Waterproof tile underlayments are support placed between your subfloor, often plywood, and your tiles. Underlayments provide a level, rigid, water-stable or water-proof base, that’s better suited for tile to adhere to. Tiles set on top of underlayment should never crack, and should last for many years.
Types of Tile Underlayment for Floors
Cement Board: Water-stable and strong, cement boards are one of the least expensive options. It’s easy to tile aver, and fine for rooms that are not subject to excess moisture.
Waffle-Pattern Plastic Underlayment: Lightweight and waterproof, this plastic underlayment comes in rolls. it’s well adapted to absorbing shocks and blocking out moisture. This is a very good option for bathrooms, laundry rooms, kitchens, and basement floors.
Tile Underlayment for Walls
Drywall: If you are placing tiles on a wall in a dry area, you can simply apply the tiles directly onto either rimed or painted drywall. However, if the drywall is painted with glossy paint, you should lightly sand it so that the tile adhesive will stick to it. Make sure the walls are very clean and free of grease before you begin tiling.
However, tiling directly onto drywall is not recommended for wet areas like showers. If drywall is already installed around your shower or bathtub, you can apply a waterproofing membrane over the wall.
Foam Building Panels: If you are building a new home, or doing a deep remodeling of your bathroom, consider placing polystyrene foam panels over the wall studs. They’re lightweight and easy to install. It’s also waterproof, and easy to tile over.
