If I apply WoodCream, is an additional product needed for fungicide protection? Is there a certification for WoodCream against wood-destroying fungi, such as blue stain fungus?

No, there is no certification but there are already strong biocides in WoodCream. However, we advise a minimum wood class in our warranty instructions.

If a better protection is needed, we would advise you to choose impregnated wood, copper-based (which you can recognize because of its green colour). 

If you still want to apply an extra coat of fungicide, we would advise you to use a product with IPBC.