O/T- Patio Building Question(Kinda Long)

On the house I recently moved into there used to be a deck built off the back of it, and water and debris got trapped between the deck and the wooden siding of the house above the foundation and rotted alot of the boards from the sill plate on up.

I got rid of the old deck and would like to put a concrete patio in it"s place. I"d like it raised up so that the top surface of the patio is roughly the same height as the old deck rather than having steps immediatly out of the doors down to a ground-level patio. The bottom of the door sills are about 3 foot off the ground.

Figured I could make a retaining wall out of concrete block around the edges of where the patio will be, fill that with dirt, and pour a slab on top.

Problem is, the top of the house foundation is only about a foot above ground level, leaving a foot or so of wood siding above the concrete foundation level and below the door level that would be covered up with the patio(this is new wood that replaced what was rotted out from the old deck).

What would be the best way to prevent this wood from rotting out again in the future and avoid having to tear the concrete patio out to repair the wood again someday?

Should there just be an air/water gap left between the patio and the house? Or some kind of rubber or metal moisture barrier? There"s alot of trees here so any gap would need to be able to be cleaned periodically.

Just in the planning stages now, so any thoughts or ideas would help! I dont want to go with just another regular wooden-looking deck again.
 
You could put some ice and water barrier against the new wood and then some galvanized metal over that. Make sure the metal goes up to the bottom of the door and you should also flash or seal the top edge so water doesn't get between the flashing and the new wood.
 

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