https://www.sfgate.com/bayarea/article/SAN-FRANCISCO-Firefighting-tradition-also-saves-2584568.php https://www.sfgate.com/bayarea/article/SAN-FRANCISCO-Firefig.

https://www.sfgate.com/bayarea/article/SAN-FRANCISCO-Firefighting-tradition-also-saves-2584568.php https://www.sfgate.com/bayarea/article/SAN-FRANCISCO-Firefig... "[wood ladders] don't conduct electricity like aluminum or wet fiberglass ladders do." "'Aluminum or fiberglass, when it gets too hot, it gets soft; it will actually fold over without any warning,' he said. 'Wood takes hours to fail completely -- enough time for a firefighter to see it burning and get off it.'" "Once an aluminum or fiberglass ladder cracks, it usually has to be replaced. Wooden ones can always be repaired, he said."