Kingspan Thermawall TW55 70mm PIR Wall Insulation

70mm Thermawall TW55 provides high-performance thermal insulation for timber frame and steel frame wall systems. Featuring a thermal conductivity of 0.022 W/mK, this product delivers superior insulation efficiency. The 70mm boards are straightforward to cut and fit, ensuring quick and hassle-free installation. Available in multiple thicknesses to suit various insulation specifications.

Key benefits include excellent thermal efficiency for cavity wall insulation applications, compatibility with both timber and steel frame constructions, 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: 70mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 70 mm.

Model: 70mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 70mm

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: 3.15m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 70mm 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, 70mm 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 70mm insulation product works effectively in multiple installation scenarios. Use it as external sheathing on timber or steel frame walls, fit it between studs in timber frame construction, combine it with external masonry over timber frames, or install it beneath ventilated cladding systems on timber frames.

The Facings

During manufacturing, Kingspan 70mm 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

The core of 70mm Kingspan Thermawall TW55 utilises Nilflam® technology, delivering 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

When tested to BS EN 826:2013 (Thermal insulating products for building applications. Determination of compression behavior), 70mm Kingspan PIR insulation typically achieves compressive strength exceeding 140 kPa at 10% compression.

Water vapour resistance

Testing in accordance with BS EN 12086:2013 (Thermal insulating products for building applications. Determination of water vapor transmission properties) demonstrates that this product typically achieves resistance well above 100 MNs/g.

Durability

Product longevity depends on correct installation, adequate structural support, and appropriate usage conditions. When properly installed, it can deliver an indefinite service life.

Fire performance

70mm Kingspan Insulation TW55 achieves an F Euroclass rating under System 4 AVCP. When installed in pitched roof applications beneath appropriate roof coverings, it meets national requirements for external fire exposure.

Info

Browse our full Kingspan range and refine by thickness or coverage using the left-hand filters. For guidance on product suitability for your project or to request a bulk discount quotation, contact us by phone on +4402038839057, email sales@insulationbee or use Live Chat - Lowest UK Insulation Prices.