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[Cob] Hybrid Strawbale/Cobpaul dotpaul at paulleblanc.net
Tue Feb 20 19:37:14 PST 2007
----- Original Message ----- From: "Shody Ryon" <qi4u at yahoo.com> To: <coblist at deatech.com> Sent: Tuesday, February 20, 2007 1:58 PM Subject: Re: [Cob] Hybrid Strawbale/Cob > Hi, > I have not built a cob or SB house, but if I did I > think I would install a lot of insulation such as SB, > vermiculite, perlite or.? With straw, or any organic > material, moisture mitigation from precipitation and > condensation should be addressed. Shody, does the insulation go on the *outside* (only) of a thermal mass wall? I believe so. I think insulation on the *inside* defeats the purpose of the way the mass moves the heat in and out of itself into the living space. I've heard of people that stacked straw bales up against the outside of the walls. I don't know how they kept them dry. And as you mentioned (snipped) a long, narrow dwelling with all the glass on the south side (and shaded in summer by that black cloth or vines) maximises the collection of the day time heat when you really need it. I saw one guy that built a cement mass home like that at 8700 feet in the Rockies and never lights a fire in winter. Winter comes damned early at 8700 feet. The specification (which could be accomplished with thick cob too) requires no insulation inside, lots of water cannisters, and open design to circulate air naturally, and a long, narrow configuration. That was Colorado though, and they get lots of sunshine there compared to some place like WA or even Oregon's Cascades. p
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