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75mm Celotex CW4075 Cavity Wall Insulation Board 1200mm x 450mm 4.32m2 Pack of 8 (4.32m2)
75mm Celotex CW4075 Cavity Wall Insulation Board is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing.
£66.11£79.33 Ex VATInc VAT£15.30£18.36 Per M2 Add to cart -
75mm Celotex GA4075 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
75mm Celotex GA4075 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.
£34.26£41.11 Ex VATInc VAT£11.90£14.28 Per M2 Add to cart -
75mm Ecotherm Eco-Versal Rigid PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
75mm 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.
£34.38£41.26 Ex VATInc VAT£11.94£14.33 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.
£374.89£449.87 Ex VATInc VAT£16.27£19.52 Per M2 Add to cart -
75mm Kingspan Kooltherm K103 Insulation Floorboard 2400mm x 1200mm Pack of 4 (11.52m2)
75mm Kooltherm K103 is a premium phenolic core floor insulation solution, designed to deliver exceptional performance with solid concrete or suspended timber floors.
£337.53£405.04 Ex VATInc VAT£29.30£35.16 Per M2 Add to cart -
75mm Kingspan Kooltherm K107 Pitched Roof Board 2400mm x 1200mm Pack of 4 (11.52m2)
75mm 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.
£343.06£411.67 Ex VATInc VAT£29.78£35.74 Per M2 Add to cart -
75mm Kingspan Kooltherm K108 Cavity Board Insulation 1200mm x 450mm Pack of 6 (3.24m2)
75mm 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.
£102.71£123.25 Ex VATInc VAT£31.70£38.04 Per M2 Add to cart -
75mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
75mm 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.
£33.02£39.62 Ex VATInc VAT£11.47£13.76 Per M2 Add to cart
75mm Insulation Board
A 75mm insulation board is a rigid panel used to reduce heat transfer through a building. It is common on refurbishment jobs, extensions, and higher-performance assemblies in new builds.
What is 75mm insulation board?
A 75mm thick insulation board is a factory-manufactured rigid panel with a fixed insulation thickness running through it. This thickness is often specified when designers are targeting specific U-values rather than simply improving thermal comfort.
The average 75mm thick insulation board is made from rigid insulation foams (such as PIR or phenolic) or expanded polystyrene (EPS). Unlike rolls, it does not sag or slump over time. Once fixed in place, it remains dimensionally stable.
Most are manufactured in standard sizes such as 75mm insulation board 1200mmx2400mm, which makes setting out easier and reduces wastage.
What is 75mm thick insulation board used for?
A 75mm insulation thickness board is used in areas where heat loss is high and thinner insulation would fall short. It is mostly installed in:
- External wall systems and internal wall upgrades
- Pitched roofs between or below rafters, where permitted by the roof build-up design
- Flat roofs as part of a layered warm roof build-up
- Floors where headroom allows deeper insulation
75mm insulation is often specified to help meet Building Regulations requirements rather than simply improve comfort.
Types of insulation in 75mm thickness board
The three main insulation types available at this thickness are:
EPS Insulation (expanded polystyrene)
A cost-effective, lightweight option that is easy to cut. It insulates well but needs more thickness than other materials to achieve the same performance. However, it delivers consistent performance and has good moisture resistance when correctly specified and installed.
Phenolic Insulation foam board
Phenolic boards offer very high thermal resistance relative to thickness. That means you get strong performance without going thicker. However, phenolic board edges are fragile and need careful handling.
PIR Insulation (polyisocyanurate)
A 75mm PIR insulation board is one of the most popular choices on site. PIR offers a good balance of thermal performance, strength, and workability. A 75mm rigid insulation board made from PIR is easy to fix, trims cleanly, and is suitable for many wall, roof, and floor build-ups.
FAQ
Is 75mm insulation enough for walls?
In many situations, yes. A 75mm insulation thickness board provides solid thermal performance for both refurbishments and new builds. Whether it is enough depends on the wall type, existing construction, and the target U-value.
In older buildings, adding a 75mm thick insulation board often brings a dramatic improvement. In new builds, it may be used alongside other layers as part of a wider insulation system
How to fix 75mm insulation board?
- Walls: Mechanically fix the boards to masonry or timber, often with supplementary adhesive.
- Roofs: Fix boards between or below rafters using screws and washers.
- Floors: Boards are usually laid tightly together, either loose-laid (floating) or mechanically restrained, depending on the floor system.
How to cut 75mm insulation board?
Use:
- A fine-tooth hand saw, or insulation saw
- A straight edge to guide the cut
- A stable surface so the board does not bend
Score the facing material first, then cut through the insulation core in steady passes.
Where to buy a 75mm insulation board?
You can buy an insulation 75mm thickness board online from Insulation Wholesale. We stock EPS, phenolic, and PIR options in this thickness, ready to go from UK stock. Our team supports trade and commercial projects, so we offer trade discounts, pallet deals, and a fast quote process when you need numbers quickly. We focus on low wholesale pricing and fast nationwide delivery, including delivery to your site.
