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Insulation Board By Thickness
Insulation board by thickness focuses on picking the right board depth for each application, rather than focusing solely on brands or materials. This category allows you to compare insulation thicknesses side by side. This makes it easier to choose insulation that fits each space and gives the performance required for the build.
What is insulation board thickness?
Insulation board thickness means the insulation board’s actual depth. Thickness is especially useful when space is limited or where drawings specify a precise insulation size.
This category groups insulation boards by different thicknesses. Browse the listed products and compare options like 25mm, 50mm, 75mm, 100mm, and above in one place.
What are the different insulation board thicknesses used for?
Different insulation board thicknesses are suited to different parts of a building and performance requirements.
Thinner insulation boards (15–42.5mm)
Best for internal wall lining and within floor build-ups where space is limited. Also used to upgrade insulation without moving windows or doors. They enhance thermal performance without major changes to the structure.
Mid-range boards (50–100mm)
Ideal for walls, floors, and roofs. Often used in refurbishments and extensions where a balance between thermal performance and build-up is required.
Thicker insulation board options (110–200mm)
These thicknesses are preferred for roofs and external walls. Thick insulation boards provide stronger resistance to heat loss, helping meet current UK Building Regulations and energy-efficiency targets.
Benefits of choosing the right insulation board thickness
Varying insulation thicknesses give builders and homeowners great flexibility when upgrading or designing a property.
For instance, older homes were not designed with modern insulation in mind. Being able to choose thinner or mid-range boards makes it possible to upgrade spaces without major disruption to the existing structure. On the other hand, new builds benefit from thicker options that maximise energy efficiency from day one.
Different thicknesses also help balance:
- Thermal performance – how well heat transfer is slowed.
- Available space – what will physically fit.
- Cost control – thicker is not always necessary for every area.
It becomes easier to combine a range of insulation board thicknesses across a project so you do not over-insulate one area and under-insulate another.
At Insulation Wholesale, you can purchase Insulation Board By Thickness at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
FAQ
Where to buy Insulation board by thickness?
You can buy all insulation Board thicknesses right here at Insulation Wholesale. We stock a wide range of insulation boards by thickness, so you do not have to compromise on material depth. Our team understands the importance of clear sizing and reliable stock. Order your preferred insulation thickness Board online for competitive pricing and fast delivery.
What insulation board thicknesses are there?
Insulation boards commonly range from 20mm to 150mm and above. Some brands offer higher thicknesses beyond 150mm, reaching 200mm and thicker for custom orders. In this category, all our boards are grouped by thickness for easy comparison.
What is the thickest insulation board available?
The thickest insulation is 120mm to 200mm and thicker, mainly used in roofs, external walls, and high-performance builds where energy efficiency is a priority. These thicknesses offer significantly higher resistance to heat loss.
Insulation Board By Thickness Range
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20mm Insulation Board (6)
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25mm Insulation Board (24)
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27mm Insulation Board (1)
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30mm Insulation Board (14)
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37.5mm Insulation Board (5)
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40mm Insulation Board (15)
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42.5mm Insulation Board (1)
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50mm Insulation Board (38)
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50.5mm Insulation Board (1)
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52.5mm Insulation Board (5)
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57.5mm Insulation Board (1)
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60mm Insulation Board (28)
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62.5mm Insulation Board (6)
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70mm Insulation Board (15)
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72.5mm Insulation Board (5)
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75mm Insulation Board (23)
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80mm Insulation Board (25)
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82.5mm Insulation Board (3)
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90mm Insulation Board (19)
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92.5mm Insulation Board (1)
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100mm Insulation Board (35)
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110mm Insulation Board (10)
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115mm Insulation Board (3)
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120mm Insulation Board (22)
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125mm Insulation Board (4)
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130mm Insulation Board (15)
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140mm Insulation Board (16)
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150mm Insulation Board (22)
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165mm Insulation Board (2)
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200mm Insulation Board (1)
Showing 1–36 of 158
Products in Insulation Board By Thickness
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100mm Celotex CW4100 Cavity Wall Insulation Board 1200mm x 450mm 3.24m2 Pack of 6 (3.24m2)
100mm Celotex CW4100 Cavity Wall Insulation Board is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing.
£63.73£76.48 Ex VATInc VAT£19.67£23.60 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.
£41.28£49.54 Ex VATInc VAT£14.33£17.20 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.
£41.45£49.74 Ex VATInc VAT£14.39£17.27 Per M2 Add to cart -
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.
£374.89£449.87 Ex VATInc VAT£21.70£26.04 Per M2 Add to cart -
100mm Jablite HP+ 70E External Wall Insulation Board 1200mm x 600mm (4′ X 2′) Pack of 6 (4.32m2)
100mm Jablite HP+ 70E External Wall Insulation Board is designed to enhance thermal efficiency for external walls. It can be bonded or mechanically fixed, providing reliable insulation solution.
£54.70£65.64 Ex VATInc VAT£12.66£15.19 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.
£64.92£77.90 Ex VATInc VAT£21.64£25.97 Per M2 Add to cart -
100mm Kingspan Kooltherm K103 Insulation Floorboard 2400mm x 1200mm Pack of 3 (8.64m2)
100mm Kooltherm K103 is a premium phenolic core floor insulation solution, designed to deliver exceptional performance with solid concrete or suspended timber floors.
£326.98£392.38 Ex VATInc VAT£37.84£45.41 Per M2 Add to cart -
100mm Kingspan Kooltherm K107 Pitched Roof Board 2400mm x 1200mm Pack of 3 (8.64m2)
100mm Kingspan Kooltherm K107 Pitched Roof Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core. It is used to insulate pitched roofs and attic spaces, and has a thermal conductivity of just 0.019 W/m.K across all thicknesses.
£331.96£398.35 Ex VATInc VAT£38.42£46.10 Per M2 Add to cart -
100mm Kingspan Kooltherm K108 Cavity Board Insulation 1200mm x 450mm Pack of 5 (2.70m2)
100mm Kingspan Kooltherm K108 partial fill cavity wall board is a premium performance lower lambda insulation with a rigid thermoset fibre-free phenolic core. It is faced on both sides with a low emissivity composite foil facing and is used in partially filled cavity walls.
£116.83£140.20 Ex VATInc VAT£43.27£51.92 Per M2 Add to cart -
100mm Kingspan Thermaroof TR24 Flat Roof PIR Insulation Board 1200mm x 600mm Pack of 5 (3.60m2)
100mm Kingspan Thermaroof TR24 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. Kingspan Thermaroof is suitable for flat roofs waterproofed with partially bonded torch applied multi-layer bituminous waterproofing.
£127.49£152.99 Ex VATInc VAT£35.41£42.49 Per M2 Add to cart -
100mm Kingspan Thermaroof TR26 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 3 (8.64m2)
100mm Kingspan TR26 Thermaroof is high-performance insulation that has a fiber-free rigid thermoset polyisocyanurate (PIR) core. Suitable for flat roof application waterproofed with mechanically fixed single-ply waterproofing.
£267.59£321.11 Ex VATInc VAT£30.97£37.16 Per M2 Add to cart -
100mm Kingspan Thermaroof TR27 PIR Insulation Board 1200mm x 1200mm Pack of 4 (5.76m2)
100mm Kingspan Thermaroof TR27 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. It is used to insulate flat roofs waterproofed with fully adhered single-ply, partially bonded built-up felt, mastic asphalt and cold liquid applied waterproofing.
£183.59£220.31 Ex VATInc VAT£31.87£38.24 Per M2 Add to cart -
100mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
100mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£39.98£47.98 Ex VATInc VAT£13.88£16.66 Per M2 Add to cart -
100mm Unilin Safe-R SR/CW Partial Fill Cavity Wall Phenolic Insulation Board 1200mm x 450mm Pallet of 120 (64.80m2)
100mm Unilin Safe-R SR/CW Partial Fill Phenolic Cavity Wall Insulation Board is a high-performance insulation product specifically designed to enhance the thermal efficiency of cavity wall systems.
POA Get a quote -
110mm Kingspan Thermaroof TR26 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 3 (8.64m2)
110mm Kingspan TR26 Thermaroof is high-performance insulation that has a fiber-free rigid thermoset polyisocyanurate (PIR) core. Suitable for flat roof application waterproofed with mechanically fixed single-ply waterproofing.
£299.00£358.80 Ex VATInc VAT£34.61£41.53 Per M2 Add to cart -
110mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
110mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£48.84£58.61 Ex VATInc VAT£16.96£20.35 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 -
115mm Celotex Thermaclass Cavity Wall 21 Insulation Board 1190mm x 450mm Pack of 5 (2.67m2)
115mm Celotex Thermaclass Cavity Wall 21 is a PIR T&G insulation board designed for full-fill cavity wall applications. Low-emissivity foil facing provides versatility during installation, allowing for a 10mm residual cavity.
£137.98£165.58 Ex VATInc VAT£51.68£62.02 Per M2 Add to cart -
115mm Kingspan Kooltherm K106 Cavity Board Insulation 1200mm x 450mm Pack of 4 (2.16m2)
115mm Kingspan Kooltherm K106 Cavity Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core with a thermal conductivity of just 0.019 W/mK across all thicknesses.
£113.03£135.64 Ex VATInc VAT£52.33£62.80 Per M2 Add to cart -
120mm Celotex XR4120 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Celotex XR4120 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.
£51.94£62.33 Ex VATInc VAT£18.03£21.64 Per M2 Add to cart -
120mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm 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.
£52.08£62.50 Ex VATInc VAT£18.08£21.70 Per M2 Add to cart -
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 -
120mm Kingspan Kooltherm K103 Insulation Floorboard 2400mm x1200mm Pack of 2 (5.76m2)
120mm Kooltherm K103 is a premium phenolic core floor insulation solution, designed to deliver exceptional performance with solid concrete or suspended timber floors.
£265.38£318.46 Ex VATInc VAT£46.07£55.28 Per M2 Add to cart -
120mm Kingspan Kooltherm K107 Pitched Roof Board 2400mm x 1200mm Pack of 2 (5.76m2)
120mm Kingspan Kooltherm K107 Pitched Roof Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core. It is used to insulate pitched roofs and attic spaces, and has a thermal conductivity of just 0.019 W/m.K across all thicknesses.
£265.38£318.46 Ex VATInc VAT£46.07£55.28 Per M2 Add to cart -
120mm Kingspan Kooltherm K112 Framing Insulation Board 2400mm x 1200mm Pack of 2 (5.76m2)
120mm Kingspan Kooltherm K112 Framing Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core. It is used to insulate timber and steel framing systems with thermal conductivity of just 0.019 W/mK across all thicknesses.
£333.92£400.70 Ex VATInc VAT£57.97£69.56 Per M2 Add to cart -
120mm Kingspan Thermaroof TR24 Flat Roof PIR Insulation Board 1200mm x 600mm Pack of 4 (2.88m2)
120mm Kingspan Thermaroof TR24 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. Kingspan Thermaroof is suitable for flat roofs waterproofed with partially bonded torch applied multi-layer bituminous waterproofing.
£114.93£137.92 Ex VATInc VAT£39.91£47.89 Per M2 Add to cart -
120mm Kingspan Thermaroof TR26 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 2 (5.76m2)
120mm Kingspan TR26 Thermaroof is high-performance insulation that has a fiber-free rigid thermoset polyisocyanurate (PIR) core. Suitable for flat roof application waterproofed with mechanically fixed single-ply waterproofing.
£200.81£240.97 Ex VATInc VAT£34.86£41.83 Per M2 Add to cart -
120mm Kingspan Thermaroof TR27 PIR Insulation Board 1200mm x 1200mm Pack of 4 (5.76m2)
120mm Kingspan Thermaroof TR27 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. It is used to insulate flat roofs waterproofed with fully adhered single-ply, partially bonded built-up felt, mastic asphalt and cold liquid applied waterproofing.
£205.95£247.14 Ex VATInc VAT£35.76£42.91 Per M2 Add to cart -
120mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
120mm Recticel Eurothane GP is a polyisocyanurate (PIR) insulation core with composite aluminium foil facings on both sides. Recticel is a multi-purpose insulation board suitable for use in pitched roofs, ceilings, floors and walls.
£49.31£59.17 Ex VATInc VAT£17.12£20.54 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.
£324.90£389.88 Ex VATInc VAT£28.20£33.84 Per M2 Add to cart -
130mm Kingspan Thermaroof TR24 Flat Roof PIR Insulation Board 1200mm x 600mm Pack of 3 (2.16m2)
130mm Kingspan Thermaroof TR24 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. Kingspan Thermaroof is suitable for flat roofs waterproofed with partially bonded torch applied multi-layer bituminous waterproofing.
£92.35£110.82 Ex VATInc VAT£42.75£51.30 Per M2 Add to cart -
130mm Kingspan Thermaroof TR27 PIR Insulation Board 1200mm x 1200mm Pack of 3 (4.32m2)
130mm Kingspan Thermaroof TR27 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. It is used to insulate flat roofs waterproofed with fully adhered single-ply, partially bonded built-up felt, mastic asphalt and cold liquid applied waterproofing.
£166.60£199.92 Ex VATInc VAT£38.56£46.27 Per M2 Add to cart -
140mm Celotex XR4140 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
140mm Celotex XR4140 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.
£60.18£72.22 Ex VATInc VAT£20.90£25.08 Per M2 Add to cart
