Why Do Wooden Stairs Creak?

All things made of wood, furniture, stairs, and all parts of houses, keep changing size because wood expands with heat and contracts with the cold. Wood also swells when the air is moist, then shrinks when the air is dry.

So when you walk up stairs at night and you hear them creak, they probably have contracted from the cold, damp air.

About Karen Hill

Karen Hill is a freelance writer, editor, and columnist for zippyfacts.com. Born in New York, she loves interesting random facts from all over the world.