Retaining Walls solve the need for a change in grade.
The vast majority of architectural interiors incorporate gypsum wallboard [GWB], also known simply as 'drywall', in walls and ceilings. Usually not many details are required because gypsum is so ubiquitous. 24 billion square feet of GWB is used every year in the US. Everyone knows how it is supposed to look. Still, there are reasons to detail drywall...
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