Kingspan Thermawall TW55 40mm PIR Wall Insulation Board

40mm Thermawall TW55 provides high-performance thermal insulation for timber frame and steel frame wall construction. Featuring a thermal conductivity of just 0.022 W/mK, this PIR insulation board delivers outstanding thermal resistance. The boards are lightweight and straightforward to cut, making installation quick and efficient. Available in multiple thicknesses to suit different project specifications.

This solution stands out as one of the most thermally efficient cavity wall insulation options, compatible with both timber and steel frame systems. It can be positioned between studs or applied as external sheathing, making it particularly suitable for Modern Methods of Construction (MMC).

Properties

Brand: Kingspan

Thickness: 40mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 40 mm.

Model: 40mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 40mm

Compressive Strength: The compressive strength typically exceeds 140 kPa at 10% compression.

Density: 32 Kg/m3

Length: 2400mm

Material: Polyisocyanurate (Kingspan PIR Insulation)

R-Value: 1.80m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 40mm TW55 is faced on both sides with a low emissivity composite foil, autohesively bonded to the insulation core during manufacture.

Applications: Insulation for timber and steel framing systems.

Fire Resistance: Under System 4 AVCP, 40mm Thermapitch TW55 has a Euroclass rating of F.

Water vapour resistance: 110 MNs/g

BBA Certified: Yes, No. 14/5133

Features: Improves the Thermal Resistance | Unaffected by air infiltration | Resistant to the passage of water vapour

Applications

The 40mm insulation board works effectively in multiple installation scenarios. Use it as external sheathing on timber or steel frame structures, position between wall studs in timber frame construction, combine with external masonry and timber frame systems, or install beneath ventilated cladding on timber frame walls.

The Facings

During manufacturing, Kingspan 40mm PIR receives a low emissivity composite foil facing on both surfaces. This reflective layer enhances thermal resistance in unventilated cavities adjacent to the board.

The Core

40mm Kingspan Thermawall TW55 utilises Nilflam® technology, delivering a premium fibre-free rigid thermoset polyisocyanurate (PIR) core. The manufacturing process employs a blowing agent with zero Ozone Depletion Potential (ODP) and minimal Global Warming Potential (GWP).

Compressive Strength

When tested to BS EN 826:2013 (Thermal insulating products for building applications. Determination of compression behavior), 40mm Kingspan PIR insulation typically achieves compressive strength exceeding 140 kPa at 10% compression.

Water vapour resistance

Following BS EN 12086:2013 (Thermal insulating products for building applications. Determination of water vapor transmission properties), this product typically demonstrates water vapour resistance well above 100 MNs/g.

Durability

The service life of 40mm TW55 depends on correct installation, adequate structural support, and appropriate usage conditions. When properly installed, the product can deliver an extended lifespan.

Fire performance

40mm Kingspan Insulation TW55 achieves an F Euroclass rating under System 4 AVCP. In pitched roof applications with suitable roof covering, it meets national external fire exposure requirements.

Info

Browse our full Kingspan range and filter by thickness or coverage using the left-hand menu. For project-specific advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee or use Live Chat - Lowest UK Insulation Prices.