Can you tile over existing tiles, or does the existing tile need to be removed?

You can tile over existing tiles in some situations, but removal is usually the better long-term choice. Whether tiling over existing tile works depends on the condition of the current installation, the substrate, and where you're tiling.

When tiling over existing tile might work, the current tiles must be firmly bonded with no loose, cracked, or hollow-sounding pieces. The surface needs to be clean, level, and properly prepared with a bonding primer designed for tile-to-tile applications. This approach can save time and reduce demolition mess, but it raises the floor height and may create transitions issues with adjacent rooms or fixtures.

However, removal is typically recommended because it allows you to inspect and address the waterproofing membrane underneath - crucial in Ottawa's climate where freeze-thaw cycles can exploit any moisture penetration. Old tile installations may lack proper waterproofing by today's standards, and you'll want to upgrade to current best practices. Removal also lets you check for any substrate damage, plumbing issues, or structural concerns that need attention.

In Ottawa bathrooms specifically, most renovation projects benefit from full tile removal because it allows for proper waterproof membrane installation, substrate repair, and ensures the new installation meets current Ontario Building Code requirements. The additional height from tiling over existing tile can also create problems with door clearances, toilet flanges, and vanity installations.

For the best results, have the existing tile condition assessed by a licensed contractor. They can determine if the substrate is suitable and whether the added thickness will create functional problems. A proper tile installation with updated waterproofing will last decades and protect your investment.

For a professional assessment of your tile project, request a quote from Ottawa Bathrooms to ensure your renovation meets current standards and building code requirements.

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