The last earthly contact Siarhei Marhunou had with a construction material was with a 2 x 4 that was part of a protective guardrail on the balcony where he had been installing siding. The barrier had been erected by a prior contractor that worked at 2330 Sansom Street, a Philadelphia residence undergoing renovation, some time before Marhunou’s arrival at the job in December 2021. The guardrail apparently was too low to meet the federal standard for edge barriers where a ladder was in use and lacked a midrail, an expert witness for Marhunou’s widow reported in her negligence lawsuit against the companies on the project.