![]() 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. Or would it be easier to fill the valleys with drywall mud? If so, which type of mud would be best for this application? Are there any issues to consider, like cracking and water exposure? (There will be a sink under the window.Critical lighting, wash wall lighting, grazed lighting, pose a major make-or-break dilemma for the tile subcontractor if not addressed correctly. There are no upper cabinets on this wall, so I am wondering if it's possible to redo only the part of the wall that is above the level of the countertop? My inclination is to tear the wall down to the studs and redo it, but our cabinets have already been installed (though not the countertops). There is also a spot near the window trim where the wall appears to be built up too much, enough so that the tile could end up proud of the trim, which I'm pretty sure won't look so hot. If you put a 48" straight edge up against the most sunken areas, there's a gap of almost a 1/2". The area of the wall to be tiled (minus the area of the window) is 37 square feet. ![]() There's a window on this wall, which the sink is centered on. ![]() ![]() We're doing a kitchen remodel, and we're prepping to have a tile backsplash installed on one wall, from the countertop to the ceiling. ![]()
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