Kohler Avid T97367-4-BN Mode D'emploi 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, as long as the
faucet base will be below the finished floor level.
Plan out the bath filler placement based on the dimensions above.
Cut a hole in the subfloor that is large enough to install the wood
support between two floor joists.
Secure a wood support 2-7/8" (73 mm) by 3-11/16" (94 mm)
below the height of the finished floor.
Kohler Co. 5 1333549-2-A