Energy efficient design / Discussions

...energy efficient than a similar counter part that is less efficient would take longer to build? The difference in the time it would take to build an energy efficient Prefab Home compared to a code-built less efficient home would be negligable. Any company you want to work with should be able to give you a sense of time...

On the page of your site about dense packed cellulose walls  you show an exterior wall with 10" plate & sill and two rows of 2x4 studs. This looks fantastic, but the idea of vapour-permeable membranes on both sides makes me nervous in combination with cellulose. In Ottawa, temp can drop to -25 in winter and reach +...