I am in the process of fixing a poorly kept and built 2nd floor Accessory Dwelling Unit/garage apt. The most pressing project is to rebuild/repair the 2nd story deck, which gives access to the apt. The entire structure has T1-11 sheet siding, it's rotted where the deck ledger was improperly attached to the siding and no gap placed between house and the first deck board. I think someone tried to fix this before and replaced rotted wood and reinstalled ledger onto siding again. The deck is slightly sloping towards the house so I suspect when they previously tried repairing they detached the deck from house without bothering with temporary support.
Any suggestions on how I can support it to fix the deck ledger?