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Fundo One-Step-Shower-System

Fundo One-Step-Shower-System

„Quick and easy installation.“

Product information

The wedi Fundo One-Step-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“ x 4” 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
  • 6 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 One-Step 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

Product video: Fundo One-Step-Shower-System

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
Surface Burning Characteristics; ASTM E84-04 Passed
Tensile Strength (Thinset Mortar to wedi Coating to Foam); ASTM D 1623 59 PSI
Shear Strength (Thinset Mortar to wedi Coating to Foam); within ANSI 118.10-1999; wet conditions 39 PSI
Compressive Strength; ASTM D1621 54 PSI
Waterproofness; ASTM D4068 and within ANSI 118.10-1999 Passes
Waterproofness of Assembled System; IAPMO PS 106-2015 Passes
Capillarity 0
Temperature Exposure Limits -58°F to + 175°F
R- Value; ASTM C518 4.3hr ft. 2 F/Btu/in (R – value for 1 inch of wedi foam = 4.3
Robinson Floor Test; ASTM C627 Heavy Duty Commercial Use, Passes
Fungus & Bacteria Resistance; ASTM G21 No Growth , Passes

Building & Plumbing Code Compliance
2015,2012,and 2009 International Plumbing Code (IPC) Compliant
2015,2012, and 2009 International Residential Code (IRC) Compliant
2015,2012, and 2009 International Building Code (IBC) Compliant
2010 and 2005 National Plumbing Code of Canada Compliant
2012 and 2009 Uniform Plumbing Code (UPC) Compliant
2012 and 2009 National Standard Plumbing Code (NSPC) Compliant
ANSI 118.10-2008 Load – Bearing Bonded, Waterproof Membranes for Thinset Ceramic Tile and Dimension Stone Installations Compliant
ASME A112.6.3-2001 (R07) Floor and Trench Drains Compliant
IAPMO PS 46-2012 Field Fabricated Tiling Kits Compliant
IAPMO PS 106-2015 Tileable Shower Receptors and Shower Kits Compliant
New York City Approval OTCR Approved
City of L.A. Approval Approved; Report No M-100017 in reference to ICC ES PMG 1189
Illinois State Approval IDPH Approved
Michigan State Approval Approved ; Report 1625-PA
Wisconsin State Approval Approved, File 20130265
Massachusetts State Approval Approved; P3-0315-306 &P3-0315-306
North- America Approvals Code Compliances & Quality Management ICC ES PMG 1189

Product sizes

Order no. Designation External Dimensions:
L x W x H,
US4000004 Fundo One-Step Shower Base, center drain 36" x 36" x 4"
US4000005 Fundo One-Step Shower Base, center drain 36" x 48" x 4"
US4000008 Fundo One-Step Shower Base, center drain 32" x 60" x 4"
US4000003 Fundo One-Step Shower Base, center drain 36" x 60" x 4"
US4000006 Fundo One-Step Shower Base, left drain / Tub Replacement Base 36" x 60" x 4"
US4000007 Fundo One-Step Shower Base, right drain / Tub Replacement Base 36" x 60" x 4"

Areas of use Fundo One-Step-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

Optional articles