What type of mesh tape and bonding agent do I use to unite CBU and greenboard? CBU to drywall? In the below picture, there is about 2 inches of greenboard below the window sill. Regular drywall was used on the rest of the walls that aren't exposed to water.
Does anyone recommend using some type of silicone between the CBU and greenboard/drywall?
Also, what type of boding agent and mesh tape do I use to unite the CBU to CBU?