Product Brochure

When installed over concrete, wedi Building Panels function as a crack-bridging underlayment, as cracks are not likely to
transfer through the polystyrene core. The polystyrene foam also acts as a water barrier, when the seams are properly
treated, making the system 100 % waterproof. The panels have excellent thermal insulation qualities, which is especially
beneficial when used under floor warming systems. The wedi Building Panel can help smooth out slightly uneven slabs
if appropriate mortars or wedi Building Panel thicknesses are used.
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Make sure the concrete floor is
fully cured and free of debris,
oil or waxes. Some concrete
floors might require priming or
vapor retarders prior to thinset
mortar installation.
The panels are installed in a
full coverage setting bed using
modified thinset mortar allow-
ing best connection between
subfloor and wedi Building
Panel.
03
Stagger all joints when laying
wedi Building Panels on the
floor. Apply some weights such
as tile boxes equally distributed
over the wedi Building Panel
surface and especially over
transitions.
Tape all joints with wedi fiber-
glass mesh tape in dry areas
or wedi Joint Sealant in wet
areas. Begin tiling once thinset
has cured below wedi Building
Panel.
wedi Building Panels over Concrete
Subfloor Installation
All wedi Building Panel sizes and thicknesses can be used as tile un-
derlayments over concrete subfloors. Modified thinset mortar, combed
through with a 3/16“ (4.8 mm) to 1/4“ (6.4 mm) square notch trowel,
will then provide a ribbed bed into which the wedi Building Panels
will be laid. All joints should be staggered so that no seam continues
throughout the length of the floor. Apply weights (i.e. tile boxes) onto
the surface and where transitions are located while the mortar is setting
up. After the mortar has set, wedi alkali resistant fiberglass mesh tape,
wedi Sealing Tape or wedi Joint Sealant should be applied to all seams,
then tiling can begin.
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wedi Building Panels over
Concrete Subfloors