I'm trying to place a Hearthstone Homestead, with 6" legs and bottom heat-shield, in front of an existing masonry fireplace. I have the hearth extension pad pretty much worked out (in my head), using Micore, cementboard, and slate, to get the required r-value of 2.5 out 18" in front of stove -- and raises pad-level 4" to match the existing fireplace hearth level.
The problem is, the front edge of the existing fireplace hearth is > a 4" level of brick (above floor-level) on top of 6" of concrete (below floor-level)< -- sitting on the wood floor-joists in basement below -- which, from what I read in HearthWiki, has an R-value of only 1.37. This would be directly under the belly of the stove. There's only 2" clearance in hearth above connecting stove-pipe to play with, and wondering the simplest way to fix the issue.
I'm wondering if I can place the stove on a (1/2"-?) plate-steel platform -- up 2", and out 8" each side...? When comparing the requirements of the two models of Homesteads -- the model with the 4" legs and no bottom heat-shield needing R-6.6 (!) , compared to the 6" legs w/heat-shield at R-2.5 -- a difference of more than R-2 per inch...
Wouldn't my putting essentially another steel baffle and 1.5" of airspace under the stove reduce the R-needed by a similar amount??
btw - HearthWiki lists 1" of "ventilated air-space" at R-1.43... but, does this mean only vertical airspace?
Thanks for any thoughts.
The problem is, the front edge of the existing fireplace hearth is > a 4" level of brick (above floor-level) on top of 6" of concrete (below floor-level)< -- sitting on the wood floor-joists in basement below -- which, from what I read in HearthWiki, has an R-value of only 1.37. This would be directly under the belly of the stove. There's only 2" clearance in hearth above connecting stove-pipe to play with, and wondering the simplest way to fix the issue.
I'm wondering if I can place the stove on a (1/2"-?) plate-steel platform -- up 2", and out 8" each side...? When comparing the requirements of the two models of Homesteads -- the model with the 4" legs and no bottom heat-shield needing R-6.6 (!) , compared to the 6" legs w/heat-shield at R-2.5 -- a difference of more than R-2 per inch...
Wouldn't my putting essentially another steel baffle and 1.5" of airspace under the stove reduce the R-needed by a similar amount??
btw - HearthWiki lists 1" of "ventilated air-space" at R-1.43... but, does this mean only vertical airspace?
Thanks for any thoughts.