what not use stones? there's more thermal mass in stones than wood. And stones don't shrink.
I've never really seen the appeal of cordwood, though I've never lived in a place where we could just cut trees for building homes...
A Western red cedar log has an R value of 1.25 per inch....
However, wood is an anisotropic material with respect to heat flow. That means its thermal resistance depends on the direction of heat flow relative to the wood grain. While wood has a commonly quoted R-value of about 1.25 per inch (depending on the species and moisture content), that only applies if the heat flow is perpendicular to the grain, such as occurs in common wood frame construction. With cordwood/stackwall construction, the direction of heat flow is parallel to the grain. For this configuration, the R-value is only about 40% of that perpendicular to the grain. Thus, the actual R-value of wood, when used in cordwood/stackwall construction is closer to about 0.50 per inch.
Although cordwood homes have been tested in -40F locations like Alberta, their thermal efficiency in any climate is below that of a purely cob house of comparable dimensions.
Cordwood done properly seams to work well and last a long time.
Thanx for providing the mix info as my books are buried.I have lived in a concrete building and it was impossible to heat.The logs are structuraly important in that they connect the inside layer of mortar to the outside layer and allow for the sawdust insulation in the middle which is the key to making the walls good heat holders.I believe quick growing second growth cedar would be best as it has more trapped air.Im almost done with a sauna made out of old growth cedar because I like the smell and the resins are rot resistant but because the grain is so tight there is less air trapped in the log which makes it less insulative.
Mt.goat wrote:Cob wood black locust coming up.The roof is metal and 20` x 20` and represents the biggest cost.Natural building has a lot of hidden costs too like wear and tear on vehicles and bodies.