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Vapour BarrierTim Castle tcastle at sk.sympatico.ca
Fri Jul 11 20:18:47 PDT 1997
Will: Thanks for your response. Will Firstbrook WCB of BC wrote: > Mexican adobe structures that were covered in a plaster in order to > restore them actually cased significant damage. As it created a vapor > barrier that caused deterioration inside the wall. My understanding is > that cob needs to breathe. It can absorb quite a bit of moisture and > pass it through the wall. Sometimes vapor barriers cause more problems > then they are worth. right... the kind of thing I'm concerned about; I don't know how much moisture per day/month/whatever a household gives off, and consider that by spring a winter's worth will be frozen somewhere in the wall... which by the time it is cured, and has frozen in the fall would be extremely dry on the outside, and very (?) moist in the middle somewhere -- ie. big moisture differential. > > One could turn the question around, what is the benefit of a vapor > barrier? I thought the main benefit is to eliminate /reduce drafts thus Certainly drafts are nasty when it gets cold enough, but my concern is structural: if frost can heave a concrete basement wall, will it push apart a cob wall from the inside out? > I am attending a Cob workshop next week and I will try to get an opinion > and some advice on these questions. Great! Let me know what you find out. I am planning to go to a workshop, too, but only if cob is an appropriate building method for our climate! -- Tim
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