r value with a jotul f100? HELP NEEDED!?!

[wkies]

HELP! I've been going back and forth with a mason and the Jotul dealer and I need some clarification, advice, and/or direction. I am planning to purchase (down payment is in) a Jotul F100. I have all the manufacture's clearances met on all sides of the stove for the hearth pad and wall clearence. I want to have a single piece of bluestone as the hearth pad just sitting on the existing floor. The manufacture does not call for any R value just "any non-combustible material with the use of the bottom heat shield". Here is where the confusion is: I'm being told that I need to put down wonderboard and sheet metal because the heat from the stove can be transfer to the floor.

I am aware that the heat will transfer through stone when subjected to high temps but is this going to happen with this stove? Isn't the idea that the bottom heat shield will prevent high temps directed to the stone. Any and all thoughts are welcome.

Thanks for the advice.

 

[fossil]

...The manufacture does not call for any R value just "any non-combustible material with the use of the bottom heat shield"...

Seems to me that says it all, so long as your stove is going to be fitted with the bottom heat shield. I don't understand why those folks are telling you something different. Rick

 

[CarbonNeutral]

If ember protection only is needed (like my F500), you are fine (assuming the rock covers the entire required hearth area). If you did need something extra, the mason is still wrong - a single sheet of wonderboard plus metal isn't going to do much to increase the r-value by much - 1/2" durock is about 0.2, the metal, unless there was an air gap, would contribute next to nothing. Your stone has very little r-value either. Stoves that require an r-value hearth typically need 0.5 and higher.


(broken link removed to http://chimneysweeponline.com/horvalue.htm) (for the r-values)

 

[SmokingAndPoking]

When a manual states that the floor protection must only be non-combustible there is no required R-value. They are required to state an R-value if one is needed, so you are in the clear by using the bluestone you had planned.

 

[wkies]

The Jotul manual states “any non-combustible material with the use of the bottom heat shield”. Here is a link to the manual.

(broken link removed to http://www.jotul.com/FileArchive/Technical) Documentation/Wood Stoves/Jøtul F 100 Nordic QT/Manual_F_100_USA_P03_090608.pdf

I have to make a decision by Monday. Any thoughts?

 

[fossil]

Thoughts haven't changed. If you're getting the bottom heat shield on your stove, then the manual says it all. Noncombustible, period. End of story. Just make sure that the hearth material you choose extends out at least as far in all directions as specified by the manufacturer. Rick

 

[firefighterjake]

HELP! I've been going back and forth with a mason and the Jotul dealer and I need some clarification, advice, and/or direction. I am planning to purchase (down payment is in) a Jotul F100. I have all the manufacture's clearances met on all sides of the stove for the hearth pad and wall clearence. I want to have a single piece of bluestone as the hearth pad just sitting on the existing floor. The manufacture does not call for any R value just "any non-combustible material with the use of the bottom heat shield". Here is where the confusion is: I'm being told that I need to put down wonderboard and sheet metal because the heat from the stove can be transfer to the floor.

I am aware that the heat will transfer through stone when subjected to high temps but is this going to happen with this stove? Isn't the idea that the bottom heat shield will prevent high temps directed to the stone. Any and all thoughts are welcome.

Thanks for the advice.

If all you need per the manufacturer is ember protection, the bluestone should be fine . . . UNLESS . . . and here's the big unless . . . unless the authority having jurisdiction (i.e. local Fire Inspector or Insurance Agent for example) states that you need some sort of additional protection. Here in the Big City, the Inspector routinely requires additional floor protection -- typically suggesting a 1/2 sheet of listed Durock. From the sound of it the issue you are having is with the mason . . . who may not realize that many of the modern stoves use features built into the stove to minimize radiated heat at the base.