Our project is located in Japan. We usually classify tiles and stones to porous materials in our country. Porous material is defined as follows according to SCAQMD Rule1168.

(59) POROUS MATERIAL is a substance which has tiny openings, often
microscopic, in which fluids may be absorbed or discharged. Such
materials include, but are not limited to, wood, fabric, paper, corrugated
paperboard, and plastic foam.

Which category, porous or non-porous, is appropriate for tiles and stones under LEED submittal?