Image of Kingspan Thermawall TW50

High performance partial fill cavity wall insulation

Kingspan Thermawall TW50 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core.

It is used to insulate cavity walls, and has a thermal conductivity of 0.022 W/mK.

Product brochure

Our product brochures include U-value tables, handling advice and installation guidance.

Thermawall TW50

Technical & downloads

Thermal conductivity 0.022 W/mK
Euroclass F
Facings Low emissivity composite foil
Core High performance rigid thermoset polyisocyanurate (PIR) insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP)
Board size 1.2 x 0.45 metres
Weight Approx 3.30 kg/m2 at a thickness of 100 mm
There are potential restrictions placed upon this product which vary dependant on building type, height, construction and location. For guidance regarding the routes to compliance for meeting the fire safety requirements of the Building Regulations / Standards, refer to the relevant links to Government websites here.

Standard details

Our standard detail brochures provide clear details for wall junctions, including sills and jambs, that have been carefully developed with the aims of being buildable.

Thermawall TW50 (50 mm in 100 mm cavity) Standard Details

Thermawall TW50 (75 mm in 125 mm cavity) Standard Details


Net Zero Energy / Renewable Energy Kingspan Thermawall TW50 is manufactured in our Pembridge, Herefordshire and Selby, North Yorkshire facilities. By the end of 2020, 100% of the non-renewable operational energy used in manufacturing processes in this site will be matched through the use of renewable energy and the purchase of renewable energy certificates (to offset any remaining non-renewable energy use). Visit our Net Zero Energy area to learn more.
Net Zero Carbon manufacturing Our groupwide aim is to achieve net zero carbon (CO2e) emissions (scope 1 & 2) from our manufacturing activities by the end of 2030. For more info, visit Planet Passionate.
Waste to Landfill At Pembridge, we currently send 7.9% of our manufacturing waste to landfill. We are working to achieve total landfill diversion in the next year.
At Selby, we currently send 0% of our manufacturing waste to landfill.
Our Planet Passionate goal is to send zero waste to landfill by 2030.
Responsible sourcing This product is certified 'Excellent' to BES 6001 (Framework Standard for the Responsible Sourcing of Construction Products) for our Pembridge manufacturing site. 
Kingspan Thermawall TW50 is manufactured at two sites and offers the following sustainability performance.

Responsible sourcing

Kingspan Thermawall TW50 produced at Kingspan Insulation’s Pembridge, Herefordshire and Selby, North Yorkshire manufacturing facilities is certified to BES 6001 (Framework Standard for the Responsible Sourcing of Construction Products) ‘Excellent’.
Planet Passionate
Through our new Planet Passionate 10-year groupwide sustainability programme, we aim to make significant advances in the sustainability of our business and of our products.

Case studies

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