I found some firebrick from Thermal Ceramics IFB nearby and am thinking of purchasing them for use in a pizza oven. My fear is that they are the wrong type of brick for use in the oven. They look like they might be good for the walls/dome/arch and not the floor. What are your thoughts

http://www.morganthermalceramics.com/media/4526/ifb-structural-range-1200-1430-data-sheet-english.pdf