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Fundo OneStep Shower System

Fundo OneStep Shower System

"Quick and easy installation."

Product information

The Fundo OneStep Shower System is a simple installation solution for shower bases.

Internally waterproof and pre-sloped shower floor base with factory integrated and waterproof point drain connection, as well built in pre-sloped curb and perimeter walls for fast track installations that eliminate the many different steps and products involved in traditional mortar bed or semi pre-fabricated sheet – or liquid membrane system installations.

Fundo OneStep is available in several standard sizes to fit predetermined shower stalls, featuring centered and off-centered drain location options. Fundo OneStep is available in custom sizes incl. custom drains, such as linear drains, upon request. Fundo OneStep can be directly tiled over upon installation and there is no limitation to the size of tile or type of tile and cement based tile setting materials selected.

Fundo OneStep is available with select drain cover options. Due to the precise slope fields of the Fundo OneStep, large or small format tile may be used. Within each slope field the tile will be fully supported over an even yet sloped surface. Where slope fields meet, grout lines should be designed when using tile larger than 4 in. x 4 in. as these should not span across two slope fields.

The OnesStep bases can be installed in combination with wedi Building Panel or with alternative tile backer boards, such as cement boards, if these are topically waterproofed in the field.

  • Fundo base with integrated wall and curb
  • 3 different sizes with custom options
  • Passes ANSI Z124.1.2 / National Approval ICC PMG report 1189
  • Use with wedi building panels or other types of baker board (most will require added waterproofing)
  • Solid, pre-sloped. directly tileable surface
  • Can be used with small & large format tile; set with modified thinset
  • Square, high quality stainless steel drain, cover / frame
  • No seam & no leak potential due to installation mistakes
  • Easy drain hook up to floor pipes cut flush with subfloor
  • Subfloor attachment with only thinset adhessive
  • wedi OneStep requires no thick mortar bed underneath unlike common competitive preformed units which require added support
  • No more epoxy thinset tiling as with other common prefabricated shower floors

Technical properties - Fundo One-Step-Shower-System

Drain technical properties
Factory integrated drain connection valve in shower base and field installed compression fit drain unit provided in each system. Drain unit seals to all nominal 2” schedule 40 floor pipes made of ABS or PVC. Special sealing gaskets are available to seal to 2” or 1 ½” Cast Iron or Copper Pipe. Glue/ Cement Connection drain available in ABS for nominal 2” schedule 40 floor pipes.

Fundo OneStep Shower Base Material XPS/ Extruded Polystyrene Foam Core covered with a heavy duty, sanded, epoxy based resin coating
Thermal Conductivity (75°F (25°C) - ASTM C518) 0.23 Bbtu in/hr F
Tensile Strength (ASTM C297) 65 PSI
Shear Strength (Under conditions required in ANSI A118.10-1999) 28 day Shear Strength: 95 psi
84 day Shear Strength: 100 psi
100 day Shear Strength: 98 psi
Waterproofness; ASTM D4068 / ANSI A118.10-1999 Passed
Capillarity 0
R-Value 75°F (25°) - ASTM C518
4.3hr ft. 2 F/Btu/in (R Value for 1” wedi = 4.3)
Flexural Strength (ASTM C947) 627 psi
Robinson Floor Test (ASTM C627) Heavy duty commercial use, passed
Fastener Pull Through (ASTM C473) Wet 131.8 lb./Dry 196.2 lb.
Temperature Limits -58 / +175° F
Freeze & Thaw (ASTM C666 - 25 Cycles) No disintegration/change
Waterproofness of Assembly (ASTM E331) Passed, wedi Fundo Kit assembly (complete sytsem)
Fungus / Bacteria Resistance (ASTM G21) Passed, No Growth
Accelerated Aging (AC 71 - 25 Cycles) No disintegration
UL 1715 (Fire Test of interior Finish Material) Passed, flame spread <10
Linear Variation (ASTM D 1037 (ICC –EG 159)) Passed, less than 0.07%
Surface Burning Characteristics (ASTM E84-16) Classification A:
Flame Spread Index (FSI): 20
Smoke Developed Index (SDI): 70
Floor and Trench Drain Compliance (ASME A112.18.2) Passed, Compliant (ICC PMG 1189)

Product sizes

Order no. Designation External Dimensions:
L x W x H,
US4000004 Fundo OneStep Shower Base, Center Drain 36 in. x 36 in. (914 x 914 mm)
US4000006 Fundo OneStep Shower Base, Offset drain left 36 in. x 60 in. (914 x 1524 mm)
US4000007 Fundo OneStep Shower Base, Offset drain right 36 in. x 60 in. (914 x 1524 mm)

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Areas of use Fundo OneStep Shower System

  • New Construction of Residential/Commercial use buildings
  • Renovation in Residential/Commercial use buildings
  • For customized or standard tiled showers
  • Over wooden or concrete substructures

Mandatory articles

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