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Brick Superstore£18.00Visit shop Celotex Light/Green Tb4025 General Purpose Pir Insulation Board - 2400 X 1200 X 25Mm
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The Celotex TB4020 is a high-performance polyisocyanurate (PIR) insulation board designed for contractors and homeowners seeking to improve thermal efficiency in walls, floors, and roofs. Its standout feature is an impressive 0.022 W/mK thermal conductivity, which allows for thinner insulation profiles while meeting strict energy regulations; however, users should note that as a rigid foam board, it requires precise measuring and cutting to ensure a tight, bridge-free fit during installation.
| Model Part Number | TB4020 |
|---|---|
| Brand | Celotex |
The TB4020 model is exactly 20mm thick.
Yes, it is suitable for floor applications, provided it is laid on a flat, even surface.
While it functions as insulation regardless, the low emissivity foil performs best when positioned next to an enclosed air space.
The foil facing acts as a vapor control layer, but the board should not be used in standing water or persistently damp environments.
Use a fine-tooth saw or an insulation knife in a well-ventilated area, wearing protective goggles and a dust mask.
Use a sharp insulation saw to shave thin layers off the edge rather than trying to force the board into place.
Fill small gaps with expanding foam insulation and cover joints with high-quality foil tape to ensure a continuous thermal barrier.
To install, measure your wall or floor area and cut the board using a fine-toothed saw or a sharp insulation knife. Ensure boards are tightly butted together to prevent thermal bridging—gaps allow heat to escape and moisture to build up. For best results, tape the joints using a dedicated foil tape to maintain the integrity of the vapor control layer.
Compatibility: The boards work well with timber frame and masonry structures. When storing, keep the boards in a cool, dry place, ideally off the ground, and protect them from prolonged exposure to direct sunlight or moisture during the construction phase.
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