Experts Corner

For many years design professionals have had to consider the Coefficient of Friction when specfying tile, particulalry for "wet" environments, including bathrooms, lobby areas, etc.  Those of you who have dealt with this enough times will remember that the commonly accepted, though technically not required, COF was 0.6.  What this author did not know was that the COF being referred to was the SCOF, or rather the Static Coefficient of Friction, which tested the resistance when the testing surfaces began the test stationary and then the "foot" surface was moved to evaluate slip resistance (the test was the ASTM C1028).  Effective January 2014 the Tile Council of North American (TCNA), has called for a new test, the DCOF AcuTest to be used to evaluate tile.  The "D" in the DCOF refers to "Dyanamic" and reflects an adjustment in the testing methodology for which the the "foot" surface will make contact with the surface being tested when the "foot" is already in motion.  The new number that we will all have to become accustomed to for "wet" environments is a DCOF AcuTest value of 0.42.

Rectified tiles continue to increase in popularity, particularly in the commercial arena. For years, the industry and Dal-Tile have recommended that Rectified tiles can be installed with a 1/16" grout joint. However, from the contractor’s perspective, installations have become more time consuming and difficult to ensure compliant installations when attempting to install a Rectified tile with a 1/16" grout joint. In response, the new TCNA (Tile Council of North America) Handbook addresses this issue by recommending that the width of the grout joint used be determined by the ANSI A108.02 specification which states that the actual grout joint size shall be at least 3 times the actual variation of facial dimensions of the tile. To simplify: Rectified tiles, regardless of size, shall have a grout joint width no less than 1/8". As a result, Dal-Tile is changing its recommended grout joint width to be 1/8" for all of its Rectified tiles.

Provided By : Jeff Eassa (jeff.eassa@daltile.com)

In the past several years there have been an increasing number of requests by building owners for more privacy in their public washrooms, especially in Class A and Trophy office buildings. Most manufacturers of toilet partitions can now offer stalls with no gaps between the components and taller doors and divider panels. These extended doors and divider panels reduce the gap at the floor to 6” and in some cases 4”.