Choosing insulation for a high-performance home in Northern Vermont—where temperatures as I write hover around the zero mark—requires thought and care. The right choice can make a huge difference in both comfort and cost efficiency.I did my research and was leaning toward the most popular choice in our area—dense-packed cellulose—when I discovered Roxul (roxul.com), a new/old product by a Danish company. The material I can get locally is manufactured in Canada, and it's gaining popularity in this region—so much so that it's now carried here in one of the big-box stores.Rock Wool RevisitedAs the name implies, Roxul comes from rock...

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