24 Nov '11, 9pm

Is there a cumulative rvalue effect in ceiling + roof insulation? #green

If I have an r30, cold roofed, thermally isolated, conditioned attic (400sqf, rarely used living space for guests) and r30 ceiling insulation over the main 1000sqf living space, does that equate to r60 for the main living space under the ceiling? Both levels will have independent, monitor heating units. Both levels will have adequate mechanical ventilation and make up air inlets. In zone 6. I'm aware that this is not up to code but I'm curious. What are the pros and cons of this set up?

Full article: http://www.greenbuildingadvisor.com/community/forum/gener...

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