Brian Knight wrote:...energy performance will be better with the higher R values in the wood frame minimums....
Brian Knight wrote:A dwelling that is "traditional-natural" that uses mainstream amounts of un-renewable energy to stay comfortable, does not adhere to permaculture principles to me.
Air-leakage and fenestration being equal, a stone, adobe or rammed earth wall will lose heat roughly 11X faster than a similar thickness R50 straw bale wall.
Brian Knight wrote:Most folks measure the performance of building envelopes by air leakage, insulation and fenestration.
Brian Knight wrote:What about thermal mass walls like cob, stone, rammed earth, and logs? As my quick statistic was meant to show, they can be a huge problem when we are trying to heat or cool a home or building. The only climates where thermal mass walls have been proven as effective as walls with insulation is where there is consistent, year-round temperature swings between day and night. While this can happen in all climates during certain times of the year, its very rare for a climate to experience this most of the year especially for the diurnal swings to bracket the 70 degree human comfort zone.