Discuss What size T spacers for metro style tiles (10cm x 20cm) in the DIY Tiling Forum area at TilersForums.com.
I'd say 99% of metro jobs done by professional or diy get the tiles butted up in the internal corners same as any other internal tile corner and siliconed after.
Reply to What size T spacers for metro style tiles (10cm x 20cm) in the DIY Tiling Forum area at TilersForums.com