HydroBlok Waterproof Shower Systems

HydroBlok is a durable, lightweight, high-density, extruded polystyrene foam building material. This customizable, completely waterproof system is ideal for showers, tub surrounds, outside, and beyond.


The HydroBlok components are sold separately so that you can choose materials specific to your installation. We'll help you calculate out exactly what you need for your project.


You won't need concrete wall boards or special setting materials for this system. Simply insure that your floor is level, set the shower pan with regular thinset mortar, screw the HydroBlok wall boards into place, and caulk every seam with the watertight polyurethane caulking. The HydroBlok products are easy to cut and work with; you could have an entire shower surround installed and ready to tile in a few hours!


Live in Alaska? We can ship a waterproofing kit to you! Click here for more information.

Foam? How durable is it really?

Hydro Blok US distributor Brian Wright stands on a piece of Hydro Blok Wall Board.
HydroBlok US distributor Brian Wright stands on a piece of HydroBlok Wall Board.

Hydroblok is made from Extruded Polystyrene, which is a high-density foam product, much stronger than styrofoam. As a closed-cell foam, it won't allow moisture or vapor penetration. HydroBlok products are reinforced with a coating of fiberglass mesh and cement for added strength and durability.

What's the difference between HydroBlok and other waterproofing systems?

How it's Waterproof

Other waterproofing systems rely on a waterproof coating. If you scratch or dent surface of other waterproofers, you have to reseal all damaged spots. HydroBlok's polystyrene core is completely waterproof, and it's concrete coating allows for a better tile bond. Even if you scratch off the coating or score the panels, they do not lose their watertight nature.


HydroBlok is rated for floor use in a commercial setting. That means that it's denser and stronger than other foam materials and can withstand as much weight as a standard cementboard or backerboard. 

Hydro Blok shower system with individual components

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