About: http://webisa.webdatacommons.org/435415237

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	If your new hatch spans more than 2 joists (involving cutting more than two joists) you will need to contact a specialist such as a structural engineer to ensure that no structural integrity will be lost.
http://www.w3.org/ns/prov#wasQuotedFrom	diydoctor.org.uk