Kingspan Thermawall TW55 PIR Insulation Board 125mm

125mm Thermawall TW55 provides high-performance thermal insulation for timber frame and steel frame wall construction. Featuring a thermal conductivity of 0.022 W/mK, this product delivers superior insulation performance. The 125mm boards are straightforward to cut and position, enabling quick and efficient installation. Available in multiple thicknesses to suit different insulation needs.

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

Properties

Brand: Kingspan

Thickness: 125mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 125 mm.

Model: 125mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 125mm

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: 5.65 m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 125mm 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, 125mm 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 125mm insulation product suits numerous installation methods, including external sheathing on timber or steel frame structures, cavity filling between studs in timber frame walls, external masonry combined with timber frame, and ventilated cladding systems with timber frame construction.

Facing Details

During manufacturing, Kingspan 125mm PIR receives a low emissivity composite foil facing on both surfaces. This reflective layer enhances thermal resistance in unventilated cavities adjacent to the board.

Core Composition

The core of 125mm Kingspan Thermawall TW55 utilises Nilflam® technology, a premium fibre-free rigid thermoset polyisocyanurate (PIR) material. The manufacturing process employs a blowing agent with zero Ozone Depletion Potential (ODP) and minimal Global Warming Potential (GWP).

Compressive Strength

Testing to BS EN 826:2013 (Thermal insulating products for building applications. Determination of compression behavior) demonstrates that 125mm Kingspan PIR insulation typically achieves compressive strength exceeding 140 kPa at 10% compression.

Water Vapour Resistance

When tested in accordance with BS EN 12086:2013 (Thermal insulating products for building applications. Determination of water vapor transmission properties), the product typically attains a resistance well above 100 MNs/g.

Durability

The lifespan of 125mm TW55 depends on correct installation, adequate structural support, and appropriate usage conditions. When properly installed, the product can potentially offer an unlimited service life.

Fire Performance

125mm Kingspan Insulation TW55 achieves an F Euroclass rating under System 4 AVCP. In pitched roof applications with suitable roof covering, it meets national standards for external fire exposure.

Info

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