The best dry rot treatment is to cut off the infected wood and then seal the cut end with a good sealant. If you have a large area of infected wood, you may need to remove it and replace it with new wood. You can also use a chemical treatment to help kill the fungus, but this is not always successful.

There is no one-size-fits-all answer to this question, as the best dry rot treatment will vary depending on the severity of the infestation and the type of wood that is affected. However, some common treatments for dry rot include injecting the affected area with a fungicide, sealing off the area to prevent further moisture damage, and replacing any damaged or rotted wood.