Hi All - I'm going to be installing a Woodstock Soapstone Keystone in front of an existing masonry fireplace. Unfortunately the hearth isn't deep enough - only 18", and I need it to be more like 20.
So, my plan is to build a platform in front of the hearth that is flush with the surface of the hearth. The front legs of the stove will sit on the platform, rear ones on the hearth. Additionally, the platform will provide the necessary side and front clearances.
I'm thinking that I'll make the platform out of 2x10s, tile the sides to make it look nice and set a slab of 2" thick sandstone on top (I found someone on craigslist selling old sidewalk slabs),
The manual says I need an R value of .59 for a hearth pad. The info I found about sandstone online gives it an R value of .08 for a 1" thickness. So...
- I'm not sure how R value math works. Does that mean a 2" thickness would have an R value of .16?
- Presumably that means I need something between it and anything combustible. Any recommendations? Hardie backer? Cement board?
So, my plan is to build a platform in front of the hearth that is flush with the surface of the hearth. The front legs of the stove will sit on the platform, rear ones on the hearth. Additionally, the platform will provide the necessary side and front clearances.
I'm thinking that I'll make the platform out of 2x10s, tile the sides to make it look nice and set a slab of 2" thick sandstone on top (I found someone on craigslist selling old sidewalk slabs),
The manual says I need an R value of .59 for a hearth pad. The info I found about sandstone online gives it an R value of .08 for a 1" thickness. So...
- I'm not sure how R value math works. Does that mean a 2" thickness would have an R value of .16?
- Presumably that means I need something between it and anything combustible. Any recommendations? Hardie backer? Cement board?