Which is the best basement insulation?

Alex Kesheshian
Updated: Sept. 25, 2020

Building a new raised bungalow in Ontario. Basement will have 9' ceilings, 5 ' concrete wall and 4' knee wall built with 2x6 and batt insulation r22. Should I run rigid insulation inside the foundation wall up the concrete and cover the knee wall as well? If so what product makes the most sense?

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