We are building a house 20 mi from Canada in Vermont. I have approx 1000 sq ft of 2" Thermax (isocyanurate) that was previously used on the ouside of the original structure which is concrete block. We have added another story and would like to reuse this 2" foam type insulation. This material has an aluminum facing on both sides. Is there any way I can safely used this product either between the studs in the 2x6 walls or in the cathedral ceiling?