areas prone to moisture or dampness, and has a high thermal resistance with a 1.63 R value.
  • The product also boasts a fire rating of Class E (behind plasterboard), adding an extra layer of safety to building projects.
Regular price
£101.15£121.38
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£101.15 £121.38
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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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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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SuperFOIL SF40 65mm x 1.5m x 10m
SuperFOIL SF40 65mm x 1.5m x 10m
Vendor
Superfoil
SuperFOIL SF40 65mm x 1.5m x 10m
  • The Superfoil SF40 65mm x 1.5m x 10m is a high-performance insulation product by Superfoil, composed of multiple layers of foil and loft quilt, offering superior thermal resistance and durability.
  • Despite its large coverage area of 15m², it is lightweight at 15kg and has impressive tensile properties, water vapour resistance, and resistance to water penetration and tearing.
  • It is rated Class E for fire resistance, making it a safe and reliable choice for various construction projects.
Regular price
£199.99£239.99
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Superfoil SF6 30mm x 1.2m x 10m
Superfoil SF6 30mm x 1.2m x 10m
Vendor
Superfoil
Superfoil SF6 30mm x 1.2m x 10m
  • Superfoil SF6 is a high-quality, lightweight insulation material with superior thermal resistance, excellent tensile properties, and resistance to water penetration.
  • It is constructed from a unique combination of materials, including mesh reinforced foil laminated outer layers, aluminium coated reflective foil PET layer, thermo foam separation layer, and loft quilt layers.
  • With a fire rating of Class E (behind plasterboard), it is a safe choice for insulation needs, providing a sleek and professional finish to projects.
Regular price
£75.25£90.30
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£75.25 £90.30
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Celotex XR4200 200mm x 2.4m x 1.2m (Pallet of 12)
Celotex XR4200 200mm x 2.4m x 1.2m (Pallet of 12)
Free Delivery
on orders over £300
Vendor
Celotex
Celotex XR4200 200mm x 2.4m x 1.2m (Pallet of 12)
  • 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
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£935.40 £1,122.48
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PIR-Plywood Laminate Insulation Board (All Sizes) - 2.4m x 1.2m
PIR-Plywood Laminate Insulation Board (All Sizes) - 2.4m x 1.2m
Vendor
Mannok
PIR-Plywood Laminate Insulation Board (All Sizes) - 2.4m x 1.2m
  • Composite insulation board for warm flat roof decks
  • PIR foam core with aluminum facings and 6mm WPB plywood layer
  • Provides strength, rigidity, and minimal thickness for easy installation in new or refurbishment projects.
Regular price
£1,283.33£1,540.00
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£1,283.33 £1,540.00
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Superfoil SF60 100mm x 1.5m x 8m
Superfoil SF60 100mm x 1.5m x 8m
Vendor
Superfoil
Superfoil SF60 100mm x 1.5m x 8m
  • 3-in-1: Vapour control, Radiant Barrier, Foil Insulation
  • DIBT & CE Certified; Fire-resistant, Water-tight
  • For Roof, Wall, Floor; High Thermal Resistance; Easy Install
Regular price
£224.95£269.94
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£224.95 £269.94
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Sheepwool Lose Wool - 5Kg Pack
Sheepwool Lose Wool - 5Kg Pack
Vendor
Sheepwool
Sheepwool Lose Wool - 5Kg Pack
Regular price
£49.89£59.87
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Window and Door Filler Untied 200m Roll
Window and Door Filler Untied 200m Roll
Vendor
Sheepwool
Window and Door Filler Untied 200m Roll
Regular price
£79.85£95.82
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£79.85 £95.82
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Thermafleece SupaSoft Roll
Thermafleece SupaSoft Roll
Vendor
Thermafleece
Thermafleece SupaSoft Roll
Regular price
£49.62£59.54
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£49.62 £59.54
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Thermafleece CosyWool Roll
Thermafleece CosyWool Roll
Vendor
Thermafleece
Thermafleece CosyWool Roll
Regular price
£84.95£101.94
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Danosa 75mm XPS Concrete Slab Grey - 500mm x 500mm
Danosa 75mm XPS Concrete Slab Grey - 500mm x 500mm
Vendor
Danosa
Danosa 75mm XPS Concrete Slab Grey - 500mm x 500mm
Regular price
£10.56£12.67
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£10.56 £12.67
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Superfoil SFNC 20mm x 1.2m x 9.5m
Superfoil SFNC 20mm x 1.2m x 9.5m
Vendor
Superfoil
Superfoil SFNC 20mm x 1.2m x 9.5m
  • SuperFOIL SFNC is a high-quality, multi-layer insulation product offering superior thermal and acoustic performance, ideal for various building applications.
  • It is easy to install, fits in minimal space, and is resistant to water and vapour, making it a versatile and practical choice for both new builds and renovations.
  • Using this product can improve the insulation of properties, reduce energy costs, and create a more comfortable and quieter environment.
Regular price
£321.22£385.46
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£321.22 £385.46
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Recticel Eurowall+ Full-Fill Cavity 1.2m x 0.46m
Recticel Eurowall+ Full-Fill Cavity 1.2m x 0.46m
Free Delivery
on orders over £300
Vendor
Recticel
Recticel Eurowall+ Full-Fill Cavity 1.2m x 0.46m
  • Eurowall® + is a high-performance thermal insulation board made of rigid polyisocyanurate PIR foam and faced with a gas diffusion tight multilayer foil.
  • It features precision cut tongue and groove joints on all sides for minimized heat loss and increased protection against wind and rain.
  • Designed with a 10mm cavity requirement, it allows space for conventional bricklaying techniques.
Regular price
£522.39£626.87
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£522.39 £626.87
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Suspended Timber Floor Insulation

The main reason for installing thermal insulation under your floors is to prevent heat loss from gaps between the floorboards.

Installing insulation under your floors is a great step towards having full control over your home's temperature. It is a quick way of transforming your home into a more comfortable atmosphere with a balance of temperature. This is done by fixing insulation between the joists beneath your floors, and this can apply for both renovation projects and new houses. Especially in colder areas, it is essential to keep your homes warm and preserve the heat within. Insulation comes in many thicknesses, to achieve the optimum results it is important that you first figure out the right thickness of insulation needed to meet your desired U-value.

Suspended Timber Floor

Why install suspended Floor insulation?
Condensation build up and damping can result in damaged floors/ rotten furniture over time. Suspended Floor Insulation allows you take control of heat transfer and prevent condensation build up. This will keep your home in tip-top condition and prevent any nasty experiences with condensation/ damping.

Suspended floor insulation is very useful in strengthening the foundation of your floors as they add support between joists meaning you should expect a sturdier floor in the long run.

The major reason for installing thermal insulation under your suspended floors is to prevent heat loss from gaps within the houses shell. You will immediately notice a more cosy and balanced room temperature once you have installed suspended floor insulation.

Timber floor Insulation

There are many ways to install them and various materials to work on. The materials that can be used for Suspended floor Insulation-



• PIR thermal Insulation board (Kingspan /Celotex). Thicknesses of 50mm and 100mm are among the most common thicknesses chosen however we here at insulation4less aim to give you the widest range of options possible.
• Mineral Wool Insulation in slab form (Rolls or batts).
• Hemp and sheep wool are great natural materials for floors.

These suspended floor insulations are a very cost effective and have great uses even with protection against sound. They work as a shield against noise, blocking it from entering your home from beneath your floors.

Things to keep in mind before Installing above the floor joists-
• The floorboards must be installed before insulating the floor.
• You must cut the installation boards according to the required size so that they can easily fit.
• You must use galvanized steel saddle clips, nails and softwood timber battens.
• Make sure that the thickness of these boards according to the joists is placed accordingly.

Things to keep in mind before installing below floor joists-
• The floorboards have to be placed over joists before you can fit the insulation boards from below.
• The insulation boards need to fit tightly over the joist so that there are no chances of air gaps.

Fireproofing – Insulation in general helps prevent fire within the home. Suspended floor insulation is no different, it is a great step towards home fire safety. The risk of short circuits within the home is a very serious issue. Short circuits can ignite a fire within your home that can spread quickly. Choosing the right type of insulation will prevent this from taking place.

A Little Bit About Suspended Timber Floors
Timber floors are ideal in areas that tend to have frequently fluctuating weather conditions. Timer is very cost effective and commonly used by builders. Timber flooring combined with high quality insulation can help reduce carbon footprint and CO2 content in the air as well. Electricity bills will immediately decrease as a result of well insulated timber flooring.

If you are looking for high quality suspended floor insulation, then Insulation4less is the best option for you. We have all kinds of insulators available and for very affordable prices. Our company has maintained its reputation in the market, providing quality services and products to its customers. Insulation4Less have a support team eager and waiting to help you with any inquiries. Do not hesitate to get in touch!

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