Originally Posted by BayoustateBBQ
Well I just added the thermo blanket to see what it did. I doubled it making it an r value of 4 to 8. I'm now sitting at 250 12" from the fire box and 214 12" from the chimney. The thermo blanket is coming off, it's not meant for that long. I sure hate to have to order from longhorn and wait freaking 3-4 weeks for a "non stock" item term heat
Keep in mind I used to be 250 by the chimney and 350+ by the fire box.(note to self: nickle holding up as dollar)
Fire rated calk might work with a sheet metal cover and bottom.