Ask the Experts – January 2016
I have a small tile job at the TIA (Tampa International Airport). The general contractor (GC) is directing us to start the work with temporary lighting that is not very good. We have asked that they place either the permanent lighting or temporary light “representative” of the permanent lighting so that we can see exactly the conditions for the installation.
I could have sworn that I read something at some point with regard to tile being installed in the lighting in which it is to be used.Can you help me with some type of literature on this item?
Thank you for contacting the National Tile Contractors Association. I am happy to provide you with some information to help you respond to your GC regarding the installation of tile under poor temporary lighting conditions that are likely not representative of the permanent lighting.
We are not aware of a requirement for the GC to install the permanent lighting before tile work commences. However, you are correct to be concerned about the location of permanent lighting and its potential effect on viewing the finished surface of the tile installation. The angle of natural or manufactured light on finished tile work may cause an acceptable installation to have an unacceptable appearance.
While there is no specific method that addresses installation of lighting, the 2015 edition of the TCNA Handbook includes a statement about various types of lighting and their effect on wall and floor tile installations. When proper backing surfaces, installation materials, installation methods, location of light sources and certain lighting techniques are not carefully coordinated, shadows and undesirable effects may be apparent on finished ceramic tile installations.
The 2015/2016 edition of the NTCA Reference Manual includes an extensive discussion of critical lighting effects on tile installations. This discussion is found in Chapter 5, “Special Installation Procedures,” and addresses many problems along with tips and preventive measures tile contractors can take or recommend before the installation begins. Also included is a series of photographs that boldly illustrate the effect lighting can sometimes have on a tile installation.
The success of your particular installation will depend on a variety of factors such as: flatness of the substrate (which will have a profound effect on the flatness of the finished tile surface); the type of tile being installed; the pattern the tile will be installed in; the inherent warpage of the tile; the grout joint width; any out-of-tolerance lippage of the finished tile installation, etc.
As required by ANSI, we encourage you to construct a mockup of the area to be tiled and illuminate it with an accurate representation of the permanent lighting installation. Have the GC or architect review the mockup and accept it in writing before beginning the tile installation.
If you are a member of the NTCA, please review pages 139 – 144 of the NTCA Reference Manual. There you should find all the information you need, including a sample letter you will be able to reformat as your own company’s formal communication to the GC and/or the owner.
If you are not a member of the NTCA, please visit our website at www.tile-assn.com or contact me and I will be happy to assist with your application.
– Mark Heinlein, NTCA Technical Trainer