Kingspan Thermawall TW55 PIR Wall Insulation 50mm

50mm 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 board delivers excellent thermal resistance with minimal effort during installation. These 50mm insulation boards cut and fit easily, and come in multiple thicknesses to suit different project needs.

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

Properties

Brand: Kingspan

Thickness: 50mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 50 mm.

Model: 50mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 50mm

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: 2.25m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 50mm 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, 50mm 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 50mm insulation board suits multiple installation methods including external sheathing on timber or steel frames, inter-stud placement in timber frame walls, external masonry paired with timber frames, and ventilated cladding systems with timber frame construction.

Foil Facings

Both sides of Kingspan 50mm PIR feature a low emissivity composite foil bonded during manufacture. This reflective layer boosts thermal resistance in unventilated cavities adjacent to the board.

Core Material

The 50mm Kingspan Thermawall TW55 core uses Nilflam® technology, delivering a fibre-free rigid thermoset polyisocyanurate (PIR) insulation. Manufacturing employs a zero Ozone Depletion Potential (ODP) blowing agent with minimal Global Warming Potential (GWP).

Compressive Strength

Testing to BS EN 826:2013 (Thermal insulating products for building applications. Determination of compression behavior) shows 50mm Kingspan PIR insulation typically exceeds 140 kPa compressive strength at 10% compression.

Water Vapour Resistance

Under BS EN 12086:2013 (Thermal insulating products for building applications. Determination of water vapor transmission properties), this product achieves 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 provide a long service life.

Fire Performance

50mm Kingspan Thermawall TW55 achieves an F Euroclass rating under System 4 AVCP. In pitched roof applications with suitable roof covering, it meets national external fire exposure requirements.

Info

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