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It's been awhile since I used it but DOE's website has a program called Res-Chek that does include several log options. The program let's you meet an overall performance target for the building. With log you might need to beef the insulation in the roof and play with the windows to pass. Yup, if there is infiltration it doesn't matter if there is insulation. It's hard to beat a draft.There is a table in ICC400-2007, the log home standard (iccsafe.org) that lists minimum average log width across the top of the table and specific gravity of the log up the side. The intersecting point is the r value of the wall, however the table has a stair stepped line diagonally across it that factors in the thermal mass, above the line the combination of R and mass is too light, below the line there is enough mass and R to pass.
Build 2 boxes of identical size and R value. One of typical insulated lightweight construction, the other of solid timbers. Put a thermostat in each set to the same comfort zone. Change the outside temperature 30 degrees. Which thermostat kicks on first?Set back the thermostat in both for the night. Which thermostat will go longer into the night without kicking on the heater?
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