Chris Magwood wrote:
Thanks for the welcome to Permies! An amazing community that I'm just being introduced to...
In general, any kind of insulation works equally well in both directions... if it's keeping you warm in the winter, it will keep you cool in summer. However, applying basic passive solar design will help to ensure that the insulation can do its work. Be sure that south facing and west facing windows have adequate shading for the summertime, otherwise the solar heat gain through the windows will raise the interior temperature even if the wall and ceiling insulation are adequate.
It's always a good idea to build in cross-ventilation, with a low intake (could be a window or screen door) on the side that faces the predominant summer breeze, and a high exhaust (usually a window) on the leeward side. This will really help move air through the building, especially at night.
If you're building really small, we have used straw between a double stud wall, with both walls sheathed in wooden lath and the straw packed very firmly into the frame cavities. This was a great way to shave the wall width down to 12" instead of 16".
Chris Magwood wrote:Christopher,
A single 2x10 wouldn't be too narrow for this wall system, but it would create a lot of thermal bridging, as each stud would touch the outside and inside of the wall system. Better would be two 2x4 walls spaced to the same size as a 2x10... less wood, no thermal bridging.