Kingspan Insulation Kooltherm K5 phenolic external wall board Celotex Insulation

Kingspan Kooltherm K5

High performance rigid Phenolic external wall insulation board.

Suitable for use behind traditional and lightweight polymer modified renders.

Unaffected by air infiltration. Resistant to the passage of water vapour.

Easy to handle and install; ideal for new build and refurbishment projects.

Faced on both sides with a glass tissue based facing, autohesively bonded to the insulation core during manufacture.

Zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).

Thicknesses and Availability:

Available in most popular thicknesses from the manufacturer; short lead-times apply as we may need to get the products in from Kingspan before delivering to site.

This Kooltherm Range includes the following readily available product thicknesses: 50mm, 60mm and 70mm.

The following thicknesses are manufactured to order and may have minimum order requirements: 25mm, 30mm, 40mm, 80mm, 90mm, and 100mm.

Product Information

General information about Kingspan Kooltherm K5

Product Application

External wall insulating board for render systems

Kingspans high performance phenolic foam board, Kooltherm K5, is suitable for use in external wall applications with render systems.

Product Make-up


Kingspan Kooltherm K5 External Wall Board is a high performance rigid thermoset modified resin insulant.


Faced on both sides with a glass tissue based facing, autohesively bonded to the insulation core during manufacture.

Product Properties

Thickness 25mm to 100mm
Board Length 1.2m
Board Width 0.6m
Board Edge Square

Product Prices

Buy Kingspan Kooltherm K5

Product ex-VAT inc-VAT
Kingspan Kooltherm K5 50mm, 10 x 0.6x1.2m = 7.2m² £131.84 £158.20
Kingspan Kooltherm K5 60mm, 8 x 0.6x1.2m = 5.76m² £128.96 £154.75
Kingspan Kooltherm K5 70mm, 6 x 0.6x1.2m = 4.32m² £112.47 £134.96

Limited stock of the most popular boards sizes may be held at some of our larger depots.

Where products need to be brought in from Kingspan, please allow approx. 1 week for delivery on stocked items and up to 3 weeks on made to order thicknesses. While Kingspan keep the majority of the popular thicknesses in stock, less popular thicknesses may carry a minimum order level.

Kingspan reserves the right to change stocked products - while we will do all we can to keep on top of changes, availability and lead times my vary.

  • Generally 1 or 3 working days for delivery
  • Generally 1 to 5 working days for delivery
  • Generally 5 to 10 working days for delivery
  • Special request or made to order item, allow extended lead times. Minimum order levels may apply.
  • Please call to check availability and approximate lead times

Product availability depends upon stock levels at closest depot and delivery logistics to geographic locations

Product Performance and Guides

Product Performance, Manufacturer Downloads, and Installation Guides

Product Performance

Thermal Conductivity 0.022 W/mK (insulant thickness 25 – 44 mm)
0.021 W/mK (insulant thickness ≥ 45 mm)
Compressive Strength 120 kPa at 10% compression BS EN 826:2013
Vapour Resistance > 300 MNs/gm BS EN 12086: 1997 / I.S. EN 12086: 1998
Nominal Density 39 kg/m³
Product Thickness Thermal Resistance kg/m²
Kooltherm K5 30mm 30mm 1.40 m²K/W 1.34 kg/m²
Kooltherm K5 40mm 40mm 1.80 m²K/W 1.74 kg/m²
Kooltherm K5 50mm 50mm 2.35 m²K/W 2.14 kg/m²
Kooltherm K5 60mm 60mm 2.85 m²K/W 2.54 kg/m²
Kooltherm K5 70mm 70mm 3.30 m²K/W 2.94 kg/m²
Kooltherm K5 100mm 100mm 4.75 m²K/W 4.14 kg/m²

Product Certificates

Please visit the Kingspan website for product certificates.