It depends on the tile size and the look you want. Read this: How large should grout lines be?
Previous post: Should I use grout or caulk in the corners of my shower?
Next post: Do I need a waterproof membrane for my shower walls?
The Floor Elf
Help with all your tile needs (and extreme jackassery!)
Click here to get an instruction manual for your waterproofing installation
Click Above to have professional TileTips sent directly to your inbox.