Tile Or Floor
Covering
Module Threshold
Concrete
Concrete
1. Pit Installation
Concrete Pit Installation
Use a recessed pit installation when a low outside threshold is either required or desired.
For a pit installation, the finished floor must be no more than 1/2" (1.3cm) below the top of the
outside threshold. For the easiest wheelchair entry and exit, the finished floor should be flush with
the outside threshold of the module.
A typical tile installation will require a 3/4 " (1.9cm) minimum pit into the subfloor.
Make sure the subfloor is flat and level.
Wood-Framed Sunken Installation
Framing for a wood-framed sunken installation must be similar to the framing used in a stairwell.
The designer or architect should specify the quantity and size of the reinforcing joists and headers.
Size the joists, subflooring, underlayment and floor covering to make the finished floor flush with,
or a maximum of 1/2" (1.3cm) below the module threshold height.
Make sure the subfloor is flat and level.
Wheelchair Ramp Alternative
An alternative to a pit installation is to build a wheelchair ramp above the subfloor up to the
outside threshold of the module.
Make sure the subfloor is flat and level.
2. Prepare the Site
Ensure that the installation area is clean and free of all debris. If remodeling, remove all finished
wall material to expose the framing and remove all floor coverings to expose the subfloor.
Inspect the flooring at the installation site. Repair as necessary.
Make sure the sub and finished floors are flat and level.
1030530-2-A
Tile Or Floor
Covering
2" (5cm)
to 3-1/4"
(8.3cm)
Underlayment
Subfloor
Wood-Framed
2" (5cm) to
3-1/4"
Module Threshold
(8.3cm)
2" (5cm)
to 3-1/4"
(8.3cm)
Ramp
Floor Joists
4
Tile Or Floor
Covering
Module Threshold
3-1/4"
(8.3cm)
Subfloor
Wheelchair Ramp
Kohler Co.