Kingspan Thermawall TW55 90mm PIR Board

90mm Thermawall TW55 provides high-performance thermal insulation for timber frame and steel frame walls. This PIR board achieves excellent thermal efficiency with a conductivity rating of 0.022 W/mK. The boards are straightforward to cut and fit, ensuring a quick and efficient 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 options, compatible with both timber and steel frame construction. It can be positioned between studs or used as external insulating sheathing, making it particularly suitable for Modern Methods of Construction (MMC).

Properties

Brand: Kingspan

Thickness: 90mm

Length: 2400mm

Width: 1200mm

Weight: 1.84kg | TW55 has an approximate weight of 3.50 kg/m2 at a thickness of 90 mm.

Model: 90mm Thermapitch TW55

Dimensions: 2,400mm x 1,200mm x 90mm

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: 4.05m2K/W

Size: 1200mm x 2400mm

Thermal Conductivity: 0.022 W/mk

Finish: 90mm 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, 90mm 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 90mm insulation board suits multiple installation methods, including use as external sheathing on timber or steel frames, placement between studs in timber frame walls, application to external masonry with timber frame backing, and installation beneath ventilated cladding systems on timber frames.

Facing Details

The manufacturing process bonds a low emissivity composite foil to both surfaces of Kingspan 90mm PIR, creating a reflective layer that boosts thermal resistance in unventilated cavities adjacent to the board.

Core Construction

90mm Kingspan Thermawall TW55 utilises Nilflam® technology, delivering a fibre-free rigid thermoset polyisocyanurate (PIR) core. The manufacturing employs a blowing agent with zero Ozone Depletion Potential (ODP) and minimal Global Warming Potential (GWP).

Compression Performance

When tested to BS EN 826:2013 (Thermal insulating products for building applications. Determination of compression behavior), 90mm Kingspan PIR insulation typically achieves compressive strength exceeding 140 kPa at 10% compression.

Water Vapour Resistance

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

Lifespan

The durability of 90mm TW55 depends on correct installation, adequate structural support, and appropriate usage conditions. When properly installed, the product can deliver an indefinite service life.

Fire Rating

90mm Kingspan Insulation 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

Browse our full Kingspan range and filter by thickness or coverage using the left-hand side options. For product suitability advice or bulk quotations, contact us by phone on +4402038839057, email sales@insulationbee, or use our Live Chat service for the best UK insulation prices.