42 Pa.C.S. 8332.4(a)(2)
Liability: Design Professional
When an emergency declaration is in effect, a design professional who, without compensation, provides professional services will not be held legally responsible for acting or failing to act. They can be held legally responsible when their conduct falls below the generally practiced standards of the professional services for such a situation or if their conduct was because of a recognized duty to another person and they were aware of the substantial risk of harm.
Volunteer-in-public-service Negligence Standard
(2) Except as provided otherwise in this section, no design professional who, without compensation and as a volunteer, provides professional services related to a declared national, State or local emergency caused by a major earthquake, hurricane, tornado, explosion, collapse or other similar disaster or catastrophic event at the request of or with the approval of a Federal, State or local public official, law enforcement official, public safety official or building inspection official acting in an official capacity shall be liable to any person for any civil damages as a result of any acts or omissions in rendering such services unless the conduct of such design professional falls substantially below the standards generally practiced and accepted in like circumstances by similar persons rendering such professional services and unless it is shown that such design professional did an act or omitted the doing of an act which such design professional was under a recognized duty to another to do, knowing or having reason to know that such act or omission created a substantial risk of actual harm to the person or property of another. It shall be insufficient to impose liability to establish only that the conduct of such design professional fell below ordinary standards of care.