Fire retardant application to timber cladding

[Mosh]

If timber cladding is found on the walls (and balcony - single means of escape route) of a low building, then I understand that it must meet a rating of euroclass B. There are plenty of companies who sell fire-retardant solutions to paint the timber. Do these tend to be reliable? And do they need specialist knowledge of how to apply them - e.g. to achieve desired depth of impregnation?

[AnthonyB]

It depends if they have been tested for the external application or not and who will certify the completed system. Certain products will only be sold to suitable installers - best to ask these people who have a lot of experience and tech support facilities -  https://envirograf.com/product/benefits-of-intumescent-paint-for-wood/

[Mosh]

Thanks very much for your help.