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FREQUENTLY ASKED QUESTIONS ON wedi BUILDING PANELS & wedi FUNDO SHOWER SYSTEMS



WEDI BUILDING PANELS


What is the wedi building panel?

What is it made of?

Who produces it?

Why is the wedi Building Panel waterproof as opposed to “water resistant” backerboards?

What sizes are available?

How much do the wedi building panels weigh?

Does the wedi building panel have an R-Value?

Does the wedi building panel have a fire rating?

Does the wedi Building Panel have sound deadening qualities?

Are wedi Building Panel or any of wedi’s foam based products “green “ products?

Can it be used on floors?

On the floor should I leave room for expansion joints between wedi Building Panels?

Should I stagger my joints?

Can the wedi Building Panel be installed on walls?

Can I install the wedi Building Panel directly to the studs?

Can I install the wedi Building Panel over green board/drywall?

Can I install wedi Building Panel in a steam shower or steam room?

Can I install wedi Building Panel in a Dry Heat Sauna?

Can I install wedi Building Panel in and around Fireplace applications?

Can I install wedi in a swimming pool?

Can I install wedi building panels in conventional concrete or pan liner shower floor installations?

Can I use the wedi Building Panel in an exterior application?

Can I install benches or countertops out of wedi 2” thick panels and do I have to treat the blue foam edge(s) prior to tiling?

How is the wedi Building Panel cut?

Do the seams in an installation have to be taped?

Is the wedi Building Panel strong enough for my ceramic tile installation?

In wet areas does one have to use the wedi Waterproof Sealing Tape or wedi Joint Sealant?

Do I have to use reinforcing tape/ mesh tape, when wedi joint sealant is used to cover and seal wedi building panel joints?

Does the additional installation of wedi sealing tape over seams, treated with wedi joint sealant, add any benefit?

How is the joint tape applied?

The wedi Building Panel can be dented when pressure is applied, will this cause problems after ceramic tile is adhered over these dents?

Is the wedi Building Panel's foam toxic?

How do I make tile repairs on wedi building panel installations?

The wedi Building Panel is more expensive than the other tile backerboards. Why should I use this product?


WEDI SHOWER SYSTEMS / BASES


What is the wedi Fundo Shower Pan?

Which wedi Fundo Shower Pan sizes are available?

Can I cut the wedi Fundo Shower Pan to size?

Can I extend the wedi Fundo Shower Pans?

Do local building codes allow the wedi Fundo Shower Pan system to be used instead of a conventional shower pan liner and mortar bed construction?

How much time does it take to install the wedi Fundo Shower Pan?

wedi Fundo Shower Bases are installed in thinset mortar suitable for a substrate. Can I use wedi Joint Sealant instead?

Why is a wedi Fundo Shower Pan installation less expensive than traditional shower pan liner-mortar bed construction?

Which ceramic tile sizes can be used with the wedi Fundo Shower Pan?

Why is the wedi Fundo Shower Pan so much safer than a conventional concrete shower pan?

Can I use the wedi Fundo Shower Pan with any other ceramic tile backerboard other than the wedi building panel?

Can I use the wedi Fundo shower pan with floated wall installations instead of wedi building panel?

How do I instruct the plumber to setup the drain system before installing the wedi Fundo Shower Pan and pressure fit drain assembly?

What is the height of the wedi Fundo Shower Pan?

Do I need to use the black plastic riser piece in wedi Fundo’s Drain Parts Box?

Do I have to glue or screw the drain cover and its frame to the wedi shower base?

Do I have to glue or screw the drain cover and its frame to the wedi shower base?



FAQ



WEDI BUILDING PANELS


What is the wedi building panel?

The wedi Building Panel is a waterproof tile underlayment for walls and floors, manufactured by wedi GmbH in Emsdetten, Germany. It consists of an extruded, polystyrene core and is covered in a fiberglass mesh and polymer modified cement resin coating.
The blue foam core is closed cell, extruded polystyrene that does not allow the transfer of water and retards water vapor transmission.
The alkali resistant glass mesh adds strength and rigidity to the building panels. The cement coating allows for adhesion as a bonding surface to any standard or modified tile adhesive on cement or epoxy basis. The board is engineered to be used in interior applications for the installation of ceramic tile on walls, floors , countertops and many more applications where traditional backerboards are used.
The wedi Building Panel is available in 2'x 4 ', 3'x 5' , 2'x 8', 3’ x 8’, 4’ x 8’ sheets in various thicknesses 1/8", 1/4", 1/2", 5/8", 1", 1 1/2" and 2".


What is it made of?

The wedi Building Panel is made up of three components: foam, mesh, and mortar. The blue foam is extruded polystyrene (Styrofoam). It is inherently waterproof as it provides a closed cell matrix.
This is due to the process under which the foam is created. The foam is extruded under enormous pressure, creating a dense mass of tiny, closed cells so tightly packed together that water cannot penetrate the insulation, nor can the insulating air escape from the cells.
The single foam cells share the surrounding cell foam walls with the neighbor cells so that no room is left open in between the single cells in the matrix. The foam is then covered with a glass mesh to add strength and rigidity, which in turn is coated with a polymer-modified cement coating.




Who produces it?

It is manufactured in Emsdetten, Germany by wedi GmbH, which has been producing the Building Panels since 1982.




Why is the wedi Building Panel waterproof as opposed to “water resistant” backerboards?

The wedi Building Panel is 100% waterproof because of the material it is made of For example, the foam used to make a standard white coffee cup is highly compressed expanded Styrofoam However, compressed foam will allow for liquid to move around the units of which it is made. The foam that wedi Building Panels consist of is extruded foam; this means that the foam is created through a process of infusing a styrene resin with a blowing agent. It is a single piece of foam with air pockets within.
The extruded polystyrene core is different than more common compressed expanded Styrofoam. With this EPS foam, little balls of foam are compressed tightly together to hinder the passage of liquid through the independent pieces of foam. This is why a liquid stain can often be found beneath a Styrofoam cup sitting on a cold granite countertop after it has allowed vapor transfer created by hot coffee or tea. This results in a foam matrix that is honeycomb in nature. The extrusion process creates foam that is closed cell; it lacks voids through which water could migrate. It has zero capillarity and cannot wick water.



What sizes are available?

The wedi Building Panel is available in 2'x 4 ', 3'x 5' , 2'x 8', 3’ x 8’, 4’ x 8’ sheets in various thicknesses 1/8", 1/4", 1/2", 5/8", 1", 1 1/2" and 2".



How much do the wedi building panels weigh?

The wedi Building Panels vary in weight depending upon the thickness of the board. In the 3 x 5 ft. size 1/4" is 8.07 lb, 1/2" is 8.67 lb, 5/8" is 8.97 lb and the 1" is 11.4 lb.




Does the wedi building panel have an R-Value?

Yes. The R-value varies depending upon building panel thickness at a rate of 4.3 per one (1) inch.




Does the wedi building panel have a fire rating?

The wedi Building Panel will not provide a thermal or fire barrier. It will not add anything to a fire, as the cells of the foam will collapse due to extreme temperatures above 175°F. Where a one-hour firewall is required, the wedi building panel should be applied over a surface that can provide such a rating ( such as certain drywall systems).




Does the wedi Building Panel have sound deadening qualities?

The wedi Building Panel is not engineered to be used as a sound deadening underlayment. It will lower airborne sound but, due to its firm and full surface contact bond to substrate and tile, will not reduce impact sound.



Are wedi Building Panel or any of wedi’s foam based products “green “ products?

Conventionally, “green products” are fully organic and sustainable. wedi foam based products are thererfore not “green”. However, the process of manufacturing is engineered to not harm our environment. Extrusion agents used are CFC free and the product obtained a “Global Warming Potential “ rating as per UN charts of 1 . Global-warming potential (GWP) is a relative measure of how much heat a greenhouse gas traps in the atmosphere. It compares the amount of heat trapped by a certain mass of the gas in question to the amount of heat trapped by a similar mass of carbon dioxide. A GWP is calculated over a specific time interval, commonly 20, 100 or 500 years. GWP is expressed as a factor of carbon dioxide (whose GWP is standardized to 1). For example, the 20 year GWP of methane is 72, which means that if the same mass of methane and carbon dioxide were introduced into the atmosphere, that methane will trap 72 times more heat than the carbon dioxide over the next 20 years.The substances subject to restrictions under the Kyoto protocol either are rapidly increasing their concentrations in Earth's atmosphere or have a large GWP.
wedi foam based products also protect organic structural parts of buildings such as wooden parts against rotting , replacement and mold, thereby axtively prolonging the lifetime of an installation, resulting in a savings of resources and energy.
In addition, wedi foam based products add insulation and can eliminate heat leaks of building envelopes insulation and help conserving energy. Wedi building panel can also be used actively on facades to add to the efficiency of older insulated walls or standard Batts insulation. Especially also in areas often subject to insufficient insulation and heat loss such as window or door frame areas.




Can it be used on floors?

Minimum 1/8” thick wedi Building Panel functions as an excellent substrate for most flooring applications. wedi Building Panel has been rated for heavy-duty commercial use by the Tile Council of North America (TCNA) using the industry standard known as the Robinson Floor Test.
It can be applied over a wooden or concrete subfloor. When applied over plywood, the recommended joist spacing is 16" on center, 5/8" or greater plywood with no deflection in the subfloor greater than L/360 as outlined by the TCNA, following local building codes or the IRC. If applied over a cement subfloor the slab should be fully cured and free of debris. The board will function as a crack bridging membrane because cracks in the cement subfloor will not transfer through the foam as easily as through other inelastic tile backerboards.




On the floor should I leave room for expansion joints between wedi Building Panels?

No, the wedi Building Panel is inert and will not shrink or expand over time. All wedi Building Panels should be butted together. An expansion joint around the perimeter of the floor should beconsidered, leaving a gap of 1/8" to the surrounding walls to better resist structural movement.
Consider the use of expansion joints in your tile assembly over wedi products according to Recommendations found in the Tile Council of North America’s Handbook for Ceramic Tile Installation



Should I stagger my joints?

Yes, the wedi Building Panels should be staggered to minimize the length of breaks in the substrate.




Can the wedi Building Panel be installed on walls?

The wedi Building Panel can be applied directly to wood or metal studs, over gypsum board (green board or drywall), masonry walls and existing ceramic tile. The recommended thickness for a wall application is 1/2", 5/8", or 1".
The particular thickness is dependent solely upon the desired effect that the contractor wants to achieve. If a contractor is applying wedi Building Panels over a gypsum product, the 1/2" board will most likely be used as this will allow for the trim pieces of ceramic tile to cap where the wedi Building Panels end.




Can I install the wedi Building Panel directly to the studs?

Yes, minimum ½” thick wedi Building Panels can be fastened directly to wood or metal studs with only a few fasteners per sheet {one (1) wedi Fastener per one (1) ft. of stud}. When the board is applied directly to studs the 5/8" material can be used if the ceramic tile to be applied will have a flush or surface finish. The 1" board can be applied directly to studs if a "floated" look is desired or over 19” o.c. framework. The framework itself must be designed as a loadbearing , suitable substrate.




Can I install the wedi Building Panel over green board/drywall?

Because the wedi Building Panel is 100% waterproof, it is not necessary to use green board/drywall behind the installation. However, it is common for this material to be applied in wet areas and it has no detrimental effects on the installation if waterproofed with the wedi Building Panel. Before installing wedi Building Panel over any gypsum containing product, a primer must be applied prior to application of thinset mortar which is used to attach the wedi to such drywall assembly.
Can I use the wedi Building Panel in an exterior application? The wedi Building Panel is not recommended for use in a horizontal exterior application. On a vertical surface, the wedi Building Panel can be used in certain instances. Please contact wedi Technical Service when planning this type of installation.



Can I install wedi Building Panel in a steam shower or steam room?

Yes, wedi is the preferred choice of Backerboard worldwide for more than 29 years when it comes to steam rooms. wedi panels are not only waterproof but also function as a vapor retarder. A 1 inch wedi Building Panel meets the current industry standard for required vapor barriers in steam rooms ( PERM rating 1 or less when measured under ASTM E96, Test Method E). However, wedi does not support the current industry standards nor accepts the suitability of the Test method applied. wedi does not determine any product with a positive PERM (permeability) rating as a barrier but only as a retarder. wedi therefore recommends the application of the wedi VAPOR BARRIER AEA VBC 500 over its product in steam applications. This will ensure the decades of safe functionality of a steam room application. This liquid applied barrier must not be confused with common waterproof membranes which will not act as a standalone protection in steam rooms. wedi diligently works in technical committees of NTCA and TCNA to change the industry standards to increase the required strength of a vapor retarder and/or barrier in steam room installations. wedi building panels also provide a thermal insulation value , minimizing the water vapor pressure differential to the outside area behind the wall and ceiling substrate and adds to energy efficiency through insulating the warmth in steam rooms. Please see wedi’s full guidelines for residential and commercial steam rooms on this website in the technical data sheet “wedi Building Panel”




Can I install wedi Building Panel in a Dry Heat Sauna?

No, wedi Building Panels should not be installed in areas subject to temperatures above 175*F. The foam could deform in such installations and applied tile could heat up to a point, where users could get hurt.




Can I install wedi Building Panel in and around Fireplace applications?

This would depend on how close the wedi building panel will be located to the heat. wedi Building Panels should not be installed in areas subject to temperatures above 175*F




Can I install wedi in a swimming pool?

With the assumption of perfectly installed seams in a wedi Building panel assembly, wedi could be used in pools. wedi Building panels are 100% waterproof. Due to high water pressure in large pools and the inevitable high number of seams and other protrusions ( lights/fixtures), we recommend to install the wedi Vapor Barrier AEA-VBC-500 over such surfaces.




Can I install wedi building panels in conventional concrete or pan liner shower floor installations?

Yes, unlike with cement based backer boards, you can actually install the wedi building panels all the way down to the pan liner, before you float a concrete base against them. The result is a square, plumb installation ready for tile. wedi building panels, unlike cement backerboards, do not wick water



Can I use the wedi Building Panel in an exterior application?

The wedi Building Panel is not recommended for use in a horizontal exterior application. Please contact wedi Technical Service when planning this type of installationOn a vertical surface, the wedi Building Panel can be used in certain instances such as facades. Please consult wedi for proper installation in different climate zones of North America. On facades, please integrate wedi building panel into the building envelope considering that wedi Building Panel functions as an insulator and also vapor retarder. Its proper positioning in an exterior wall assembly is therefore depending on the climate zone in which the installation is done.




Can I install benches or countertops out of wedi 2” thick panels and do I have to treat the blue foam edge(s) prior to tiling?

Yes, benches and seats and many more installations such as these can be installed without framework needed. These panels can be cut and fitted together, using wedi joint sealant. When a blue , exposed, foam edge remains , such as at the front of a wedi 2” panel used as a countertop, a strip of wedi panel, 2” wide, can be glued to this edge and will restore a cemt resin coated “wedi panel surface” prior to setting tile.



How is the wedi Building Panel cut?

The wedi Building Panel is cut with a utility knife, scoring is unnecessary as the blade will be able to penetrate through the board. Mechanical saws and handsaws can also be used.




Do the seams in an installation have to be tape?

Yes, all seams should be taped with an alkali resistant fiberglass mesh tape or wedi sealing tape, using modified thinset mortar to provide a continuous bonding surface. In wet areas wedi Waterproof Sealing Tape or wedi Joint Sealant must be applied. If the sealant is used, no glass mesh tape is needed in addition. The joint sealant is designed to be adhesive and flexible joint sealant in one application when installed according to wedi’s guidelines.




Is the wedi Building Panel strong enough for my ceramic tile installation?

The wedi Building Panel has been rated for heavy-duty commercial use by the Tile Council of North America (TCNA). This means that wedi Building Panels can serve as an underlayment on floors in a residential application such as kitchen or living room floors, in bathrooms or stairways, as well as spaces such as office buildings, breweries or anywhere that there is heavy duty use. When installed on walls, wedi Building Panels can support any standard ceramic tile or natural stone (up to 23 pounds / sqft) . On ceilings, it can bear up to 18 pounds/sqft. The board will not fail under normal conditions, including moderate impact, such as the weight of an adult person or the blow of a wayward refrigerator.



In wet areas does one have to use the wedi Waterproof Sealing Tape or wedi Joint Sealant?

In wet areas wedi Waterproof Sealing Tape or alternatively wedi Joint Sealant must be applied. Regular silicone caulks must not be used, as mortar will not bond to silicone and these may provide a food source for bacterial growth and many such products cannot live up to the expected lifetime performance of a shower installation.




Do I have to use reinforcing tape/ mesh tape, when wedi joint sealant is used to cover and seal wedi building panel joints?

No, a mesh tape would not add any strength to such installation. Quite to the contrary, it would form water brif=dges inside and throughout such wedi joint sealant application.




Does the additional installation of wedi sealing tape over seams, treated with wedi joint sealant, add any benefit?

No, sealing tapes are installed in cement based thinset. Thinset can , under water pressure, allow water migration underneath such tape. This will not happen to the application of wedi joijnt sealant. In addition, in case of movement, a thinset mortar applied tape will also not add any strengths to a wedi joint sealant treated seam. Under extreme movement conditions, it is the weakest link or the most inflexible link in an assembly that would break or fail. The thinset mortar application incorporating a sealing tape would break first and with it, render the sealing tape useless. The wedi joint sealant alone, if applied as required is not only stopping water migration, is also stronger and more flexible than the combination of any sealing tape applied in thinset mortar.




How is the joint tape applied?

All joint tapes should be applied using modified thinset mortar.




The wedi Building Panel can be dented when pressure is applied, will this cause problems after ceramic tile is adhered over these dents?

No, once the cells in the foam are broken they will not reinflate. When thinset mortar is spread over these indentations the voids are filled and will set as such. As long as the wedi Building Panel is not punctured all the way through the foam, the waterproof qualities of the board will remain. In situations where this is unavoidable (such as at the attachment points where nails or screws are used) wedi wedi Joint Sealant must be applied.




Is the wedi Building Panel's foam toxic?

No, the foam is inert and inorganic. It will not produce carcinogens when handled or cut. It is produced utilizing a CFC-free blowing agent. All wedi foam products have a certified global warming impact of 1 ( no negative impact)





How do I make tile repairs on wedi building panel installations ?

When taking off tile from wedi building panel installations, please cut grout and tile carefully before you utilize a strong putty knive to take off tile and mortar chips. Please be careful when cutting , that you don’t cut all the wau through the wedi panel as it would compromise your waterproofing. Please refrain from using hammers or other tools that expose the building panel assembly to vibration and impact pressure. This could cause seam sealing and reinforcement to open up and would put your waterproofed application art risjk. In the event, that you tear out a full piece of wedi building panel from your wall assembly, please cut out the whole panel in the area and size of your tile. Use a utility knive with an extended blade so you are able to cut this piece out with 45 Degree mitered edges. Cut a replacement wedi panel piece with mirrored 45 Degree mitered edges and insert the piece into your cut out in the wall after a bead of wedi joint sealant has been applied all around the contact seams for this replacement panel. Carefully seal over the (typically ) 4 seams with more wedi joint sealant and spread flat with a putty knive. Before applying the sealant, you might want to tape surrounding tile as not to get any sealant onto the good tile. Let the wedi joint sealant cure for 30 minutes. Now back butter a new tile and press it firmly on the repaired wedi building panel, keying the til in with a downward push first and move the tile up while pressing the tile firmly into position. Regrout the area.




The wedi Building Panel is more expensive than the other tile backerboards. Why should I use this product?

In comparing square foot pricing, the wedi Building Panel is more expensive than cement backerboards and fiber-cement boards. However, in comparing value, wedi Building Panel saves extensive labor, provides a waterproof substrate, is less likely to create an environment for mold, is a crack suppressor and weighs 75% less than the other products mentioned. Total job costs are reduced when using wedi Building Panel. Time of installation is faster and easier because it is lightweight, cuts with a utility knife and needs only 1 fastener per square foot. The end result is a waterproof surface.
To achieve a waterproof substrate with cement backerboard or fiber-cement board, a waterproof membrane must be used. The membrane installation costs almost as much as the wedi Building Panels.



WEDI SHOWER SYSTEMS / BASES



What is the wedi Fundo Shower Pan?

The wedi Fundo Shower Pan is a prefabricated, tile ready pan that is installed on a wooden or concrete subfloor using latex modified thinset mortar (1/2" thick). It does not require a shower pan liner underneath the system nor any waterproofing on top. It is already presloped and includes a pressure fitting drain system with no weep holes necessary. It is made of extruded polystyrene foam and is 100% waterproof.




Which wedi Fundo Shower Pan sizes are available?

The wedi Fundo Shower Pan comes in 3'x 3', 3'x 4', 3'x 5',3’ x 6’ (center drain), 3'x 6' (offset drain), 4'x 4', 4'x 5', 4'x 6', 4' x 7', 5'x 5', 5'x 6' ; 6’ x 6 ‘and 5'x 7' sizes. These are the standard sizes which are equipped with a 4” x 4” stainless steel drain cover. In Addition , more sizes are available featuring longer or shorter linear drain cover assemblies ( Fundo Riolito and Fundo Riofino) .


Can I cut the wedi Fundo Shower Pan to size?

Yes, using a circular or table saw, the wedi Fundo Shower Pan can be cut to size. The drain is centered so in order to maintain a proper slope layout, the pan should be cut equally on at least two sides. The 1/2" x 1/2" channel along the pan's perimeter always needs to be remade so that the 1/2" wedi Building Panels will fit properly.


Can I extend the wedi Fundo Shower Pans?

Yes, using wedi Fundo Presloped Extension Panels. These panels always need to be connected to the wedi Fundo Shower Pan using a shiplap notch which is prefabricated into the extension panels. When panels are cut, the shiplap connection has to me remade into the panel. wedi Joint Sealant must be applied inside the shiplap joint and an additional bead is applied on top of the joints (use a putty knife to smooth the sealant over the joints).


Do local building codes allow the wedi Fundo Shower Pan system to be used instead of a conventional shower pan liner and mortar bed construction?

Yes, your inspection department will recognize: the wedi Fundo Shower Pan system is, throughout, rated as waterproof as per ANSI 118.10 ( tested using ASTM D4068; 48 hrs standing water exposure) and is certified with IAMPO (File # 4953) and therefore meets all UPC and IPC requirements.


How much time does it take to install the wedi Fundo Shower Pan?

A standard size installation, for instance 3' x 5', takes approximately 30 minutes to install. The wedi Fundo Shower Pan is tile ready after being installed on a wooden or concrete subfloor.


wedi Fundo Shower Bases are installed in thinset mortar suitable for a substrate. Can I use wedi Joint Sealant instead?

No, please use a full surface setting bed of thinset mortar when installing. This will ensure, that no floor imperfections or voids under the base could possibly produce vibrations ( transferring into tile and leading to cracks) or hollow space sounds ( annoying to owners).


Why is a wedi Fundo Shower Pan installation less expensive than traditional shower pan liner-mortar bed construction?

If done properly, the traditional method includes a pre slope, shower pan liner and mortar bed, which easily takes 8 man hours to install, compared to approximately 30 minutes for the wedi Fundo Shower Pan. Depending upon the mortar bed thickness, 2-3 days drying time is often required before installing ceramic tile. The wedi Fundo Shower Pan is tile ready immediately after installation.


Which ceramic tile sizes can be used with the wedi Fundo Shower Pan?

2" x 2" or larger sizes can be installed with modified thinset mortar and cementitious grout. All ceramic tiles less than 2" should be grouted with an epoxy joint filler compound. For commercial applications or where wheelchair use is expected, please contact wedi Technical Service for the appropriate tile formats and setting material recommendations.


Why is the wedi Fundo Shower Pan so much safer than a conventional concrete shower pan?

The only way to safely install a conventional concrete shower pan is to apply waterproofing on top of the pan (though liquid membranes on concrete bases often crack). However, a preslope is typically installed underneath the shower pan bed and pan liner, which allows water to run towards the weep hole drain. This process is unpredictable and water may simply remain sitting in the porous concrete bed due to clogged weep holes and cause mold growth. Mortar bed shower pans often fail since the pan liner is sandwiched between the layers of concrete which can result in tears that cannot be seen or easily repaired (tears often occur especially where the pan liner is tightly installed over the curb and applied in a multi-corner fashion). Another concern is the watertight installation of the pan liner toward the drain flange. Since the pan liner is nailed directly to the studs, leaks can occur where the fasteners penetrate it. Larger pan liner assemblies have to be silicone together, same as for corner pieces. These seams are subjects to constant water pressure and may tear apart during floor movement or simply when mortar beds initially dry out upon installation and therefore shrink. The wedi Fundo Shower Pan does not absorb any water like concrete and completely protects any substrates from water exposure.


Can I use the wedi Fundo Shower Pan with any other ceramic tile backerboard other than the wedi Building Panel?

We do not recommend it and here is why: The wedi Fundo Shower Pan is part of a complete system offering a complete warranty. With traditional backerboards, Building codes require a vapor retarder behind the boards to connect into a pan liner or to a hot mop to protect the shower floor/wall including the curb. Such a waterproofing method installed “behind” or “under” the tile substrate must be applied throughout floor, wall and sometimes ceiling because the waterproofing products/layer have to connect to contain water. A pan liner under a wedi shower base, however, is not feasible. Therefore, a vapor barrier behind another backerboard ( example cement board) cannot be connected to the floor waterproofing. Although a pan liner is not needed underneath the wedi Fundo Shower Pan, waterproofing is necessary in order to meet the 4"- 6" wall requirement that the traditional shower floor liners are subjected to in traditional code books. This is, in the wedi system , done by using the waterproof wedi Building Panel with all seams being sealed with wedi Joint Sealant in between the board joints and the channel connection of the wedi Fundo Shower Pan, Building Panels and Curb. One option to use another board is, however, that this board would receive a topical waterproofing (instead of a vapor barrier/poly sheet behind) such as a sheet membrane or liquid membrane. Such membrane would have to be sealed and overlap onto all wedi shower floor components enough to create a secure connection. The warranty for such installation falls to the manufacturer of the product that failed.


Can I use the wedi Fundo shower pan with floated wall installations instead of wedi building panel?

We do not recommend it and here is why: The wedi Fundo Shower Pan is part of a complete system offering a complete warranty. With traditional floated walls, Building codes require a vapor retarder behind the lath to connect into a pan liner or to a hot mop to protect the shower floor/wall including the curb. Such a waterproofing method installed “behind” or “under” the tile substrate must be applied throughout floor, wall and sometimes ceiling because the waterproofing products/layer have to connect to contain water. A pan liner under a wedi shower base, however, is not feasible. Therefore, a vapor barrier behind another backerboard ( example cement board) cannot be connected to the floor waterproofing. Although a pan liner is not needed underneath the wedi Fundo Shower Pan, waterproofing is necessary in order to meet the 4"- 6" wall requirement that the traditional shower floor liners are subjected to in traditional code books. This is, in the wedi system , done by using the waterproof wedi Building Panel with all seams being sealed with wedi Joint Sealant in between the board joints and the channel connection of the wedi Fundo Shower Pan, Building Panels and Curb. One option to use a floated wall is, however, that this wall would receive a topical waterproofing (instead of a vapor barrier/poly sheet behind) such as a sheet membrane or liquid membrane. Such membrane would have to be sealed and overlap onto all wedi shower floor components enough to create a secure connection. The warranty for such installation falls to the manufacturer of the product that failed.


How do I instruct the plumber to setup the drain system before installing the wedi Fundo Shower Pan and pressure fit drain assembly?

A 2" Schedule 40 ABS or PVC pipe (per ASTM standards) needs to be installed where the drain is located. The 2" pipe is cut flush to the surface of the subfloor. The trap is securely mounted underneath the subfloor so that the pipe and trap can carry water without moving. A hole 5" in diameter must then be cut around the 2" pipe to allow for installation of the wedi Fundo Shower Pan-drain assembly. The plumbercould also install a 2" pipe after the wedi installation if access is available from below. If a Cast Iron or Copper drain is existing, please contact wedi for a fitting sealing gasket which we will provide.


What is the height of the wedi Fundo Shower Pan?

The height at the exterior edge is between 1 1/2" and 2” , depending on size of the system.


Do I need to use the black plastic riser piece in wedi Fundo’s Drain Parts Box?

No, this piece is optional and only used f the tile is extremely thick ( i.e. ¾” thick slab). In such case, you might want to cut this riser piece to the right height and insert it under the Drain Cover frame/cover.


Do I have to glue or screw the drain cover and its frame to the wedi shower base?

No, please just insert the square frame into the round drain opening and then insert the drain cover plate. The system will be grouted into its place. The grout joint between frame and first tile may be filled with a flexible caulk material. However, thinset mortar must be present underneath such caulking. Otherwise, a dam against water flow could build up and the shower needed longer to dry out.


Can I substitute wedi joint sealant with another sealant product?

No, wedi joint sealant is a proprietary product, engineered for durability and waterproofing while maintaining flexibility for the lifetime of a wedi installation.