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Concrete
Tile or Floor
Covering
Module Threshold
Concrete
1. Install the Pit (Optional)
Concrete Pit Installation
Use a concrete pit installation when a low outside threshold is either required or desired.
The finished floor must be no more than 1/2" (1.3 cm) 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" (1.9 cm) minimum pit into the subfloor.
Make sure the subfloor is flat and level.
Wood-Framed Sunken Installation
Framing 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
the module threshold height or a maximum of 1/2" (1.3 cm) below the module threshold height.
Make sure the subfloor is flat and level.
Wheelchair Ramp Alternative
Build a wheelchair ramp above the subfloor up to the outside threshold of the module.
Make sure the subfloor is flat and level.
1030529-2-B
Wood-Framed
Tile or Floor
Covering
2" (5.1 cm)
to 3-1/4"
(8.3 cm)
Underlayment
Subfloor
2" (5.1 cm)
Module Threshold
to 3-1/4"
(8.3 cm)
2" (5.1 cm)
to 3-1/4"
(8.3 cm)
Ramp
Floor Joists
8
Wheelchair Ramp
Tile or Floor
Covering
Module Threshold
3-1/4"
(8.3 cm)
Subfloor
Kohler Co.