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Kerdi-Board is a waterproof tile substrate: an extruded polystyrene foam core with reinforcing layers and fleece webbing on both faces that bonds to thin-set mortar. It serves as both backer and bonded waterproofing membrane, so showers and tub surrounds can be built without separate cement board plus a liquid or sheet membrane. It is lightweight and cuts with a utility knife, which makes it faster to install than cement backer board. The trade-off is cost and the need for Schluter's matching thin-set, banding and seals to keep the assembly warrantied.
In stock
Lowest price we've seen: $112.00 on Nov 11 at The Home Depot. Tracked across 1 store since Nov 11.
Installers and remodelers describe Kerdi-Board as a fast, clean way to build a waterproof shower, praising its light weight and easy cutting. Complaints center on the higher cost and on the care needed to protect the foam edges and joints.
Kerdi-Board is a multifunctional tile substrate and building panel. It is used to create bonded waterproofing assemblies with tile coverings.
The panel is made of extruded polystyrene foam. It has a special reinforcement material on both sides, along with fleece webbing that anchors it in thin-set mortar.
It can be used in a variety of interior applications, including showers and bathtub surrounds.
