I am working on a remodel where we are putting wood floors over a concrete foundation. We will need a hearth extension and I want to to keep it to code. I have found the size requirements, but I don't know the where the hearth ends and the hearth extension begins.
See the pictures. I have a pre-manufactured unit surrounded my masonry. The masonry sticks out 6 inches beyond the hearth of the premanufactured unit, then drops 12 inches to the floor where I need to add a hearth extension. When I calculate the requirements of my hearth extension, do I include the thickness of the masonry? Put another way, since my masonry extends 6 inches, can my tile extension be only 10in (to meet the 16 in requirement for my sized fireplace)?
![Where does my hearth end? Where does my hearth end?](https://www.hearth.com/talk/data/attachments/197/197793-7ea2ffb7c46f43b98f2731ed6ed7fda5.jpg)
What about when measuring for the 8in requirement? The following picture shows the front corner of the fireplace. The ceramic heart of the hearth is fronted by a metal trim that extends 3 inches on either side of the firebox. Do I start my 8in measurement from the ceramic tile or the metal corner?
Thank you,
Tony
See the pictures. I have a pre-manufactured unit surrounded my masonry. The masonry sticks out 6 inches beyond the hearth of the premanufactured unit, then drops 12 inches to the floor where I need to add a hearth extension. When I calculate the requirements of my hearth extension, do I include the thickness of the masonry? Put another way, since my masonry extends 6 inches, can my tile extension be only 10in (to meet the 16 in requirement for my sized fireplace)?
![Where does my hearth end? Where does my hearth end?](https://www.hearth.com/talk/data/attachments/197/197791-0519ed36a4ba3db3431b8846f56ecafa.jpg)
![Where does my hearth end? Where does my hearth end?](https://www.hearth.com/talk/data/attachments/197/197793-7ea2ffb7c46f43b98f2731ed6ed7fda5.jpg)
What about when measuring for the 8in requirement? The following picture shows the front corner of the fireplace. The ceramic heart of the hearth is fronted by a metal trim that extends 3 inches on either side of the firebox. Do I start my 8in measurement from the ceramic tile or the metal corner?
![Where does my hearth end? Where does my hearth end?](https://www.hearth.com/talk/data/attachments/197/197792-0a5a1d33d2971eaccdc059065d75dc9c.jpg)
Thank you,
Tony
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