Overinsulating or underinsulating?
We have a home built in 1986 in Columbus, Ohio (Zone 5). We are replacing our siding due to hail damage and plan to have the following layers on our home:
2. 2×4 walls with unfaced batt fiberglass insulation (R?)
3. polyiso 1/2″? – (old, some gaps, foil faced, says “R3.6” on the face)
4. 3/8″ EPS w double foil face (~R1.5) – http://www.thermalbuildingconcepts.com/technical/propertySheet/ps-PhysicalPropertiesofThermal3Ht.pdf
6. Cedarmax insulated vinyl siding (R2.4) – http://www.proviaproducts.com/productdetail/vinyl-siding/cedarmax/
Does this sound like an ok plan? Ideas? Concerns?
For #4 we are also considering 1/2″ or 5/8″ — they only cost about $500-700 more.
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