Looking for suggestions on the preferred method of providing support for the vertical garage door track on a SIP wall. Attached is a profile of the jamb area (without sill seal or termite shield shown). My major concern is the section against the concrete foundation wall. A 2x4 is fine along the SIP's OSB but I question whether a treated 2x4 will negatively affect the track hardware. A layer of fiber-cement board along the foundation behind the untreated 2x4?

Thanks,

RickG