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RE: GSBN:carbon sequestering

I would assume, as a first pass, that straw sequesters as much CO2 per unit
weight as does wood.  They are very similar in so many respects.  It is also
important to consider how much embodied energy straw has, BTW.

John Straube
Civil Engineering Dept and School of Architecture
University of Waterloo
T: 519 888 4015 		F: 519 888 6197

-----Original Message-----
From:	Ecobruce@...[mailto:Ecobruce@aol.com]
Sent:	Monday, November 20, 2000 5:16 PM
To:	bainbrid@usiu.edu; gsbn@...
Subject:	Re: GSBN:carbon sequestering

In a message dated 11/20/00 9:29:46 AM, bainbrid@...
(David Bainbridge) writes:

>Has anyone made a serious effort to calculate potential carbon
>sequestration in straw bale buildings?  This should include an offset
>if cement plasters are used --high energy demand.

I share David's curiosity about this.  But the offset from cement plasters
itself offset by the long-term carbonation of concreteTo what extent,
however, we don't know.

(Concrete, and cement plasters, and all cement-based constructions, capture
atmospheric carbon in the outer (exposed) inch or two of any surface over a
period of years.  This reaction is well known, and though some of the
ecologically-minded concrete guys I know have thought about this, no one to
my knowledge has tried to calculate how much carbon all the concrete in the
world has soaked up.  But it's a bunch, you bet.  Almost surely nowhere near
enough to make up for all the CO2 that was released in its manufacture, but
still, a bunch.)

 Bruce King
a bunch of near enough engineer