Kingspan Thermawall TW55 20mm PIR Board

20mm Thermawall TW55 delivers high-performance thermal insulation for timber frame and steel frame wall applications. Featuring a thermal conductivity of 0.022 W/mK, this board provides excellent insulation efficiency. The boards are straightforward to cut and fit, ensuring quick and hassle-free installation. Multiple thickness options are available to suit your specific insulation needs.

This product stands out as one of the most thermally efficient cavity wall insulation solutions on the market. It works effectively with both timber and steel frame construction, and can be positioned between studs or used as external sheathing. This versatility makes it particularly suited to Modern Methods of Construction (MMC).

Properties

Brand: Kingspan

Thickness: 20mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 100 mm.

Model: 20mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 20mm

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: 0.9m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 20mm 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, 20mm 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 20mm insulation board suits multiple installation methods. Use it as external sheathing on timber or steel frame structures, between studs in timber frame walls, beneath external masonry with timber frame backing, or behind ventilated cladding systems on timber frames.

Facing Details

During manufacture, Kingspan 20mm PIR receives a low emissivity composite foil bonded to both surfaces. This reflective layer boosts thermal resistance in unventilated cavities adjacent to the board.

Core Composition

The 20mm Kingspan Thermawall TW55 core utilises Nilflam® technology, a premium fibre-free rigid thermoset polyisocyanurate (PIR) material. Production employs a zero Ozone Depletion Potential (ODP) blowing agent with minimal Global Warming Potential (GWP).

Compressive Strength

When tested to BS EN 826:2013 (Thermal insulating products for building applications. Determination of compression behavior), 20mm Kingspan PIR insulation typically achieves compressive strength exceeding 140 kPa at 10% compression.

Water Vapour Resistance

Testing to BS EN 12086:2013 (Thermal insulating products for building applications. Determination of water vapor transmission properties) demonstrates the product typically attains resistance well above 100 MNs/g.

Durability

The lifespan of 20mm TW55 depends on correct installation, adequate structural support, and appropriate usage conditions. When properly installed, the product can deliver an indefinite service life.

Fire Performance

20mm Kingspan Insulation TW55 achieves an F Euroclass rating under System 4 AVCP. In pitched roof applications with suitable roof covering, it meets national requirements for external fire exposure.

Info

Browse our full Kingspan range and filter by thickness or coverage on the left side of the page. For advice on product suitability for your project or to request a quantity discount quotation, contact us by phone on +4402038839057, email sales@insulationbee or use Live Chat - Lowest UK Insulation Prices.