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.

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 options


Availability Indicators

Kingspan Kooltherm K5 is sent out from depots nationwide and is subject to the Local Depot Delivery minimum order levels and delivery charge thresholds.

Limited stock of the most popular boards sizes may be held at some of our larger depots, and thus, available on shorter lead times than the availability rating suggests.

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 may vary.

  • Generally 1 to 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

Delivery charges will be calculated at check-out. Please visit our Ordering From Us page for further details on minimum order levels and delivery charges. If you have any queries, please do not hesitate to contact me via our Contact Form or on 01903 899 898.

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

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

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

Product Properties

Thickness25mm to 100mm

Product Performance

Thermal Conductivity0.022 W/mK (insulant thickness 25 – 44 mm)
0.021 W/mK (insulant thickness ≥ 45 mm)
Compressive Strength120 kPa at 10% compressionBS EN 826:2013
Vapour Resistance> 300 MNs/gmBS EN 12086: 1997 / I.S. EN 12086: 1998
Nominal Density39 kg/m³ 

Product Variants

ProductThicknessThermal Resistancekg/m²
Kingspan Kooltherm K5 25mm25mm1.20 m²K/W1.20 kg/m²
Kingspan Kooltherm K5 30mm30mm1.35 m²K/W1.36 kg/m²
Kingspan Kooltherm K5 40mm40mm1.80 m²K/W1.71 kg/m²
Kingspan Kooltherm K5 50mm50mm2.35 m²K/W2.06 kg/m²
Kingspan Kooltherm K5 55mm55mm2.60 m²K/W2.41 kg/m²
Kingspan Kooltherm K5 60mm60mm2.85 m²K/W2.76 kg/m²
Kingspan Kooltherm K5 80mm80mm3.80 m²K/W3.11 kg/m²
Kingspan Kooltherm K5 90mm90mm4.25 m²K/W3.46 kg/m²
Kingspan Kooltherm K5 100mm100mm4.75 m²K/W3.81 kg/m²

While we have provided Thermal Resistance values for all thicknesses on the Kingspan Kooltherm K5 datasheet, some thicknesses may not be readily available.