The Waldo Place girl sustained a leg injury with no fractures after the falling 2-by-2-foot piece hit her just before 2:30 p.m., Deputy Police Chief Gregory Halstead said.
She was taken for treatment and evaluation at nearby Englewood Hospital and Medical Center, he said.
Englewood firefighters responded along with police.
A Building Department representative "determined that the structure of the house was not compromised and that it was safe for the occupants to remain," the deputy chief said.
Click here to follow Daily Voice Lyndhurst and receive free news updates.