-
40mm Celotex TB4040 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
40mm Celotex TB4040 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.
£21.28£25.54 Ex VATInc VAT£7.39£8.87 Per M2 Add to cart -
40mm Ecotherm Eco-Versal PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
40mm 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.
£21.21£25.45 Ex VATInc VAT£7.36£8.83 Per M2 Add to cart -
40mm Jablite HP+ 70E External Wall Insulation Board 1200mm x 600mm (4′ X 2′) Pack of 15 (10.80m2)
40mm 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.
£54.58£65.50 Ex VATInc VAT£5.05£6.06 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
£65.35£78.42 Ex VATInc VAT£8.71£10.45 Per M2 Add to cart -
40mm Kingspan Kooltherm K103 Insulation Floorboard 2400mm x1200mm Pack of 8 (23.04m2)
40mm Kooltherm K103 is a premium phenolic core floor insulation solution, designed to deliver exceptional performance with solid concrete or suspended timber floors.
£385.51£462.61 Ex VATInc VAT£16.73£20.08 Per M2 Add to cart -
40mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2
40mm 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.
£20.29£24.35 Ex VATInc VAT£7.05£8.46 Per M2 Add to cart
40mm Insulation Board
The 40mm insulation board is a rigid insulation board used to reduce heat loss through elements of the building fabric. It is usually specified where space is limited, but additional thermal resistance is required.
40mm insulation boards deliver a notable improvement in warmth without altering the main structure of the wall, floor, or roof.
What is 40mm insulation thickness board?
The 40mm thick insulation board is manufactured to a thickness of 40mm, which is enough to reduce heat flow meaningfully. Insulation works by slowing heat transfer by trapping still air or limiting thermal conduction.
A 40mm insulation board thickness provides greater thermal resistance than thinner lining boards. But it is not intended to replace full-depth insulation systems required for regulatory compliance.
What is 40mm thick insulation board used for?
A thick 40mm insulation board is typically used where control of build-up depth is critical:
- Internal wall linings where internal space loss must be minimised.
- Stud walls to improve comfort and reduce cold surface temperatures.
- Floors where height build-up must be kept tight, and the board is rated for the expected loads.
- Junctions, reveals, and service zones to reduce localised thermal bridging.
It is rarely used on its own in roofs, floors, or external walls. Instead, it usually supports thicker insulation elsewhere in the build-up.
Types of insulation 40mm thick board
Different materials are available at this thickness, including:
EPS Insulation (expanded polystyrene)
EPS is a lightweight foam made by fusing expanded beads. Between these beads is trapped air, which slows heat transfer. EPS is easy to handle and cut, and at 40mm, it is often used in walls or backing layers where structural loads are low, and the EPS grade is suitable. It can also be used in floors where an appropriate EPS grade is specified.
XPS insulation (extruded polystyrene)
XPS is strong under load and highly resistant to moisture. It is mainly fitted on floors and in areas exposed to damp conditions.
Phenolic Insulation foam
Phenolic boards deliver very high thermal performance for their depth. At 40mm, they can achieve comparable U-values to thicker layers of lower-performance materials. They are installed where space is severely limited, and performance targets are demanding.
PIR Insulation (polyisocyanurate)
PIR insulating boards are manufactured with a rigid polyisocyanurate foam core faced with aluminium foil. They are commonly specified in walls, floors, and roofs, as they offer solid thermal resistance in a manageable panel format.
Kingspan Optim-R VIP (vacuum insulated panel)
VIPs contain a sealed core with most of the air removed. This gives extremely low heat transfer for the thickness. A 40mm VIP offers very high performance but must be supplied in the exact dimensions required and handled carefully, as cutting or puncturing the panel irreversibly degrades its thermal performance.
FAQ
Where to buy a 40mm insulation board?
You can buy insulation 40mm thickness boards online from Insulation Wholesale. We stock EPS, XPS, PIR, phenolic, and specialist options like VIP. We offer competitive pricing, a fast quote service, and nationwide delivery with reliable lead times.
How to fix 40mm insulation board?
For walls, 40mm insulation boards are usually secured with adhesive or mechanical fixings, or a combination of both. Fixings must be compatible with the substrate and long enough to hold through the insulation.
For floors, lay the insulation boards flat on a suitable base, with joints tight and supported. Confirm compressive strength and load-bearing suitability before installation.
Follow the manufacturer’s fixing guidance for the specific product used.
How to cut 40mm insulation board?
- Measure the space carefully.
- Mark the cut line.
- Use a sharp insulation knife or fine-tooth saw.
- Cut against a straight edge for accuracy.
VIP boards must not be cut on site and should always be ordered to size.
