For a DIY tiling project, you oughta know how to install cement board.

The Spruce / Liz Moskowitz

What Is Cement Board?

Cement boards are thin sheets formed from cement and reinforcing fibers.

Yellow electric drill installing cement board

The Spruce / Liz Moskowitz

Cement board is most commonly sold in 3 x 5-foot sheets with thicknesses ranging from 1/4 to 5/8 inch.

Larger, 4 x 8-foot panels are also available, but their weight is difficult for DIYers to maneuver.

Thicknesses vary based on how it’s being used:

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Cement board score cuts made with utility knife

The Spruce / Liz Moskowitz

Add a decoupling membrane to prevent concrete cracks from transferring to the tile.

Cut the Cement Board

Cement boards can be cut with a utility knife and a T-square.

Standard screws and drywall joint tape will corrode or deteriorate from contact with the cement board.

Thin-set mortar dry powder scooped with measuring cup to mix with water in white bucket

The Spruce / Liz Moskowitz

It is screwed directly into the wall studs.

Never install cement boards directly over drywall or green boards in wet areas.

For wet areas, you may want to call tile installers.

First cement board sheet fastened with cement board screws with yellow electric drill

The Spruce / Liz Moskowitz

Always screw down cement board using special cement board screws.

The screws are coated steel to resist corrosion.

The grooves are specially made to dig into the cement board.

Cement board joints offset with mesh joint tape

The Spruce / Liz Moskowitz

Pre-drilling is always recommended before attaching the screws.

It doesn’t matter what side faces outward or if you hang the boards horizontally or vertically.

Cement board joints covered with thin-set mortar by drywall knife

The Spruce / Liz Moskowitz