About: http://webisa.webdatacommons.org/187839549

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Floor and Riser: Impervious materials, such as concrete, are believed to be most suitable for the floor and riser.
http://www.w3.org/ns/prov#wasQuotedFrom	fda.gov