How to Attach HardiePlank to Walls

Preparation

• 1

  Calculate how much siding you need by multiplying the height by the width of each surface, deducting for areas that won't be covered such as doors and windows. Add 10 to 15 percent for waste.

• 2

  Remove or repair any rotting wood siding, lose boards and other problem areas that will either obstruct your installation or damage the structure if left unattended under the new siding.

• 3

  Wrap the structure in home wrap. A tightly wrapped building is better protected from the elements and increases energy efficiency. Flash around all windows, doors and vents. Install the trim molding at the corners and around windows and doors.

Installation

• 4

  Find the lowest point at which you will start. Most siding manufacturers will offer a suggested lowest point, but make sure you allow for covering old siding by checking all the way around the structure before you start. Mark the lowest point with the chalk line.

• 5

  Using the nail gun, install a starter strip along the length of the bottom. You can make one by cutting a one inch strip of siding. The starter strip will push the bottom of the lowest run out, making it uniform with the higher runs. Beginning with the starter strip and continuing for the entire installation, make sure the nails are in the studs and are penetrating at least 3/4 inch into the frame.

• 6

  Install the siding beginning with the bottom run by nailing it to the wall so the bottom overhangs the starter strip by about 1/4 inch. Place the nails 1 inch from the top of the run, so they are covered by the next piece of siding. Use the chalk line or level on every run to ensure a level installation. Allow for expansion by leaving about a 1/32 inch gap at both ends of the run. Avoid seams if possible. If seams are necessary, place an additional 4 by 4 inch piece of home wrap behind the seam to help protect against moisture.

• 7

  Caulk the seams and ends with paintable caulk. If the siding is prepainted, most manufacturers sell color-matched caulk. Do not caulk the underside of the runs as this can trap moisture.