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Brick Superstore£58.80Visit shop Celotex Green High Performance Insulation Board Xr4120 - 2.4M X 1.2M X 120Mm Pir
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The Celotex XR4000 is a versatile, high-performance polyisocyanurate (PIR) insulation board ideal for builders, architects, and DIY renovators seeking to improve energy efficiency in roofs, floors, and walls. Its primary benefit is a high thermal conductivity of 0.022 W/mK, allowing for superior insulation with thinner profiles, though users must note that precise cutting and fitting are required to prevent thermal bridging.
| Model Part Number | XR4120 |
|---|---|
| Brand | Celotex |
Yes, it is designed for use in both pitched and flat roof systems.
The Celotex XR4000 has a thermal conductivity of 0.022 W/mK.
The foil facing acts as a vapor control layer, but always ensure all joints are taped to create a continuous barrier.
The XR4000 is primarily intended for use within the structure (internal or between-studs). Consult local building codes for external application suitability.
Store them inside or under a cover, kept off the ground on pallets, and protected from inclement weather.
Yes, it is specifically designed for use in both timber and steel-framed construction.
Use a straight edge and a sharp utility knife to scribe the board accurately before cutting.
Minor surface tears in the foil can be repaired using high-quality aluminum foil tape to maintain the vapor barrier.
Fill any small gaps with expanding polyurethane foam insulation to prevent cold bridging.
To install the XR4000, ensure the substrate is dry, clean, and level. The boards can be cut easily using a fine-toothed saw or a sharp insulation knife. When fitting into cavities, ensure tight joints to avoid thermal bridging, which can occur if gaps are left between boards. For fixing, use appropriate mechanical fasteners or adhesives recommended for PIR materials. Keep the boards covered and off the ground during site storage to prevent moisture saturation or physical damage. Always refer to local building regulations regarding fire safety and ventilation when installing the boards in roof or wall voids.
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