What is the greenest insulation to use for walls and roofs?

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What is the best material to use for wall and roof insulation?

Babak K Published: July 12, 2020, 8:43 p.m.Last updated: Sept. 25, 2020, 8:55 a.m.

Can you share what material you'd recommend to use for wall and roof insulation? Least toxic, and highest R factor? Wool, Fiberglass etc. Do you have a brand in mind that you'd recommend?

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