Yes, drywall should be installed on the ceiling surface prior to installing our Shallow Beam Coffered Ceiling Kit for the following reasons:
1. The underlying ceiling surface will be visible within the center of each coffer.
2. Your local fire code will more than likely require a layer of drywall on the ceiling as a fire barrier between floors along with a scratch coat of joint compound.
3. It will provide a clean continuous surface on which to mark center of the ceiling and to snap guide lines to aid in the installation process.