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ANSI Rule for measuring rooms with sloped ceilings.

How much do you add for the exterior walls in rooms with sloped ceilings?

What’s the width of an “average” exterior wall?

What does ANSI say about using interior dimensions to get exterior measurements? Where does the Rule come from?

What’s the width of an “average” exterior wall?

What does ANSI say about using interior dimensions to get exterior measurements? Where does the Rule come from?

What’s the width of an “average” exterior wall?

What does ANSI say about using interior dimensions to get exterior measurements? Where does the Rule come from?