Why do players float buildings around with troops?

Question

Why do terran players float buildings with their armies? Does the computer automatically target buildings?

Answer

There's a couple of advantages to having a floating building with your army.

• if you otherwise lack Air Units, they provide line of sight to shoot up cliffs
• if the building is over your army, it is much harder to select the units under the building for focus-fire, since the building is in the way.

Generally, any building that is being floated (by a good player, anyway) would otherwise have been idling - Barracks after switching to a mech army, for instance, or command center without a mineral patch to land at.

There may be other reasons, but those are the biggest, I think.

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