There's no such thing as culture—only cultural practices. If you try to manage culture from the top-down, it just doesn’t work. If you offer individual policies that direct action, it can shape the behavior of an entire group. Take it from a school of fish.
The success of your company will be defined by the culture of communication you set across your team. Read this post where the founder of Unreasonable shares the "communication architecture" of the team at Unreasonable Group.