[Greenbuilding] embodied energy was Polyiso strength on roof (ErgoDesk)

[Alan Abrams]

>
> < I would guess new trusses as being the least material / lowest cost /
> highest benefit / integrity. Moisture conditions in the attic would be a
> concern – from experience I can say that venting with wet winter air is not
> effective. Cellulose fill is moisture tolerant but that is not the same as
> moisture cycling.>
>

I assume it would follow to make the ceiling a vapor barrier--no cans,
fans; sealed junction boxes, etc. (Smart membrane behind sheet rock?)

Another way to frame this is: are the moisture problems you are finding
associated with exfiltration from the interior, or from ambient conditions?

AA
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