75mm 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.
75mm Insulation Board Thermal
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.
At Insulation Wholesale, you can purchase 75mm Insulation Board at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
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.
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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.
£66.13£79.36 Ex VATInc VAT£15.31£18.37 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.
£37.23£44.68 Ex VATInc VAT£12.93£15.52 Per M2 Add to cart -
75mm Ecotherm Eco-Cavity Partial Fill Insulation Board 1200mm x 450mm Pack of 6 (3.24m2)
75mm Ecotherm Eco-Cavity wall insulation boards are ideal for masonry walls. They achieve high levels of thermal performance for thinner constructions whilst maintaining a clear residual air gap; effective protection against driving rain, particularly in coastal and exposed locations.
POA Get a quote -
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.
£36.12£43.34 Ex VATInc VAT£12.54£15.05 Per M2 Add to cart -
75mm IKO Enertherm ALU PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
75mm IKO Enertherm ALU PIR (polyisocyanurate) insulation is a top-quality insulation board featuring a rigid PIR foam core and reflective aluminium foil facings. It delivers outstanding thermal performance and moisture resistance, making it suitable for various installations and an ideal choice for different energy-efficient projects.
POA Get a quote -
75mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 4 (11.52m2)
All three models 75mm Kingspan Therma PIR Insulation Board:
- 75mm Thermapitch TP10
- 75mm Thermafloor TF70
- 75mm Thermawall TW55
share the same high-performance PIR core and low-emissivity foil facings, offering excellent thermal efficiency and easy installation. Although labeled differently, these boards share identical technical specifications.
£189.94£227.93 Ex VATInc VAT£16.49£19.79 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.
£31.89£38.27 Ex VATInc VAT£11.07£13.28 Per M2 Add to cart