Rectified tile refers to ceramic or porcelain tile that has been precision-cut after firing to achieve exact dimensions on all sides. This allows for very thin grout lines during installation — creating a smooth, seamless look.

    The Firing Process Creates Size Variances

    During the manufacturing process, all ceramic and porcelain tiles undergo firing in a high-heat kiln and then cooling. This inevitably leads to slight size variations between each tile, as the ingredients in the tile material react differently to the extreme temperatures. These size differences are typically minor, but they make a noticeable impact when you lay the tiles with very thin grout lines.


    Rectification Makes Tiles Precisely Uniform

    To create rectified tiles, manufacturers take the extra step of precision-cutting the tiles after initial firing. This involves cutting each tile to the same dimensions on all sides using diamond-blade saws. The edges are also ground to create near-perfect 90-degree angles.

    Compared side-by-side, rectified tiles will have no discernible size difference between individual tiles. The sides are also precisely square and flat, with only an extremely faint beveled edge along the top to prevent chipping.


    Enables Much Narrower Grout Lines

    The dimensional consistency achieved through rectification is what enables installers to use grout lines much narrower than the industry standard. Grout lines as thin as 1/16 inch are possible with rectified tile, whereas non-rectified tile requires a minimum of 1/8-inch grout lines to allow adjustments for size deviations.

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    Narrow grout lines create a sleek, continuous look to the tile installation as if the floor were one giant uninterrupted slab. Grout lines practically disappear to the eye. For this reason, rectified tile is best for achieving a modern, seamless aesthetic.


    Better Cleanability with Less Grime Buildup

    Another advantage of narrow grout lines is easier cleaning and maintenance of the tile floor. Standard-width grout lines tend to show dirt and discoloration relatively quickly as grime lodges inside. With less space between tiles, there are fewer grout joints for dirt, grease, and moisture to work into over time. The wider the grout line, the more pronounced and unsightly this buildup appears.

    With razor-thin grout lines, there is significantly less space for grime to accumulate. Keeping the grout lines clean and like-new-looking requires less elbow grease. Compare this to the effort involved in fixing hardwood floor scratches over time.


    Only Available in Large Format Tiles

    It is important to note that rectified tile is only produced in large format sizes, typically 12 inches square or larger. The extra processing would not be practical or cost-effective with small mosaic tiles.

    If you want a unique tile shape or intricate pattern, rectified tile is likely not an option. The technology works only with large, square, or rectangular tiles.


    Special Installation Factors to Consider

    Installing rectified tile is a more meticulous process than standard tile. Before deciding on rectified tile, keep these key installation factors in mind:

    Installation takes more time, care, and precision. Contractors typically charge a higher labor rate for rectified tile jobs.

    Not all installers have experience working with rectified tiles and ultra-thin grout lines. Verify your contractor is comfortable with the specialized techniques involved.

    The substrate or underlayment must be precisely level, as any uneven spots will be clearly visible and you cannot adjust it for with wide grout lines. Self-leveling compounds, backer board, or special thinset mortars help achieve the required flatness.

    Verify with the manufacturer that the “rectified” tile you choose truly adheres to industry standards for dimensional accuracy. Some tiles marketed as rectified do not hold to stringent requirements.


    Tile Types That Are Inherently Rectified

    Natural stone tiles, like marble, granite, and travertine, do not go through a firing and cooling process. These stones are precision-cut from large slabs, so they are inherently rectified with smooth sides and uniform sizing.

    Porcelain slab tile is also factory-cut to precise dimensions, so it is technically pre-rectified. If you want thin grout lines but prefer natural stone over ceramic, these materials offer pre-cut accuracy without the need for secondary processing. To learn more, see this overview of the different types of wood flooring.


    So, Is Rectified Tile Right for Your Project?

    Deciding whether to install rectified tile requires careful consideration of your design goals, budget, and expectations. Rectified tile achieves a spectacularly sleek, modern look — unlike any other flooring. However, it also comes at a higher price and demands greater installation precision.

    If you want an ultra-minimalist, seamless aesthetic and are willing to pay more, rectified tile is likely the right choice. For more traditional patterns with less emphasis on grout lines, standard ceramic tile may meet your needs at a lower cost. Consider how you will use and view the floor when deciding if rectified tile is a worthy investment.

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    FAQs About Rectified Tile

    What are the key differences between rectified and non-rectified tiles?

    The main difference is dimensional accuracy and consistency. Rectified tiles are precision-cut after initial firing to make them exactly uniform in size. Non-rectified tiles have minor size variations tile-to-tile right out of the kiln.


    What size grout lines can you use with rectified tile?

    Because rectified tiles are so dimensionally consistent, grout lines can be very narrow‌ — ‌as thin as 1/16 inch. With non-rectified tile, 1/8 inch is the thinnest recommended grout line.


    Is installation of rectified tile more difficult?

    Yes, installing rectified tile requires great precision and care to properly space the tiles and achieve flawlessly straight grout lines. The substrate must also be perfectly flat and level.


    Is rectified tile more expensive than regular tile?

    Rectified tile does cost more per square foot due to the extra processing and precision cutting involved. Installation labor costs are also typically higher.


    What finish options are available with rectified tiles?

    Rectified tiles can have polished, honed, or textured finishes, much like standard ceramic or porcelain tiles. Different finishes impact the visibility of the grout lines between tiles.


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    Jonathon Jachura

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    Jonathon Jachura is a two-time homeowner with hands-on experience with HVAC, gutters, plumbing, lawn care, pest control, and other aspects of owning a home. He is passionate about home maintenance and finding the best services. His main goal is to educate others with crisp, concise descriptions that any homeowner can use. Jon uses his strong technical background to create engaging, easy-to-read, and informative guides. He does most of his home and lawn projects himself but hires professional companies for the “big things.” He knows what goes into finding the best service providers and contractors. Jon studied mechanical engineering at Purdue University in Indiana and worked in the HVAC industry for 12 years. Between his various home improvement projects, he enjoys the outdoors, a good cup of coffee, and spending time with his family.

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