Concrete Floor Insulation
Concrete floor insulation is essential in modern construction, as it helps create comfortable, energy-efficient spaces. It is designed to reduce heat loss through the floor while maintaining load-bearing strength.
What are concrete floor insulation boards?
Concrete floor insulation boards are specialised rigid panels designed for installation underneath or above concrete slabs. They are made from high-performance materials such as PIR (polyisocyanurate), EPS (expanded polystyrene), XPS (extruded polystyrene ) or advanced vacuum insulation boards. When installed, these panels form a continuous thermal layer to prevent heat from escaping into the ground.
What is concrete insulation used for?
Concrete insulation is primarily used to improve the thermal efficiency of solid or ground floors. It is suitable for homes (kitchens, living rooms, and extensions), garages, and commercial workshops where strength and insulation are both essential.
Depending on the type of building, its function, and the weight it supports, you will need an insulant with the correct compressive strength to withstand pressure without losing performance.
For instance, garages and loading bay floors require an insulant with a higher compressive strength than standard living spaces.
Types of concrete floor insulation
There are various types of insulation suited for concrete slabs:
PIR insulation boards
These are lightweight boards that offer outstanding insulation and moisture resistance.
Kingspan Optim-R Boards
OPTIM-R boards are thin vacuum insulation panels. Despite their slim profiles, they deliver high thermal performance and are perfect for low-floor-height projects.
EPS insulation boards
These are expanded polystyrene panels. They are cost-effective and simple to install.
XPS insulation boards
These are eco-friendly panels certified for low chemical emissions, supporting healthier indoor air quality and sustainable construction.
Benefits of insulation for concrete floors
Concrete floor insulation offers numerous benefits for property owners. Some of these are:
- Better heat retention, energy efficiency, and lower energy costs.
- Enhanced comfort with warmer indoor surfaces.
- Reduced carbon emissions.
- Protection against cold bridging and condensation.
- Lasting performance.
- Minimal maintenance.
Why choose our concrete floor insulation?
- We stock a wide selection of premium insulation for concrete floors from the UK’s leading brands.
- Each product is developed to comply with UK Building Regulations and deliver reliable performance.
- We aim to deliver within 1-3 working days, unless stated otherwise on the product page or during checkout.
Enhance your build with precision-engineered concrete floor insulation from Insulation Wholesale. Explore our premium range of concrete floor insulation boards, built to deliver outstanding energy efficiency and durability. Order online today for fast, reliable UK delivery.
FAQ
How thick should concrete floor insulation be?
The ideal insulation thickness for your project will depend on the specific performance requirements you hope to fulfil and your target U-values. UK Building Regulations require around 100–150mm of rigid board insulation for most concrete slab floors.
What size insulation for a concrete floor?
Concrete floor insulation boards are normally 2400mm (L) x 1200mm (W), though sizes may vary slightly between manufacturers, so always check product datasheets. For example, Kingspan also offers 1250mm x 600mm XPS boards for concrete floor insulation.
The best way to know whether you have chosen the correct insulation size is to check the manufacturer’s recommendations for use. The product details will tell you if the product is compatible with your floor layout.
How to lay concrete floor insulation?
Begin by laying a damp-proof membrane (DPM). Follow this with the placement of the boards, positioning them close together. Seal all edges with tape if required, and then add a separating layer. Finish by pouring the concrete screed on top.
For above-slab systems, insulation sits beneath the screed layer; for below-slab systems, install insulation over the sub-base before the DPM.
Showing 1–32 of 158 results
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100mm Expanded Polystyrene EPS100 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
100mm EPS100, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£502.65£603.18 Ex VATInc VAT£7.27£8.72 Per M2 Add to cart -
100mm Expanded Polystyrene EPS150 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 6 (17.28m2)
100mm EPS150, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£192.51£231.01 Ex VATInc VAT£11.14£13.37 Per M2 Add to cart -
100mm Expanded Polystyrene EPS200 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 6 (17.28m2)
100mm EPS200, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£340.37£408.44 Ex VATInc VAT£19.70£23.64 Per M2 Add to cart -
100mm Expanded Polystyrene EPS250 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 6 (17.28m2)
100mm EPS250, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£401.81£482.17 Ex VATInc VAT£23.25£27.90 Per M2 Add to cart -
100mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 4 (3.00m2)
100mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering a thermal conductivities as low as 0.033 W/mK.
£61.58£73.90 Ex VATInc VAT£20.53£24.64 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 -
120mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 3 (2.25m2)
120mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering a thermal conductivities as low as 0.033 W/m·K
£59.33£71.20 Ex VATInc VAT£26.37£31.64 Per M2 Add to cart -
130mm Expanded Polystyrene EPS250 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
130mm EPS250, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£289.83£347.80 Ex VATInc VAT£25.16£30.19 Per M2 Add to cart -
150mm Expanded Polystyrene EPS100 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)
150mm EPS100, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£434.50£521.40 Ex VATInc VAT£12.57£15.08 Per M2 Add to cart -
150mm Expanded Polystyrene EPS150 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
150mm EPS150, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£200.01£240.01 Ex VATInc VAT£17.36£20.83 Per M2 Add to cart -
150mm Expanded Polystyrene EPS200 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
150mm EPS200, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£340.37£408.44 Ex VATInc VAT£29.55£35.46 Per M2 Add to cart -
150mm Expanded Polystyrene EPS250 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
150mm EPS250, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£401.73£482.08 Ex VATInc VAT£34.87£41.84 Per M2 Add to cart -
150mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 2 (1.50m2)
150mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering a thermal conductivities as low as 0.034 W/m·K.
Non-refundable.
£46.18£55.42 Ex VATInc VAT£30.79£36.95 Per M2 Add to cart -
25mm Expanded Polystyrene EPS100 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS100, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£131.16£157.39 Ex VATInc VAT£1.90£2.28 Per M2 Add to cart -
25mm Expanded Polystyrene EPS150 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS150, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£199.81£239.77 Ex VATInc VAT£2.89£3.47 Per M2 Add to cart -
25mm Expanded Polystyrene EPS200 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS200, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£340.52£408.62 Ex VATInc VAT£4.93£5.92 Per M2 Add to cart -
25mm Expanded Polystyrene EPS250 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 24 (69.12m2)
25mm EPS250, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£399.67£479.60 Ex VATInc VAT£5.78£6.94 Per M2 Add to cart -
30mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 14 (10.50m2)
30mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering a thermal conductivities as low as 0.033 W/m·K
£64.73£77.68 Ex VATInc VAT£6.16£7.39 Per M2 Add to cart -
40mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 10 (7.50m2)
40mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering thermal conductivities as low as 0.033 W/m·K
£61.55£73.86 Ex VATInc VAT£8.21£9.85 Per M2 Add to cart -
50mm Expanded Polystyrene EPS100 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)
50mm EPS100, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£154.44£185.33 Ex VATInc VAT£4.47£5.36 Per M2 Add to cart -
50mm Expanded Polystyrene EPS150 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)
50mm EPS150, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
Non- refundable.
£200.11£240.13 Ex VATInc VAT£5.79£6.95 Per M2 Add to cart -
50mm Expanded Polystyrene EPS200 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)
50mm EPS200, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£340.37£408.44 Ex VATInc VAT£9.85£11.82 Per M2 Add to cart -
50mm Expanded Polystyrene EPS250 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 12 (34.56m2)
50mm EPS250, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
Non- refundable.
£400.44£480.53 Ex VATInc VAT£11.59£13.91 Per M2 Add to cart -
50mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 8 (6.00m2)
50mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering a thermal conductivities as low as 0.033 W/m·K
£61.61£73.93 Ex VATInc VAT£10.27£12.32 Per M2 Add to cart -
60mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 7 (5.25m2)
60mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering a thermal conductivities as low as 0.033 W/m·K
£68.11£81.73 Ex VATInc VAT£12.97£15.56 Per M2 Add to cart -
75mm Expanded Polystyrene EPS100 Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 32 (92.16m2)
75mm EPS100, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£582.27£698.72 Ex VATInc VAT£6.32£7.58 Per M2 Add to cart -
75mm Expanded Polystyrene EPS150 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 8 (23.04m2)
75mm EPS150, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£199.99£239.99 Ex VATInc VAT£8.68£10.42 Per M2 Add to cart -
75mm Expanded Polystyrene EPS200 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 8 (23.04m2)
75mm EPS200, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£327.68£393.22 Ex VATInc VAT£0.40£0.48 Per M2 Add to cart -
75mm Expanded Polystyrene EPS250 Floor Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 8 (23.04m2)
75mm EPS250, often known as Expanded Polystyrene, is a lightweight foam product produced from tiny polystyrene beads. Due to its high thermal value and simplicity of usage, it is commonly used as one of the most favoured insulation materials in construction.
£400.44£480.53 Ex VATInc VAT£17.38£20.86 Per M2 Add to cart -
80mm Kingspan GreenGuard GG300 R Rigid Extruded Polystyrene Insulation Board 1250mm x 600mm Pack of 5 (3.75m2)
80mm Kingspan GreenGuard GG300 is a high performance rigid extruded polystyrene insulation. It is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring offering a thermal conductivities as low as 0.033 W/m·K
£61.55£73.86 Ex VATInc VAT£16.41£19.69 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.
£39.89£47.87 Ex VATInc VAT£13.85£16.62 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.
£37.78£45.34 Ex VATInc VAT£13.12£15.74 Per M2 Add to cart
