Celotex Other FAQs

CE marking confirms that our products fully comply with BS EN 13165 and that key performance characteristics have been verified through independent type testing.

This is a very clear method of confirming that delivered products match your actual specification. Competitors that don't CE mark cannot match this level of transparency.

It is more expensive off the shelf than cheaper insulants like mineral fibre loft insulation, but usually the same price as a polyurethane board.

However, PIR boards reduce the usable space loss in buildings They also require less costly mechanical fixings and don't need supporting materials to hold them in place.

Celotex is very well known throughout the construction industry and is supported by a nationwide network of leading distributors and builders merchants.

Visit our Stockists page to find your nearest stockists.

Celotex FF4000 and GA4000 have the same thermal efficiency.

FF4000 products are more dense with a safe uniformly distributed load (UDL) of 140kN/m2 whereas GA4000 has a 120kN/m2 UDL.

FF4000 is recommended for use in floors beneath a screed, particularly where underfloor heating is proposed.

Read more about Celotex FF4000 and Celotex GA4000 applications and product datasheets.

Celotex is expected to remain efficient for the life of the building, and the Lambda values published have been prematurely aged in accordance with British Standards.

Celotex is classed as combustible when tested in accordance with BS476 and has a class 1 surface spread of flame when tested to the same standard.

The specific heat capacity c_p states how much heat energy is required to increase the temperature of 1kg mass of a material by 1K. Specific heat capacity c_p is measured in J/(kg·K).

More heat energy is required to raise the temperature by 1K of a material with a greater heat capacity. And inversely, less energy is required to produce a 1K increase in temperature in materials with lower heat capacities.

Calculated values of specific heat capacity c_p of various materials
Material Specific heat capacity c_p = J/(kg·K)

• Rigid polyurethane foam (PUR/PIR) 1400 – 1500
• Wood-fibre insulation boards 1400
• Mineral wool 1030
• Wood and wood-based materials 1600
• Plasterboard 1000
• Aluminium 880
• Other metals 380 – 460
• Air (ρ=1.25 kg/m³) 1000
• Water 4190

Due to our recent technology breakthrough in achieving a super low lambda of 0.021W/mK, our FR, CG and SL products have been re-branded to reflect these results.

This is the only difference between the products which will help you to achieve better U-values.

Celotex FR5000

Celotex CG5000

Celotex SL5000