Kingspan Insulation Thermaroof TR26 flat roof board Celotex Insulation

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, 140mm and 150mm.

The folllowing thicknesses are manufactured to order: 40mm, 105mm, 115mm, 125mm, 130mm, 135mm, and 160mm; these may carry minimum order levels.

Product Information

General information about Kingspan Thermaroof TR26

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


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


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

Product Properties

Thickness 25mm to 160mm
Board Length 2.4m
Board Width 1.2m
Board Edge Square

Product Prices

Buy Kingspan Thermaroof TR26

Product ex-VAT inc-VAT
Kingspan Thermaroof TR26 25mm, 12 x 1.2x2.4m = 34.56m² £313.53 £376.23
Kingspan Thermaroof TR26 50mm, 6 x 1.2x2.4m = 17.28m² £236.70 £284.04
Kingspan Thermaroof TR26 60mm, 5 x 1.2x2.4m = 14.4m² £227.41 £272.89
Kingspan Thermaroof TR26 70mm, 4 x 1.2x2.4m = 11.52m² £210.83 £252.99
Kingspan Thermaroof TR26 80mm, 4 x 1.2x2.4m = 11.52m² £236.51 £283.81
Kingspan Thermaroof TR26 90mm, 3 x 1.2x2.4m = 8.64m² £207.77 £249.32
Kingspan Thermaroof TR26 100mm, 3 x 1.2x2.4m = 8.64m² £217.06 £260.47
Kingspan Thermaroof TR26 110mm, 3 x 1.2x2.4m = 8.64m² £231.57 £277.88
Kingspan Thermaroof TR26 120mm, 2 x 1.2x2.4m = 5.76m² £170.77 £204.92
Kingspan Thermaroof TR26 140mm, 2 x 1.2x2.4m = 5.76m² £215.15 £258.18
Kingspan Thermaroof TR26 150mm, 2 x 1.2x2.4m = 5.76m² £217.54 £261.04
Aluminium Foil Tape 100mm x 50m = 50lm £10.17 £12.20

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
Compressive Strength 150 kPa at 10% compression BS / I.S. EN 826: 2013
Vapour Resistance > 100 MNs/gm BS / I.S. EN 12086: 2013
Nominal Density 32 kg/m³
Product Thickness Thermal Resistance kg/m²
Kingspan TR26 25mm 25mm 1.10 m²K/W 1.11 kg/m²
Kingspan TR26 40mm 40mm 1.80 m²K/W 1.50 kg/m²
Kingspan TR26 50mm 50mm 2.25 m²K/W 1.80 kg/m²
Kingspan TR26 60mm 60mm 2.70 m²K/W 2.15 kg/m²
Kingspan TR26 70mm 70mm 3.15 m²K/W 2.50 kg/m²
Kingspan TR26 80mm 80mm 3.60 m²K/W 2.80 kg/m²
Kingspan TR26 90mm 90mm 4.05 m²K/W 3.25 kg/m²
Kingspan TR26 100mm 100mm 4.50 m²K/W 3.50 kg/m²
Kingspan TR26 105mm 105mm 4.75 m²K/W 3.65 kg/m²
Kingspan TR26 110mm 110mm 5.00 m²K/W 3.99 kg/m²
Kingspan TR26 115mm 115mm 5.20 m²K/W 4.01 kg/m²
Kingspan TR26 120mm 120mm 5.45 m²K/W 4.10 kg/m²
Kingspan TR26 125mm 125mm 5.65 m²K/W 4.42 kg/m²
Kingspan TR26 130mm 130mm 5.90 m²K/W 4.60 kg/m²
Kingspan TR26 135mm 135mm 6.10 m²K/W 4.78 kg/m²
Kingspan TR26 140mm 140mm 6.35 m²K/W 4.80 kg/m²
Kingspan TR26 150mm 150mm 6.80 m²K/W 5.10 kg/m²
Kingspan TR26 160mm 160mm 7.25 m²K/W 5.59 kg/m²

Product Certificates

Please visit the Kingspan website for product certificates.