The 7% smaller house

So you’re going to build an already-small superinsulated “pretty good house” (look it up).  And you’re thinking of doing double-stud walls.  Just remember that the extra 6″ or so adds up.  It’s on both sides of the house, so it reduces the usable space by 1 foot in each dimension — x and y.

Let’s say you are building a boring rectangle that is 24×32 (inside dimensions).  Well, that’s a 768 sqft.  If you had instead built 25×33 (with single stud walls) then that is 825  sqft interior.  In other words, you are giving up 57 square feet with your insulation.  And that’s 7% of 825.  So your house is now 7% smaller!!!  Just be aware.

Instead you could do:

1) larsen truss

2) 4″ of polyiso added to the outside.

These are probably both harder than double-stud walls, I am just commenting that you should compare apples-to-apples — same interior square feet — when comparing options for how to build.

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