How Is an Exterior Wall Built Using Hardie Board?

Wall Plumb

• Before installing the Hardie board on top of the wall studs, you have to make sure that the wall is plumb. Any dips and valleys will show up in the final installation, exposing tiles that are higher or lower than others. Whether you use wall shims after the fact or do it right the first time, wall studs need to be plumb from top to bottom to serve as a board support.

Moisture Barrier

• A vapor barrier needs to be installed between the board and the wall studs to ensure that any condensation and moisture runs down the wall and onto the flange around the foundation. Sheet plastic tacked up on the studs is the best choice, with the board installed on top of this. Any extra condensation will run down the wall rather than seep into the home.

Waterproofing

• Once the Hardie board has been installed on the wall’s surface, waterproof the board to provide extra protection for the home behind the exterior wall. Use painted waterproofings that go on in liquid form or interlocking plastic membrane systems that get installed on top of the board. Your choice and budget are the determining factors in which type of waterproofing you use.

Tile Installation

• After all of the elements are in place, install your finish material onto the face of the now-protected Hardie board. It is still important to caulk the installation around all perimeters and seal the tile after it has been completed. Between the moisture barrier, the waterproofing, the durability of the tile and eventually a coat of sealer on top of the tile installation, your home is enhanced both value-wise and aesthetically.