Hailey_Stowers

good luck! mold is a real house killer, in my opinion. my friend had mold under the sink in her bathroom and they pretty much demolished have of her room. i hope you have an easier fix than her

joecaption

All of the prevention needs to be done on the outside. All you have done is exposed the symptoms caused by the deck being installed wrong.
Someone needs to remove the siding to see how rotted and molded up the sheathing is. Check the flashing or lack of it, add something like Storm and Ice shield to the lower wall area.