Kingspan Thermawall TW55 75mm PIR Board

75mm 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 offers superior energy efficiency. The boards are lightweight and straightforward to cut, making installation quick and efficient. Available in multiple thicknesses to suit different insulation needs.

Key benefits include excellent thermal efficiency for cavity wall insulation applications, compatibility with both timber and steel frame systems, and versatility as either inter-stud insulation or external sheathing. This makes it particularly suitable for Modern Methods of Construction (MMC).

Properties

Brand: Kingspan

Thickness: 75mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 75 mm.

Model: 75mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 75mm

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: 3.40m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 75mm 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, 75mm 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

This 75mm insulation board can be deployed in several ways: as external sheathing on timber or steel frames, between studs in timber frame walls, beneath external masonry with timber frame backing, or as part of ventilated cladding systems. Its versatility makes it suitable for a range of construction methods and wall configurations.

Facing Details

The boards feature a low emissivity composite foil bonded to both surfaces during manufacturing. This reflective facing enhances thermal resistance in unventilated cavities adjacent to the board.

Core Composition

The 75mm Kingspan Thermawall TW55 core uses Nilflam® technology, delivering a fibre-free rigid thermoset polyisocyanurate (PIR) material. Manufacturing employs a zero Ozone Depletion Potential (ODP) blowing agent with minimal Global Warming Potential (GWP).

Compressive Strength

When tested to BS EN 826:2013 standards, 75mm Kingspan PIR insulation typically achieves compressive strength exceeding 140 kPa at 10% compression.

Water Vapour Resistance

Tested in accordance with BS EN 12086:2013, the product typically demonstrates water vapour resistance well above 100 MNs/g.

Durability

The lifespan of 75mm TW55 depends on correct installation, adequate structural support, and appropriate usage conditions. When properly installed, the product can offer an extended service life.

Fire Performance

75mm Kingspan Insulation TW55 achieves an F Euroclass rating under System 4 AVCP. When used in pitched roof applications with suitable roof coverings, it meets national external fire exposure requirements.

Info

Browse our full Kingspan range and filter by thickness or coverage using the options on the left. For project-specific advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat for the best UK insulation prices.