![]() Knowing which ones work appropriately is critical to the success or failure of the project. Floor Underlayment Preparation Materials.The six underlayment products listed above fall into three categories: Likewise, wall surfaces need to be properly prepared to eliminate potential issues. If the floor surface, be it wood or concrete, is not flattened or leveled to meet industry requirements and standards prior to starting the installation, chances are high that problems will be encountered. Does it need to slope to a drain or perimeter edge?.Are there low spots that need to be addressed?.The product chosen depends on what issues are identified upon examining the subfloor or substrate of the installation. How does an installer fix the floor, so it is flat enough to receive tile?Īlthough there's no tile industry definition for the category of “underlayment,” this grouping easily includes products such as: Getting the substrate to within these tolerances becomes a dilemma with today's large format tile sizes. 6 m) from the required plane when measured from the high points in the surface. (0.38m) or longer, the maximum allowable variation is no more than 1/8 in. (1.6 mm in 0.3 m) from the required plane, when measured from the high points in the surface.įor tiles with at least one edge 15 in. (0.38m), the maximum allowable variation is no more than ¼ in. Today, for tiles with all edges shorter than 15 in. This was a time-consuming method and, many times, not that effective in creating a flat floor especially given the ANSI Specification A108.02-4.1.4.3.1, Subfloor Surfaces: Perhaps using multiple layers of plywood until the low spot disappeared and one of the early generation floor patch products to fill in the remaining spaces. Installers in those days needed to be creative in fixing low spots, especially in a wood subfloor. ![]() The term “lippage” was rarely used if it even existed. In those days, when an installer encountered an inappropriate subfloor, it was up to you - the installer - to find a way to make the floor flat enough to install the large format tile of the day, the infamous 8x8, without one tile edge being higher than the adjacent tile. In the past, floor preparation materials were not as readily available as they are today. Floor Underlayments Preparation Materialsįinal Note: Beware of Using Thin Set to Cut Costs What Constitutes an Underlayment for Tile?Ģ. Tile Underlayment Guide Table of Contents ![]() ![]() The key element here is the foundation of the installation and that's where underlayment for tile solves a multitude of problems. For a beautiful and long-lasting tile installation, you need to ensure that every facet of the job is completed properly according to tile industry standards and best practices. ![]()
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