Kingspan Thermaroof TR26


High performance rigid Polyisocyanurate (PIR) flat roof insulation board

Can be used on flat roofs with mechanically fixed single-ply waterproofing membranes.

Fully compatible with most mechanically fixed single–ply waterproofing systems.

Compatible with most green roof systems.

Ideal for new build and refurbishment.

Resistant to the passage of water vapour.

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 Thermaroof Range includes the following readily available product thicknesses: 25mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm and 150mm.

The following thicknesses are manufactured to order: 40mm, 105mm, 115mm, 125mm, 135mm, and 160mm; these may carry minimum order levels.


Product options


Availability Indicators

Kingspan Thermaroof TR26 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

Flat roof insulating board

Kingspans high performance polyisocyanurate (PIR) foam board, Thermaroof TR26, is suitable for use in flat roofs waterproofed with mechanically fixed single-ply waterproofing and most green roof applications.

Product Make-up

Core: Kingspan Thermaroof TR26 is manufactured with Nilflam technology, a high performance fibre–free rigid thermoset polyisocyanurate (PIR) insulant.

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

Product Properties

Thickness25mm to 160mm 
Board Length2.4m 
Board Width1.2m 
Board EdgeSquare 

Product Performance

Thermal Conductivity0.022 W/mK 
Compressive Strength150 kPa at 10% compressionBS / I.S. EN 826: 2013
Vapour Resistance> 100 MNs/gmBS / I.S. EN 12086: 2013
Nominal Density32 kg/m³ 

Product Variants

ProductThicknessThermal Resistancekg/m²
Kingspan TR26 25mm25mm1.10 m²K/W1.11 kg/m²
Kingspan TR26 40mm40mm1.80 m²K/W1.50 kg/m²
Kingspan TR26 50mm50mm2.25 m²K/W1.80 kg/m²
Kingspan TR26 60mm60mm2.70 m²K/W2.15 kg/m²
Kingspan TR26 70mm70mm3.15 m²K/W2.50 kg/m²
Kingspan TR26 80mm80mm3.60 m²K/W2.80 kg/m²
Kingspan TR26 90mm90mm4.05 m²K/W3.25 kg/m²
Kingspan TR26 100mm100mm4.50 m²K/W3.50 kg/m²
Kingspan TR26 105mm105mm4.75 m²K/W3.65 kg/m²
Kingspan TR26 110mm110mm5.00 m²K/W3.99 kg/m²
Kingspan TR26 115mm115mm5.20 m²K/W4.01 kg/m²
Kingspan TR26 120mm120mm5.45 m²K/W4.10 kg/m²
Kingspan TR26 125mm125mm5.65 m²K/W4.42 kg/m²
Kingspan TR26 130mm130mm5.90 m²K/W4.60 kg/m²
Kingspan TR26 135mm135mm6.10 m²K/W4.78 kg/m²
Kingspan TR26 140mm140mm6.35 m²K/W4.80 kg/m²
Kingspan TR26 150mm150mm6.80 m²K/W5.10 kg/m²
Kingspan TR26 160mm160mm7.25 m²K/W5.59 kg/m²