Celotex TB4025 25mm, 1.2×2.4m = 2.88m²


High performance rigid Polyisocyanurate (PIR) thermal bridging insulation board

Specifically designed to eliminate thermal bridges.

Suitable for use in a number of applications including roof, wall and floor systems.

Includes low emissivity foil facings giving improved thermal insulation performance within cavity air spaces.

Can be used to improve reliable long-term energy savings for buildings.

Thicknesses and Availability:

Available in most popular thicknesses at most depots; short lead-times may apply if we need to get stock in before delivering to site.

This TB4000 Range includes the following readily available product thicknesses: 20mm, 25mm, 30mm and 40mm.

Additional information


1 to 5 working days

SKU: CELTB4K025 Category:
Product ex-VAT inc-VAT  
Celotex TB4025 25mm, 1.2×2.4m = 2.88m² £11.70 £14.04

Availability Indicators

Celotex TB4000 is sent out from depots nationwide and is subject to the Local Depot Delivery minimum order levels and delivery charge thresholds.

Reasonable stock levels are generally held at most of our depots. In some geographic locations, depots may stock alternates, however, we will contact you to discuss before proceeding with the order.

Where products need to be brought in from Celotex, please allow approx. 1 week for delivery.

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

  • 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

Thermal bridge insulating board

Celotex high performance polyisocyanurate (PIR) foam board, TB4000, is suitable for use in pitched and flat roofs, solid masonry walls, timber and steel framed systems, and floors.

Product Make-up

Core: Celotex TB4000 is manufactured from rigid polyisocyanurate (PIR) using a blowing agent that has zero ozone depletion potential (zero ODP) and low global warming potential (GWP).

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

Product Performance

Thermal Conductivity 0.022 W/mK  
Compressive Strength 120 kPa at 10% compression BS EN 826:2013
Vapour Resistance > 300 MNs/gm