Kooltherm K8 Cavity Board


Premium performance partial fill cavity wall insulation

Kingspan Kooltherm K8 is a premium performance rigid thermoset phenolic insulation board used in partial fill cavity walls, it is particularly suited for new build projects. Manufactured in Castleblayney with a composite tissue facing the board allows for a clear cavity to resist moisture penetration.

Kingspan Kooltherm K8 cavity board is manufactured without the use of CFCs/HCFCs and has zero Ozone Depleting Potential (ODP) and low Global Warming Potential (GWP).  The board meets MHBC technical requirements when used with a 50mm residual cavity.
  • Negligible smoke obscuration
  • Unaffected by air infiltration
  • Resistant to the passage of water vapour
  • Easy to handle  and install
  • Ideal for new build and refurbishment

Product brochure

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

Kooltherm K8 Cavity Board Brochure

Product information

Product details
Product Literature


Thermal conductivity (insulant thickness) 0.021 W/m.K ( 25–44 mm)
0.020 W/m.K ( ≥ 45 mm)
Compressive strength at 10% compression 120 kPa
Facings Composite foil
Core Premium performance rigid thermoset modified resin 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 m

Case Studies

Convention Centre Dublin Night

Aerospace Firm RLC

Kingspan Insulation are providing a number of products for this new and exciting project. We worked closely with the Architect Tate Stevenson to provide the right Insulation to meet the demands of this new facility.

Aviva Stadium Night far away

Aviva Stadium

As Ireland’s first and only, UEFA Elite Stadium, the 50,000 capacity venue is one of the most modern purpose built structures in the country. In total, nine Kingspan Insulation technologies were employed in the build of the new Aviva Stadium, including Kingspan Kooltherm K7 in the ceiling, a premium performance rigid thermoset insulation with thermal conductivities as low as 0.020 W/m.K.

QUB Experimental Centre

QUB Centre for Experimental Medicine

The Queens University Belfast Centre for Experimental Medicine is an interdisciplinary research centre housed in The Wellcome-Wolfson Institute for Experimental Medicine.

Daisy Lodge

Daisy Lodge

Daisy Lodge is a custom built short break centre, the £3 million project is the first of its kind in Europe built for the Northern Ireland Cancer Fund for Children.

Knockevin school

Knockevin School

Knockevin school is an educational school situated in the Downpatrick area that caters for pupils under the age of 19 with severe and profound learning difficulties.

Convention Centre Dublin Night

Derry House

Designed by Tracey Architects, this property located in Derry is a very impressive energy efficient structure. Constructed by the Kevin Watson Group, this project used a range of Kingspan products and availed of Kingspan Insulations new Premium Plus Service.

Convention Centre Dublin Night

Omagh Fire Station

Construction on the new Omagh Community Fire Station and District Offices on the Killybrack Road, Omagh was completed in May 2014; the official opening took place four months later in September.

Vizes Court

Vizes Court

Completed in January 2014 as part of Limerick City’s Regeneration Scheme, Vizes Court is a purpose built residential complex specifically designed for elderly occupants. Located in the heart of Limerick city centre, the €4.5m development spread over 3 stories has 29 individually accessed apartments and a central communal area.

Do you need help or advice on a project?

Contact our experienced technical services department today.

Get in touch

Kingspan Insulation Ltd.

Bree Industrial Estate


Co. Monaghan

A75 X966

Tel: +353 (0) 42 979 5000