XPS vs. polyisocyanurate
I am currently redoing the exterior of my house with a new vinyl siding and changing all windows. My house was built in the mid 80’s and have 2×6 studs with Batt Insulation and mostly without a vapor barrier… but the insulation is not great, especially the air goes through the house.
My question is what is the best insulation for me to put outside the house underneath the vinyl siding. My windows will allow me to go up to 1 inches of exterior insulation.
So XPS with Typar? Polyisocyanurate (IKO Ener Air )? Others?
IKO Ener Air (polyisocyanurate) (http://www.iko.com/products/thermal-insulation/iko-ener-air/#)
I would like to know what is the best thing I should use.
I live in a Zone 4a-4b.
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