CMU Waterproofing Question

The contractor wants to use a split face unit for the single wythe load-bearing walls of a small building with two ADA restrooms and a small storage room for a private park. The building will be ventilated only. My concern is moisture intrusion into the interior spaces. The walls are not insulated.
Will a waterproofing coating at the exterior and the use of a waterproofing additive to the mortar keep water out of the wall system?
Is there an additive that can be added during the mixing and forming of the wall units?

​Some think that a single-wythe CMU wall cannot be effectively built to repel moisture. It can. I am attaching a NCMA TEK that can be very helpful. Water repellant is typically put into architectural CMU as a standard procedure especially if the units are colored. You MUST add the repellant to the mortar also. When this is done and you add a compatible flashing at the base of the wall. you should have the wall you are trying to get. If you want to stain or paint the wall I would suggest an elastomeric coating as it will bridge any small voids. You should contact Lisa Pelham (813-255-4737) @ Oldcastle or Daryl Gorenflo (407-280-1487) @ A-1 Block. Either are more than willing to help you, TIf I can also help I'm in Gainesville. Call me. Be safe.
Jerry Painter, FASTM,CGC, SMC
352-494-8955