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- Make sure the substrate is VERY smooth and level. Ideally, you want to use good SLC before putting down that large tiles.
- Getting 100% coverage of the adhesive is very important when working with large tiles, even more so than usual, as the tiles will crack easily if there are any hollows beneath them.
- If possible, use cement based adhesive of a "floating" flex variety. It's more liquid than normal cement based adhesive, so it's easier to get good coverage with it, and the type is often optimized for heavy wear and large tiles.
- Use large a large u-notch trowel, round-notch trowel, or Euro-notch trowel (I prefer euro-notch) for best possible coverage.
- Not working past the open-time of the adhesive is even more important than usual
- Make sure to check the levels often with a spirit-level, as any diffs will be quite noticable.
- Make sure to have movement joints every 10sqm or so
- Don't do brick-bond on (relatively) fresh concrete with this large tiles. If there is shrinkage in the concrete, there is a larger chance of tiles cracking, instead of just the joints, if you lay it in brick bond. Same goes for most other non-grid patterns.
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