Celotex insulation boards have a Euroclass rating of F, which is considered the worst rating in terms of combustibility. However, it’s important to note that poor Euroclass ratings do not mean the material is unsuitable for home use.
The rating simply means it will not stop the spread of fire, so using fire-resistant materials in conjunction with Celotex PIR insulation products is ideal.
Celotex is a great alternative to Kingspan PIR insulation products.