So my wife and I are building a new home in Anchorage, AK and it should be done next month. The house is 2200 sq ft, is an open design, and is 5-star energy rated. We've settled on two stoves, the Woodstock progress hybrid or the Jotul F-500 Osolo. My wife loves the looks of the Jotul but loves the features of the PH. She's not a big fan of the looks of the PH so it looks like we're going with the Jotul. Now that we've settled on a stove I want to get the hearth pad built but this will be the first stove we've ever bought. Right now where the stove is going there is carpet. I know the size of the pad to build but I'm not sure about a few things. Do I need to remove the carpet from under the pad? I've been reading around that using Durock as an insulator is a good idea and cheap. We'd then cover it with some sort of slate or tile. Any advice you guys can give us would be very helpful. Finally, the stove will be placed along an outside wall in the middle of the house. The builders put in the metalbestos and flashing so all we have to do it hook up the stove pipe to it. The ceiling in this area is two stories and vaulted so we have about 25ft from floor to ceiling. I've been told I should use double walled pipe for this run to maintain the heat and help the draft. Does anyone know the best place to get double walled pipe?