Kingspan Thermawall TW55 25mm PIR Board

25mm Thermawall TW55 provides high-performance thermal insulation for timber frame and steel frame walls. Delivering a thermal conductivity of 0.022 W/mK, this solution ensures excellent energy efficiency. The 25mm insulation boards are straightforward to cut and position, enabling quick and efficient installation. Available in multiple thicknesses to suit different insulation specifications.

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

Properties

Brand: Kingspan

Thickness: 25mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 25 mm.

Model: 25mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 25mm

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: 1.10m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 25mm 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, 25mm 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 25mm insulation product suits multiple installation methods, including external sheathing on timber and steel frame structures, inter-stud placement in timber frame walls, external masonry combined with timber frame, and ventilated cladding systems with timber frame construction.

Facing Details

During manufacture, Kingspan 25mm PIR receives a low emissivity composite foil facing on both surfaces. This reflective layer enhances thermal resistance within unventilated cavities adjacent to the board.

Core Construction

The core of 25mm Kingspan Thermawall TW55 utilises Nilflam® technology, a premium fibre-free rigid thermoset polyisocyanurate (PIR) material. Manufacturing 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), 25mm Kingspan PIR insulation typically achieves compressive strength exceeding 140 kPa at 10% compression.

Water Vapour Resistance

Following BS EN 12086:2013 testing (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

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

Fire Performance

25mm Kingspan Insulation TW55 achieves an F Euroclass rating under System 4 AVCP. When installed in pitched roof applications beneath appropriate roof coverings, it satisfies national requirements for external fire exposure.

Information

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