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When researching insulation for your home or building project, one of the most common comparisons people search for is “Celotex vs Kingspan – which is better?” Both brands are major players in the UK market, offering high-quality PIR insulation boards suitable for walls, roofs and floors. Kingspan also manufactures the premium Kooltherm phenolic range, which performs differently from standard PIR.
This guide provides a clear comparison of Celotex vs Kingspan, explaining the differences, performance levels and the best choice for your project.
The key difference lies not in their standard PIR boards, but in Kingspan’s extra product line:
When comparing standard PIR boards, Celotex and Kingspan are effectively like-for-like products with extremely similar performance. The only meaningful performance jump comes from Kingspan’s Kooltherm phenolic insulation.
If you're comparing Celotex PIR vs Kingspan PIR, the differences are minimal:
When comparing Celotex TB/GA/XR with Kingspan TP/TW/TF, you’re essentially looking at the same type of insulation with different branding.
Because performance is so similar, the choice often comes down to:
If you're wondering “Is Celotex the same as Kingspan?” or “Are they interchangeable?” — for standard PIR boards, the answer is yes.
Many people searching “Which is better, Celotex or Kingspan?” are actually comparing Celotex PIR with Kingspan’s Kooltherm phenolic insulation.
Kooltherm is not PIR — it’s phenolic insulation, and it performs significantly better:
If you’re comparing Celotex vs Kingspan Kooltherm, Kooltherm almost always wins in thermal performance — although it does cost more.
Common search queries include:
The simple answer: yes — phenolic insulation outperforms PIR.
Both brands manufacture insulated plasterboard, but Kooltherm boards offer thinner, higher-performance solutions.
If you're asking “Which is cheaper, Celotex or Kingspan?” here's the general trend:
If cost is more important than thickness, PIR from either brand offers excellent value.
Choose Celotex PIR or Kingspan PIR if:
Choose Kingspan Kooltherm if:
For standard PIR insulation boards, neither brand is objectively “better” — Celotex and Kingspan PIR products (TB/GA/XR vs TP/TW/TF) are extremely similar and often interchangeable.
However, when comparing overall performance, Kingspan comes out ahead thanks to the Kooltherm range. Its phenolic core provides superior thermal efficiency, making it the best option when you need high performance or reduced thickness.
