Measure the height of the border.
Wallpaper border chair rail height.
Allow it to expand by applying paste to the back if it is un pasted or by soaking it in water for 10 seconds if pre pasted.
About 28 to 32 inches is an optimum range for chair rail height says hull.
For example if the room already has wallpaper on the lower half with a wallpaper border currently defining the edge it s easiest to install the chair rail where the wallpaper currently stops.
Hull cautions that most people install chair rails too high on their walls.
The ornate chair rail with a thickness dimension at eye level height would add a surprising and dramatic design element to the room.
This would look like a typical wallpaper border in order to bring detail with a new and updated form.
If you re going to be hanging a border as a chair rail use a level and draw a light pencil line around the room at the right height.
All the moisture to soak into the paper border for 5 minutes before measuring the height of the border from top to bottom.
Using the width of the border as a guide prime the wall or surface area where you plan to install the border.
Consider how different chair rail heights look next to those features.
For me a good rule of thumb is to install chair rail molding at 25 of the height of the room.
Plan your starting point so that if there is a mismatched seam it ll fall in an inconspicuous place.
Lower is always better than higher.