What is the minimum thickness of a non-combustible thimble used in a chimney?

The minimum thickness of a non-combustible thimble used in a chimney is 5/8 inch. This specification is essential to ensure safety and efficiency in fireplace and chimney installations. A thimble serves as a fire-protective barrier that helps prevent any heat transfer to combustible materials surrounding the chimney, thus reducing the risk of fire hazards.

Having a thickness of 5/8 inch provides adequate structural integrity while allowing for the necessary insulation and heat resistance. It is crucial to adhere to established standards for chimney and fireplace components to ensure proper functioning, compliance with regulations, and the safety of the installation.