Do I need to install drywall first on vaulted ceiling that will have Shiplap wood installed?
Hey Greg. No u dont require drywall behind the shiplap. The time you will require that is if its in a basement apartment and you need the required burn time to meet building code.
No. And not trying to be rude but why would you ask that question? Do you need to furr the joice out because of its unevenness?
Interior wall and ceiling finishes in houses (regardless of whether basement suite or not) are required to meet a flame spread rating of 150; shiplap is OK provided it meets the required flame spread rating.
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