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Fundo Ligno

Fundo Ligno

„The Specialist for Suspended Timber Floors.“

Product information

Homeowners and builders increasingly favor shower spaces which can function without a curb or would not require any build up over existing floor areas resulting in a step up into the shower. One important reason for this trend is: easier and safer access to the shower for older and/ or physically disabled persons. While this trend offers great design and business opportunities it also presents technical challenges which cannot be overcome by many conventional shower installation methods or products. Main challenges are safe recessing of a sloped shower base into an existing structural floor for a flush transition and the extension of waterproofing from shower area into surrounding floor areas no longer protected by a curb keeping water inside the shower area. To address all challenges for tile professionals, wedi engineered Fundo Ligno, a sloped shower base ¾ inches thin at its perimeter and available in various sizes. Ligno can be field modified. The installation within a ¾” plywood structure requires no cutting into joists. Load-bearing plywood is simply re-installed between floor joists and over 2 × 6 blocking then attached to the joists. This guarantees a full support and protection of the tiled surface. The wedi typical strong cement based, reinforced surface is pre-sloped, directly tileable with large or small format tile. Ligno interlocks with wedi Building Panel used as waterproof backer board on walls aswell as on the surrounding floor. Optionally, wedi‘s Subliner Dry Sheet Waterproofing membrane can be used. Both options offer a complete and professional system installation.

  • Pre-sloped and internally waterproof Point drain shower base system for Floor-Even and Barrier-Free Entry Showers
  • Eliminates cutting into Floor Joists when recessed. Sloped Shower Floor Base with only ¾” Profile/Thickness
  • Ready for tiling upon installation
  • 100% waterproof due to its extruded polystyrene (closed cell) foam core
  • Easy and clean to cut to size using a utility knife, circular saw or handsaw
  • Drain covers are height adjustable for a perfect finish with the tile selected

All advantages at a single glance

Technical properties Fundo Ligno


Fundo Ligno Shower Base Material XPS/ Extruded Polystyrene Foam Core covered with fiberglass mesh fully embedded in a cement 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 Length x width x thickness
073732015 wedi Fundo Ligno, square shower base, Center drain 48" x 48" x 3/4"
073732018 wedi Fundo Ligno, square shower base, Center drain 60" x 60" x 3/4"
073732014 wedi Fundo Ligno, rectangular shower base, Center drain 36" x 48" x 3/4"
073732016 wedi Fundo Ligno, rectangular shower base, Center drain 36" x 60" x 3/4"
073732017 wedi Fundo Ligno, rectangular shower base, Center drain 48" x 60" x 3/4"

Areas of use Fundo Ligno

  • New Construction of Residential/Commercial use buildings
  • Renovation in Residential/Commercial use buildings
  • For barrier free, ADA compliant or curbed installations
  • For customized or standard tiled showers
  • Over wooden or concrete substructures

Mandatory articles

Optional articles