So, are wood composite deck boards fire rated?
The fire rating is more of a classification of its reaction to fire. And, by that, you could argue that composite decking has a fire rating. However, this would be misleading to the majority of people who were asking.
This classification is different for each board and is dependent on its makeup. Before installing, always make sure that you check the datasheet of the deck board to ensure you know the classification and how it performs. Realistically, composite decking as a wood composite will generally achieve a class C fire classification, but in some circumstances, it can achieve a class B fire rating.