Kohler K-T97330-4 Guide D'installation Et D'entretien page 5

Prepare the Site (cont.)
NOTICE: Adequate floor support is required. The wood support
must be a minimum of 2" (51 mm) thick by 6" (152 mm) wide. 2x6
lumber is NOT adequate for this application.
NOTE: Concrete can be used as the floor support.
Plan out the bath filler placement based on the dimensions above.
Cut a hole in the subfloor large enough to install the wood
support between two floor joists.
Secure a wood support 2-3/8" (60 mm) - 3-3/16" (81 mm) below
the height of the finished floor.
Kohler Co. 5 1240533-2-C