GBlist: RE: superinsulation for Vaulted Roof

["Sigi Koko" <sigikoko@earthlink.net>]

Why not use strawbale on the roof as well?  It's true you typically need a
redundant sheathing system for this, but that's true for SIP's too.
(structural insulated panels have 2 layers of plywood.)  Please feel free to
contact me off-list if you are interested in further details.  I also would
recommend a living roof, as this further reduced heat loss and heat gain
through your roofing membrane.

Sigi Koko

DOWN TO EARTH
Natural Building Design + Construction
Environmental Consulting

703/243-5030
sigikoko@earthlink.net
http://home.earthlink.net/~sigikoko/
1527 N. Stafford Street, Arlington VA  22207

original message:

I am looking for suggestions for insulation system for the roof which
provides an equivalent to R-45 insulation I am hoping for from the strawbale
walls.  The great room will be vaulted ceiling with exposed trusses.  The
roof material is corrugated metal or standing seam.  I am expecting to use
rigid insulation, so not too disimilar to SIP's, except constructed on site.

I am concerned about using rigid insulation because of the toxic fumes if
burned.  This house is in a high fire risk area in northern California.  I
would also like to use the most sustainable material for the insulation
without creating an outrageously thick roof.

Any body use anything lately that is also easy to work with?
Any help is much appreciated.

Barbara Linn

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