I would like some advice on insulated plasterboards which I have fitted in my home and I am concerned about how flammable they may be. The product information says they have a rating of Class B-sl do but what does this mean please? How flammable are they (e.g. relative to wood?) thank you very much for any information you can provide.

Thanks, Jennie

The system is described here - as you see it's less combustible than wood:

https://www.paroc.co.uk/knowhow/fire/fire-classification