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Brick Superstore£70.80Visit shop Celotex Light/Green High Performance Insulation Board Xr4140 - 2.4M X 1.2M X 140Mm Pir
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The Celotex XR4140 is a high-performance polyisocyanurate (PIR) insulation board engineered for contractors, builders, and DIY enthusiasts looking to achieve superior thermal efficiency in residential or commercial projects. Its primary benefit is a high R-value of 6.35m2K/W, which allows you to reach target U-values with thinner materials compared to traditional insulation; however, users should note that the 140mm thickness requires precise planning for structural clearance and fitting.
| Model Part Number | 778052 |
|---|---|
| Brand | Celotex |
The thermal conductivity is 0.022 W/mK.
Yes, it is highly suitable for use in solid floors due to its rigid and compressive strength.
A standard fine-toothed hand saw or a circular saw with an appropriate blade is sufficient.
While the foil facing is moisture-resistant, the board should not be used in standing water or as a primary waterproofing layer.
The 140mm board provides an R-value of 6.35m2K/W.
The low emissivity foil facing acts as an effective vapor control layer when joints are properly sealed with foil tape.
Trim the edge by 5-10mm using a fine-toothed hand saw to ensure a snug, gap-free fit without forcing the board.
Fill any small voids with expanding insulation foam and cover all seams with high-quality aluminum foil tape to prevent thermal leakage.
To install, measure your space accurately and use a fine-toothed saw to cut the boards to size. When fitting between joists or studs, ensure a tight friction fit to minimize air gaps. For optimal performance, seal joints using aluminum foil tape to maintain a continuous vapor control layer.
Compatibility includes standard timber framing, metal studs, and concrete substrates. Always store boards in a dry, cool environment off the ground to prevent moisture damage to the core. If working in dusty conditions, wear appropriate respiratory protection when cutting.
