Chopernator said:So what is the "required" R value for the Progress Hybrid A.K.A Firestorm lol.
Because I have just finished my hearthpad lastnight well just about still have to do the grout 66" x 66".
My current R rating is .435 thats durrock, mortar and 1/4" tile. Anybody know? thanks.
If you haven't read the blog already, http://woodstocksoapstoneco.blogspot.com/ you can find the information on a material's R value there.
"Reduced R-value & front hearth clearances: Front hearth clearances can be reduced to 8â€, and the hearth R-value can be reduced to 0.40, with the installation of an optional 3.5†deep cast iron radiation shield/ash lip (outlined in red above). We had additional UL test conducted with the radiation shield in order to facilitate installations on hearths with R-values of 0.40 to 0.80 (typically 1/2†cementboard or equivalent, covered with 1/4†stone or tile). These hearths were recommended for decades by various manufacturers in the hearth industry. We are having these new shields cast on an expedited basis and expect to have them in approximately 3 weeks. We will post a picture of the design on Monday."