Hello.
We are doing a small renovation and have noticed past water staining on the bottom plate of a wall. I would like some input on how to prevent further damage going forward. Details below.

Climate: HIgh elevation Semi-Arid 18″ of rain/snow per year. High winds from the Southwest for a large portion of the year results in wind driven rain and snow. Snow drifts typically form along some walls depending on storm direction. 

The wall in question is southwest facing, so it receives heavy sustained winds for large portions of the year. In spring/fall/winter it receives heavy strong sun. 

The original house construction is 2×6 wall framed 24″ OC. Tyvek Housewrap was applied direct to studs with 19/32 T1-11 original siding over this as a sheathing/siding combo. Slab on grab foundation. Bottom plate is at the edge of the slab, no concrete shows. The house and siding is 28 years old. All south and west facing lower siding shows signs of damage and deterioration. Typical 18-24″ overhangs all around

I’m removing all damaged siding and replacing with either 19/32 plywood or OSB (to be determined based on final costs). TyVek housewrap will then be applied over the sheathing, followed by LP Smartside or Hardieplank to upgrade the look of the house.

Question is at the bottom plate…. I want to flash and protect the original bottom plate against further damage. No original foam gasket between concrete and concrete was used.

Options? Doesn’t need to be cheap . Thoughts?

Liquid flash? ZIP liquid flash? Prosoco? Other brand?
Metal flashing? Z-style? Or a flashing with a kickout similar to a roof drip edge? Or perhaps just apply flat metal flashing on the bottom 8″ or so of sheathing and 2″ below the bottom plate? 

Lastly, I even wondered about liquid waterproofing (Redguard or Mapei) for this small area…. then wrap over everything. 

Can upload pics if needed, but pretty standard Southwest construction techniques here. (Very poor waterproofing was used in dry climate).