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Cut the 2” (50.8 mm) pipe
flush to the surface of the floor
construction. Make sure that
the cut out fits to the OneStep
base drain. Cut out a 5” (127
mm) diameter hole around the
2” (50.8 mm) pipe to allow the
wedi drain to be inserted into
the subfloor. The drain and
trap have to be safely fastened
to the subfloor.
Set up a continuous 1/4” (6.4
mm) bead of wedi sealant
along the top side of the wedi
OneStep valve groove profile.
Drop the drain body firmly into
the sealant. Turn the OneStep
base upside down and apply
the rubber and the fiber gas-
ket. Tighten the gaskets firmly
to the base’s steel ring.
03
Dry fit the base and make sure that floor drain is located in the center
of the wedi drain. Make sure the base walls are square and tight with
the framework.
Skim coat the thinset ANSI 118.4 and comb through with a 1/4 × 1/4”
(6.4 × 6.4 mm) notched trowel. Channels pointing to the entrance.
Trowel the thinset on the rear side of the OneStep again using a 1/4 ×
1/4” (6.4 × 6.4 mm) notched trowel. There are different ways to en-
sure good bond of the wedi Base to the subfloor. Required is a setting
bed thickness of min. 3/16“ (4.8 mm) and max. of 5/16“ (7.9 mm)
(compressed). Applying thinset on both, wedi Base and subfloor, is a
best practice recommended to achieve full surface coverage adhesion.
05 06
Press the Fundo OneStep
firmly into the thinset bed,
ensuring that the installation
is level and void free. Apply
some weight equally and for at
least 30 minutes (thinset bags).
Set up the rubber caulking gas-
ket (bevelled side up) around
the 2” (50.8 mm) pipe in the
subfloor. The rubber gasket
must be flush with the upper
end of the 2” (50.8 mm) ABS
or PVC pipe. Tighten the con-
nection using caulking nut,
metal guide and screw driver.
07
You can now install waterproof wedi 1/2“ (12.7 mm) Building Panels
directly to the framework and seal all joints and fastener points as usual
and per wedi Building Panel installation guidelines (you may install other
Backer boards but have to add topical waterproofing / membranes). Your
shower is ready for tile
wedi OneStep Installation
Before Installation:
 Subfloor is stable, even and load-bearing, and meets deflection cri-
teria of maximum L/360 and requirements as per IRC. Wooden or
concrete structural substrates are dry and sufficiently load-bearing
considering live and dead load. Wood and Steel framing is sufficiently
load-bearing, plum and square.
 Floor drain assembly below floor is stabilized, fixed and supported in
position, and will not sink under water load.
 Installer has received instructions from wedi Technical Sales Staff or is
informed about proper installation methods as described.
Please note important considerations for “After Installation“ and
refer to such text in the installation manual for wedi Fundo One-
Step in this handbook.
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