wedi Fundo Primo
Versatile floor element with point drainage

Fundo Primo

"Floor-level shower elements for effective use of space."

Product information

Internally waterproof and pre-sloped shower floor base with factory integrated and waterproofed point drain connection 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 Primo can be customized in the field and cut to size fitting shower stalls smaller than the nominal size of the product. Fundo Primo is available in select sizes featuring centered and off-centered drain options.

The bases come with even perimeter thickness for easy recessing into subfloor construction while curbs can be used with Fundo Primo as well. Fundo Primo 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 Primo is available with select drain cover options. Due to the precise slope fields of the Fundo Primo, 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.

100% waterproof due to its extruded polystyrene ( closed cell) foam core

100% mold and mildew proof due to the product ‘s natural composition.

Precisely pre-sloped and ready to tile surface made of reinforcing fiberglass mesh embedded in a heavy duty cement resin coating performing as a strong tile backing and strong enough surface to work on during system installation and prior to tiling

High insulating properties due to its extruded polystyrene core giving tile or stone finish surfaces a warmer touch.

Extremely lightweight due to its rigid foam core benefitting installations over older structures and handling on construction sites.

Easy and clean to cut to size using a circular saw or handsaw.

Installation is extremely fast and safe due to the one piece shower base application. The product or installation requires no curing times allowing for a continuous installation process.

Drain covers are height adjustable for a perfect finish with the tile selected

No limitation to use of tile sizes or the type of tile

No limitation to use of cement based thinset mortars and grouts. Product works perfectly with polyurethane or epoxy based grouts.

Technical data

Technical properties - Fundo Primo

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 Primo 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
073735507	wedi Fundo Primo, square floor element, central drain, drain incl.	36 in. x 36 in.
073735505	wedi Fundo Primo, square floor element, central drain, drain incl.	48 in. x 48 in.
073735518	wedi Fundo Primo, square floor element, central drain, drain incl.	60 in. x 60 in.
073735524	wedi Fundo Primo, square floor element, central drain, drain incl.	72 in. x 72 in.
073735516	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	36 in. x 48 in.
073735506	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	36 in. x 60 in.
073735509	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	48 in. x 60 in.
073735508	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	48 in. x 72 in.
073735519	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	60 in. x 72 in.
073735522	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	48 in. x 84 in.
073735523	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	60 in. x 84 in.
073735525	wedi Fundo Primo, rectangular floor element, central drain, drain incl.	36 in. x 72 in.
073735521	wedi Fundo Primo, rectangular floor element, offset drain, drain incl.	36 in. x 72 in.
073735527	wedi Fundo Primo, rectangular floor element, center drain, drain incl.	42 in. x 60 in.
073735528	wedi Fundo Primo, rectangular floor element, center drain, drain incl.	42 in. x 72 in.