A 72.5mm insulation board is specified when a building needs a noticeable improvement in thermal performance, but there is a limit on the amount of internal space that can be sacrificed.
It is most commonly supplied as an insulated plasterboard system, where insulation and a finished lining are bonded together as a single solid panel.
What is 72.5mm thick insulation board?
A 72.5mm thick insulation board is a panel that combines a rigid insulating core and a plasterboard finish to save time on site. Separate insulation and lining layers are not required since it is factory-made with the board bonded straight to insulation.
In most products, the foam core is rigid PIR (polyisocyanurate) insulation with a thermal conductivity of around 0.022 W/m.K, and the plasterboard layer is about 12.5mm thick. Others use a phenolic core as the insulating material. This means the board provides good resistance to heat transfer.
It is relatively lightweight and easy to handle on site, and can be fixed with dry-lining adhesive or mechanical fixings.
What is 72.5mm insulation thickness board used for?
An insulation 72.5mm board is mainly used where you want good insulation without building up lots of separate layers. It is typically used in:
Internal face of external solid walls to improve thermal performance
Drylining and insulating timber frame walls
Below rafters in pitched roofs (as an internal lining system)
Stud partitions where improved thermal comfort and a finished lining are required
Because the insulation and plasterboard are combined, you cut down installation time and reduce the risk of gaps forming between insulation and lining layers that might let heat escape.
Types of 72.5mm insulation board
Two main types of 72.5mm insulated plasterboard are available:
– The most common type. Polyisocyanurate foam provides very good thermal performance per millimetre of thickness, making it efficient at reducing heat loss. These boards are rigid, light, and factory-bonded to plasterboard.
– A slightly higher-performance option where the core is phenolic foam. Phenolic can have a lower thermal conductivity and may offer improved fire performance depending on the specific product classification. An example is Kingspan Kooltherm K118, which is especially suited to wall and roof applications.
Both types can be used under rafters, on walls, and on ceilings to deliver insulation plus a finished plasterboard surface.
Benefits of insulation 72.5mm thickness board
Insulation 72.5mm boards offer several benefits:
Thermal efficiency – Lowers heat loss, making buildings more energy efficient.
Combined finish – Separate board layer after insulation is not needed.
Speed – Fixing what is effectively two products in one cuts labour time.
Easy to handle – Relatively light and easy to cut with standard tools.
Versatile – Can be used to line walls or below roof rafters in new builds and refurbishments.
Regulation-friendly – Can contribute towards meeting UK Part L requirements when correctly specified.
At Insulation Wholesale, you can purchase 72.5mm Insulation Board at low wholesale prices with fast delivery for most of items within 2-5 days. Competitive rates guaranteed.
FAQ
How much is 72.5mm insulation board?
Prices vary depending on brand, core material, quantity, and market conditions. Trade and pallet pricing typically offer a lower cost per board. Reach out to our team, and they will be happy to give you a precise quote.
Because we stock UK stock at low wholesale pricing, you will find trade discounts when buying pallets or large quantities.
How to cut 72.5mm insulation board?
Cutting a 72.5mm insulation thickness board is simple when carried out carefully.
Measure where to cut and mark the cut line on the board.
Firmly support boards with foil facings under the cut so they do not splinter.
Use a fine-toothed saw or sharp insulation knife.
Score the plasterboard face first, then cut through the insulation layer.
Bend the board gently where scored to snap it straight.
Wear goggles and a mask to shield yourself from dust.
Where to buy a 72.5mm insulation board?
You can buy a 72.5mm insulation board from Insulation Wholesale, where we stock a range of options, including PIR and phenolic core boards. Our team can help you pick the right type for your walls or roof. We have UK stock, so we can arrange fast nationwide delivery right to your site. We sell and supply direct, so you get competitive pricing and technical support from experienced insulation specialists.
60mm + 12.5mm Celotex PL4060 PIR Insulated Plasterboard is it is suitable for use in roof and internal wall lining applications. Celotex Insulated Plasterboard is a high performance, easy to install PIR insulation board with a paper facing, laminated to a piece of 12.5mm tapered edge plasterboard.
£66.42£79.70Ex VATInc VAT£23.06£27.67Per M2Add to cart
60mm + 12.5mm Kingspan Kooltherm K118 Insulated Plasterboard is a premium performance insulation with a fibre-free rigid thermoset phenolic core. It is an insulated plasterboard for mechanically fixed and adhesively bonded insulated dry-lining th a thermal conductivity of just 0.019 W/mK across all thicknesses.
£980.44£1,176.53Ex VATInc VAT£30.95£37.14Per M2Add to cart
Mannok Therm Laminate-Kraft / MLK PIR 60mm + 12.5mm PIR Insulated plasterboard is a high performance, fibre-free insulated board. Mannok Therm Laminate-Kraft / MLK PIR has a kraft paper facing on one side and plasterboard bonded to the other side.
72.5mm Unilin Safe-R SR/TB is a high-performance insulation that offers excellent thermal efficiency. Its design ensures quick and secure installation, delivering long-term energy savings and safety compliance.
72.5mm Unilin Safe-R SR/TB-MF Mech Fix Insulated Plasterboard is designed for mechanical fixing, it offers excellent thermal efficiency, easy installation and ready-to-finish surface for walls and ceilings.
