![]() ![]() Reach out to your manufacturer representative for assistance. The tile manufacturer can also assist in clarifying the first three items listed above. Refer to ANSI A137.1 for a chart that outlines acceptable lippage per tile type and tile size. What is the angle of natural or manufactured light?.Recommended spacing or separation of each tile module?.What is the allowable warpage of the tile module?.What is allowable thickness and variations of the tile modules?.This chart in the Field and Installation Requirements chapter in the TCNA Handbook, under Flatness and Lippage, is a guideline for identifying acceptable lippage, according to ANSI A137.1. Additionally, it is important that the tile contractor is aware of the following key elements prior to setting that first piece of tile: High or low spots on the wall will need to be corrected by the GC and drywall company or the tile contractor to ensure overall flatness prior to installing tile. The use of a 10’ straight edge will greatly assist the tile contractor in determining that flatness of the substrate. In order to achieve substrate flatness, the installer needs to have a rate of 1/4” for every 10’ of wall surface space from the required plane according to ANSI A108.02. This is the first step in avoiding undesired lippage. If addressed early in the planning phase, it prevents the need for correction and scrambling on the job site when the tile contractor is called in to work on finish details.Īfter the lighting position is correctly determined, the tile contractor needs to ensure that the substrate is flat. An RFI to the general contractor (GC) and architect sent prior to construction can address any changes that need to be made to position correct lighting in the space. Make sure that this factor is addressed early. Per TCNA standards, we recommend lighting be placed at a distance of 2’-0” off the wall to limit the dramatic effect of wall grazing. ![]() Most lighting is installed directly overhead or up against the wall. Think – if you will – of a restroom wall surface where lighting is required to illuminate an area above a sink. What does a tile contractor need to know about lighting and how it affects the perception of lippage?Ĭorrect lighting placement and making sure the substrate is flat are two key considerations to avoiding undesired lippage in wall tile installs.Īrchitects and designers utilize overhead lighting to enhance the tile on a wall surface or provide needed lighting for the interior space. In addition to the Flatness and Lippage section of the TCNA Handbook, the NTCA Reference Manual has excellent information on critical lighting situations and lighting placement on the appearance of lippage in wall tile installations. This causes the imperfections of the installation to be highlighted and will most certainly cause an installation failure and the architect and GM to reject your install. At this angle, any irregularity in a wall surface 1/32” or greater can cast a shadow. The phenomenon of critical light occurs when sunlight or another source of light strikes a wall surface at a 15º angle or less. When asked to write this article on critical lighting and how it can make or break the success of your installation I was posed with three important questions.īefore I get into the responses to these questions, let’s first define critical lighting and the issues that it presents to the tile installer. ![]() As the last trade in, improper installation of lighting and tile can have huge ramifications on the finished design and accepted install. Critical lighting, wash wall lighting, grazed lighting, pose a major make-or-break dilemma for the tile subcontractor if not addressed correctly. ![]()
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