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70mm Celotex GA4070 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
70mm Celotex GA4070 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.
£33.53£40.24 Ex VATInc VAT£11.64£13.97 Per M2 Add to cart -
70mm Ecotherm Eco-Versal PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
70mm 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.
£33.59£40.31 Ex VATInc VAT£11.66£13.99 Per M2 Add to cart -
70mm Jablite HP+ 70E External Wall Insulation Board 1200mm x 600mm (4′ X 2′) Pack of 8 (5.76m2)
70mm 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.
£51.08£61.30 Ex VATInc VAT£8.87£10.64 Per M2 Add to cart -
70mm Kingspan Kooltherm K103 Insulation Floorboard 2400mm x1200mm Pack of 4 (11.52m2)
70mm Kooltherm K103 is a premium phenolic core floor insulation solution, designed to deliver exceptional performance with solid concrete or suspended timber floors.
£316.14£379.37 Ex VATInc VAT£27.44£32.93 Per M2 Add to cart -
70mm Kingspan Kooltherm K107 Pitched Roof Board 2400mm x 1200mm Pack of 4 (11.52m2)
70mm 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.
£316.14£379.37 Ex VATInc VAT£27.44£32.93 Per M2 Add to cart -
70mm Kingspan Kooltherm K110 Soffit Board Insulation 2400mm x 1200mm Pack of 4 (11.52m2)
70mm Kingspan Kooltherm K110 Soffit Board Insulation enhances thermal performance in soffit areas with its slim, efficient design. It’s easy to install and improves energy efficiency.
£339.33£407.20 Ex VATInc VAT£29.46£35.35 Per M2 Add to cart -
70mm Kingspan Kooltherm K112 Framing Insulation Board 2400mm x 1200mm Pack of 4 (11.52m2)
70mm 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.
£395.96£475.15 Ex VATInc VAT£34.37£41.24 Per M2 Add to cart -
70mm Kingspan Kooltherm K5 External Wall Insulation Board 1200mm x 600mm Pack of 6 (4.32m2)
70mm Kingspan Kooltherm K5 External Wall Board is a premium performance insulation with a fibre-free rigid thermoset phenolic core used as external insulation for masonry walls.
£122.09£146.51 Ex VATInc VAT£28.26£33.91 Per M2 Add to cart -
70mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
70mm 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.
£32.44£38.93 Ex VATInc VAT£11.26£13.51 Per M2 Add to cart
70mm Insulation Board
A 70mm insulation board is used when a building needs a significant increase in thermal performance, but space is limited.
At this thickness, the board provides a measurable reduction in heat transfer through walls, roofs, or floors.
What is 70mm thick insulation board?
A 70mm thick insulation board is a rigid slab designed to reduce heat transfer in a building through conduction and convection.
The “70mm” refers to its depth, which is thick enough to noticeably reduce heat loss while still fitting within common wall, floor, and roof build-ups used on site.
The board is dimensionally stable and can fit tightly against structural elements without slumping or compressing over time.
What is 70mm insulation thickness board used for?
70mm insulation thickness boards are used:
- In pitched roofs between and over rafters to reduce heat loss through the roof.
- Under floors or in floor screeds to reduce heat loss downwards.
- Inside cavity walls where cavity width allows or between studs, to boost wall thermal resistance.
- In ceilings or lofts to help keep upstairs rooms warm.
Because it is rigid, the board supports itself and sits flush with framing, helping contribute towards building energy performance requirements without adding too much bulk.
Types of 70mm insulation board
70mm insulation boards are available in the following material types:
PIR Insulation (Polyisocyanurate)
These are the most common. They have a rigid foam core with reflective foil facings that help trap heat. PIR boards give strong thermal performance for their thickness (around 0.022 W/m.K), allowing target U-values to be achieved with reduced build-up depth.
Phenolic Insulation Foam Board
Phenolic boards have a foam core that is made from phenolic resin. Their lambda value is around 0.021 W/m.K, with 70mm phenolic insulation boards delivering reliable performance where space is limited, and high thermal performance is required.
EPS Insulation (Expanded Polystyrene)
EPS is a bead-based foam that is easy to cut. It has higher conductivity (less insulating per millimetre) than PIR/phenolic, but it’s useful where cost matters and the performance requirements are lower. It is sometimes used beneath screeds and in external render systems.
Benefits of insulation 70mm thickness board
Using a 70mm rigid insulation board offers advantages like:
- Thermal efficiency – It resists heat flow well for its size, helping rooms stay warm with less energy.
- Slim build-ups – A 70mm insulation thickness board fits in common timber depths and tight spaces without needing larger structures.
- Rigid and neat – Boards cut cleanly, install flush with studs or joists, and reduce unwanted gaps that reduce thermal performance.
- Versatile – For many wall and roof build-ups, 70mm fits naturally within the structure without forced design changes.
- Long-lasting – Rigid 70mm materials do not sag or settle like soft insulation can over time.
FAQ
Where to buy a 70mm insulation board?
You can buy a 70mm insulation board online from Insulation Wholesale. We stock multiple board types (PIR, phenolic, EPS) in UK stock. Buying from us means you get competitive pricing, expert support, and a choice of quality brands in one place. We offer trade discounts, pallet deals, and fast quote options so you can plan costs, and we supply fast nationwide delivery straight to your site.
How to cut 70mm insulation board?
To cut insulation thick 70mm board:
- Mark where to cut.
- Use a sharp insulation knife, handsaw, or jigsaw.
- Keep the board supported and flat so it does not snap as you cut.
- Score the facing where applicable (PIR & phenolic), and then cut through the core.
Use safety gloves, goggles, and a dust mask to protect yourself from light dust.
How much is 70mm insulation board?
Prices vary depending on material, brand, quantity, and market conditions. Bulk orders and pallet deals typically reduce the cost per board.
PIR boards (like Celotex or Recticel) cost roughly around £20–£30 per board for standard sizes (2400 x 1200), with bulk orders often cheaper per board.
Premium phenolic boards or specialised products can cost more. Trade discounts and pallet deals from Insulation Wholesale reduce prices significantly when you order larger quantities.
What is the R-value of 70mm PIR?
The R-value of a 70mm PIR insulation board is typically 3.1–3.2 m²K/W – this is the thermal resistance. Phenolic boards have a slightly higher R-value because they deliver better insulation per millimetre.
