Kingspan Kooltherm K108


Premium performance rigid Phenolic partial-fill cavity wall insulation board

Replaced Kingspan Kooltherm K8.

New lower Lambda Value (Thermal Conductivity) 0.019 W/mK… The most thermally efficient commonly used insulating board.

Low emissivity foil facings significantly increase the thermal performance of the cavity.

Boards are designed to fit easily with standard brick and block dimensions allow the insertion of wall ties at appropriate spacing.

Premium performance rigid thermoset fibre-free phenolic insulant.

Unaffected by air infiltration. Resists moisture penetration by allowing a clear cavity to be maintained.

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, 75mm and 100mm.

The following thicknesses are manufactured to order and may have minimum order requirements: 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 70mm, 80mm, 90mm, 110mm, 120mm, 130mm, 140mm and 150mm.

Product options


Availability Indicators

Kingspan Kooltherm K108 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

Partial-fill cavity wall insulating board

Kingspans premium performance lower-lambda value phenolic foam board, Kooltherm K108, is suitable for use in partial-fill cavity wall applications.

Product Make-up

Core: Kingspan Kooltherm K108 Cavity Board is a premium performance rigid thermoset fibre-free phenolic insulant manufactured.

Facings: Faced on both sides with a low emissivity composite foil, autohesively bonded to the insulation core during manufacture.

Product Properties

Thickness50mm to 100mm

Product Performance

Thermal Conductivity0.019 W/mK 
Compressive Strength120 kPa at 10% compressionBS EN 826:2013
Nominal Density35 kg/m³ 

Product Variants

ProductThicknessThermal Resistancekg/m²
Kingspan Kooltherm K108 40mm40mm2.10 m²K/W1.76 kg/m²
Kingspan Kooltherm K108 50mm50mm2.60 m²K/W2.11 kg/m²
Kingspan Kooltherm K108 60mm60mm3.15 m²K/W2.46 kg/m²
Kingspan Kooltherm K108 70mm70mm3.65 m²K/W2.81 kg/m²
Kingspan Kooltherm K108 75mm75mm3.90 m²K/W2.99 kg/m²
Kingspan Kooltherm K108 80mm80mm4.20 m²K/W3.16 kg/m²
Kingspan Kooltherm K108 90mm90mm4.70 m²K/W3.51 kg/m²
Kingspan Kooltherm K108 100mm100mm5.25 m²K/W3.86 kg/m²
Kingspan Kooltherm K108 110mm110mm5.75 m²K/W4.21 kg/m²
Kingspan Kooltherm K108 120mm120mm6.30 m²K/W4.56 kg/m²
Kingspan Kooltherm K108 150mm150mm7.85 m²K/W5.61 kg/m²

While we have provided Thermal Resistance values for all thicknesses on the Kingspan Kooltherm K108 datasheet, some thicknesses may not be readily available.

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