Write the next sentence in this paragraph:

How to install ceramic wall tile
Make sure your wall is ready to go.
Once you've removed the current wall dressings and wall items, like light switch covers, you'll want to check the base layer that you will be building on to make sure that it is structurally sound. This is important, since a rotting or weak wall can cause your tiling job to warp, crack, or even break and fall down.

OPT: I. Look for signs of mold or damage to the tiling surface. Cracks are often a sign that a wall may be weak and need to be replaced. II. Check to make sure the downspouts you added will match the look of the wall. Check the bottom clay walls to look for turbo thermostat vents. III. If you can't get a basic base sheet, you can install your own. Install the 2-foot-by 2-foot wall tiles onto the 80 inch wall. IV. Measure the base layer from top to bottom. The number of tiles you need to add to the top of your wall will influence your final performance.
I.