About: http://webisa.webdatacommons.org/281748962

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	Sheet metal, wood, styrofoam blocks, stone, and other materials can be formed and fastened to ledges to accomplish the desired angle.
http://www.w3.org/ns/prov#wasQuotedFrom	icwdm.org