The tendency of cork to expand and contract with humidity changes can be minimized by installing floating cork flooring, and by stabilizing the temperature and humidity in your house. Even so, installing cork floors in bathrooms or other areas with high moisture content should be avoided. However, if your choose to install cork flooring in a bathroom, the perimeter of the room should be caulked prior to installing the baseboards to avoid moisture penetration (or you can calk around the baseboards for the same reason).

To further minimize the impact of variables in the climate, the cork flooring must acclimate for 3-4 days prior to installation. To do this, simply remove the cork tile from its packaging and leave in the room where the floor will be installed. The room temperature should be between 60F and 70F with normal levels of humidity. If you live in a particularly dry climate, let the cork acclimate for several weeks to make sure it has dried and contracted as much as it's likely to so that you don't get shrinkage once it's installed.

Generally, cork can be installed over any sub-floor as long as it is smooth, level, clean, and dry. That means that any old paint, wax, grease, polish, and old adhesive must be removed to ensure a good bond.
   

Once the sub-floor is ready, layout your cork tiles, making sure that the color and pattern variations are scattered throughout your room. Before applying your water-based contact cement adhesive to the perimeter of the room using a paint brush, chalk your lines onto the sub-floor. Then, using a paint roller to apply the adhesive to the rest of the floor, paint directly over the chalk lines because the adhesive will dry clear. Allow to completely dry for about an hour until tacky before laying the cork tile.

Starting in one corner, align the first tile to the chalk line and the next tile tight to the edge of the first. The remaining tiles can be laid in the same fashion and if necessary, can be cut using a sharp utility or linoleum knife. To attain a positive contact between the tile and sub-floor, the tiles must be hit with a mallet or rolled with a standard tile roller four times in each direction.

Before applying a top coat of urethane or flooring wax to your tiled floor, remove any excess adhesive from the floor using a damp cloth, if the adhesive is wet, and mineral spirits if the adhesive is dry. Plus, the tiles and seams should be vacuumed and then cleaned with a sponge. Since many of the cork tiles already have finish on them when sold, this final top coat helps protect the adhesive from moisture working its way through the seams.

If you opt to install a floating floor, be sure to leave a 1/4-1/2 inch gap around the edges of the room, giving room for expansion when temperatures and humidity rise. Some cork floor companies expect you to put an expansion joint at each room change, not just at doorways; be sure to ask before you make your cork purchase what your cork floor company's policy is. Another interesting note is that you see maximum lengths of how much floating cork you lay before inserting an expansion joint; generally that number is much lower than is really necessary.

Let the finish dry for four hours before walking on the floor with socks and 24 hours before walking on the floor with shoes. Your installation is complete.