25mm Celotex TB4025 formerly TB3025 Insulation Board 2400x1200mm is a High Performance Rigid PIR Insulation Boards. Celotex TB4025 25mm is a high performance PIR insulation that's ideal for overcoming thermal bridging and for use in two layer build-ups, including between and under rafters and over stud in timber frame wall lining applications. This is also the ideal product type to use as perimeter up-stands in concrete floor constructions.

This multi-purpose PIR Insulation board is one of our biggest selling products due to is diversity in application and it also achieves an A+ rating when compared to the BRE Green Guide.

The General application range of Celotex products are split in to three size categories
TB4000 12mm - 40mm
GA4000 50mm - 100mm
XR4000 120mm - 200mm

These are all essentially the same product but with varying thicknesses of Insulation Board.
Celotex Insulation boards are made from a expanded Polyisocyanurate (PIR) insulation foam with a foil facing to both sides.

Specifications

Length: 2.4m.
Width: 1.2m.
Coverage: 2.88m2.
Thickness: 25mm.
rValue: 1.10m2K/W.
Weight: 0.85kg/m2.
Thermal conductivity: 0.022 W/mk - BS EN 12667.
Compressive strength: 120kPa - BS EN 826.
Water vapour resistance: >150MNs/g - BS EN 12086: Method B.
Spread of flame: Class 1 - BS 476-7.Lambda Value = 0.022
Thickness = 25mm
Please note : Due to recent national shortages of PIR insulation, We now offer Celotex, Ecotherm, Recticel and Iko to help to offer a speedy delivery. You may be offered an alternative brand due to local stock availability.