What is internal wall insulation?

Internal wall insulation is the material used to add a thermal layer to solid-walled homes. It is especially useful for older solid wall houses and is commonly available as PIR boards, EPS panels, and mineral wool.

How much does internal wall insulation cost?

The total cost depends on material choice and project size. Prices are usually calculated per square metre for both boards and rolls. They can start as low as £2-£3 and climb to £49 or more per m². These prices typically refer to supply only; installation costs are additional.

How thick should internal wall insulation be?

Thickness varies depending on the material and available space. Thicker insulation provides better thermal resistance, but consider whether you have enough space for it. For optimal performance, a thickness range of 50 - 100mm applies to PIR boards. EPS boards require 75 - 100mm, while mineral wool slabs and rolls require 100 - 150mm. Consider getting a recommendation for optimal insulation thickness from a qualified installer. Thicker insulation improves U-values by reducing heat loss through the wall.

How to fit internal wall insulation?

You can fit insulation on interior walls using two methods. In both, the walls should be clean and dry before adding the insulant. Direct Fix: This is where you attach the boards directly to the wall and add a finish of your liking. Batten and Frame: Here, you fix timber or metal studs to the wall, insert the insulation slab or roll, then cover with plasterboard. Improper installation can lead to interstitial condensation; always use a vapour control layer where required. If unsure of doing a perfect installation, consult a qualified installer to avoid condensation or cold bridging issues.

Internal Wall Insulation At Low Wholesale Prices

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Products in Internal Wall Insulation

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125mm Mannok PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

125mm Mannok PIR Insulation Board is an excellent choice for anyone looking for a high-performance insulation solution that provides superior thermal efficiency. It is ideal for use in any construction project, such as commercial and residential, in wall applications as well as roofing and flooring applications.

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100mm Kingspan Kooltherm K112 Framing Insulation Board 2400mm x 1200mm Pack of 3 (8.64m2)

100mm 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.

£409.38£491.26 Ex VATInc VAT
£47.38£56.86 Per M2 Get restock alert
100mm ODE Acoustic Roll Insulation 7.8m2 Roll

100mm ODE Insulation Acoustic Roll is designed to reduce sound transmission, making it an ideal solution for creating quieter indoor environments. Its flexible and simple-to-install design effectively absorbs sound, making it perfect for both residential and commercial spaces.

£27.71£33.25 Ex VATInc VAT
£3.55£4.26 Per m2 Get restock alert
100mm Superglass Acoustic Roll 12 Insulation 12.12m2 Roll

Acoustic Roll 12 is a lightweight, non-combustible glass mineral wool insulation roll. The product is designed to provide thermal and acoustic insulation for several applications, including internal floors and partitions. Manufactured at a minimum density of 12kg/m3.

£45.98£55.18 Ex VATInc VAT
£4.03£4.84 Per m2 Get restock alert
130mm Recticel Eurothane GP PIR Insulation Board 2400mm x 1200mm (8′ x 4′) 2.88m2

130mm 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.

£53.70£64.44 Ex VATInc VAT
£18.65£22.38 Per M2 Get restock alert
140mm Superglass Cladding Mat 40 Thermal & Acoustic Roll 8.40m2

140mm Superglass Cladding Mat 40 is a resilient, medium dense and non-combustible glass mineral wool insulation roll with exceptional durability and high tear strength. The roll is supplied 1200mm wide to allow quick installation and minimum on-site cutting and waste.

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20mm Kingspan Therma TP10 / TF70 / TW55 PIR Insulation Board 2400mm x 1200mm (8′ x 4′) Pack of 15 (43.20m2)
All three models 20mm Kingspan Therma PIR Insulation Board:
- 20mm Thermapitch TP10
- 20mm Thermafloor TF70
- 20mm 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.

No longer in production.
£319.28£383.14 Ex VATInc VAT
£7.39£8.87 Per M2 Get restock alert
60mm Superglass Multi Acoustic Roll Insulation 13.50m2 Roll

60mm Superglass Acoustic Partition Roll (APR) is a lightweight, non-combustible glass mineral wool insulation roll. It is suitable for the following applications: internal walls and floors, timber and metal stud partitions, drylining systems and separating walls and floors. Manufactured at a minimum density of 10kg/m³.

£29.41£35.29 Ex VATInc VAT
£2.18£2.62 Per m2 Get restock alert
80mm Superglass Multi Acoustic Roll Insulation 12.48m2 Roll

80mm Superglass Acoustic Partition Roll (APR) is a lightweight, non-combustible glass mineral wool insulation roll. It is suitable for the following applications: internal walls and floors, timber and metal stud partitions, drylining systems and separating walls and floors. Manufactured at a minimum density of 10kg/m³.

£40.35£48.42 Ex VATInc VAT
£3.23£3.88 Per m2 Get restock alert
82.5mm Recticel Eurothane PL Insulated Plasterboard 2400mm x 1200mm (8′ x 4′) 2.88m2

82.5mm Recticel Eurothane PL pairs high-performance insulation with plasterboard, making homes warmer with a sleek, easy-fit design.

£77.36£92.83 Ex VATInc VAT
£26.86£32.23 Per M2 Get restock alert
90mm Superglass Cladding Mat 40 Thermal & Acoustic Roll 12.78m2

90mm Superglass Cladding Mat 40 is a resilient, medium dense and non-combustible glass mineral wool insulation roll with exceptional durability and high tear strength. The roll is supplied 1200mm wide to allow quick installation and minimum on-site cutting and waste.

£41.20£49.44 Ex VATInc VAT
£3.22£3.86 Per m2 Get restock alert
92.5mm Recticel Eurothane PL Insulated Plasterboard 2400mm x 1200mm (8′ x 4′) 2.88m2

92.5mm Recticel Eurothane PL pairs high-performance insulation with plasterboard, making homes warmer with a sleek, easy-fit design.

£87.61£105.13 Ex VATInc VAT
£30.42£36.50 Per M2 Get restock alert