​ ​ The Chimney Clinic is home of all chimney inspection and cleaning concerns, along with all chimney repairs and chimney relining.

Use of Forms

11.3.1.2 - Wooden forms used during construction of the hearth and hearth extension shall be removed when construction is complete.

Minimum Thickness

11.3.2 - The Minimum thickness of the hearth extension shall be 2".

Extension Clearances

11.3.3 - If the fireplace opening is less than 6' the hearth extension shall extend as follows:

     (1) At least 16" in front of the facing material.

     (2) At least 8" beyond each side of the fireplace opening.

11.3.4 - Where the fireplace is 6' or larger, the extension shall extend as follows:

     (1) At least 20"in front of the facing material.

     (2) At least 12" beyond each side of the fireplace opening.

Elevated Hearth

11.3.5 - Where a fireplace is elevated above or overhangs a floor, the hearth extension also shall extend over the area under the fireplace.

Hearth Support

11.3.1.1- Support for the hearth shall be provided by a structural slab or corralled brickwork.

Hearth Extension Material Types

11.3.1 - Masonry Fireplaces shall have hearth extension of brick, concrete, stone, tile, or other approved non combustible material wholly supported by and integral with in the chimney structure, and minimum 4" clearance shall be maintained directly below the underside.

Hearth Extensions

sub-section 11.3

NFPA fire code 211 quick links