[Greenbuilding] Most permeable air barrier

[Stephen Collette]

Hello Ross and all,

So, you want to try to outsmart all that water vapour boiling for days at a time? I think I know who might win that contest, even with the brains and smarts that I know you have. What about a major operable roof vent? Maybe like to sliding telescope ceilings? Seriously if you insulate the walls and floor, you will stay somewhat comfy and a nice peaked roof that opens up to let the moisture out, won’t that work? 

Maybe I don’t know enough about your plan to make a sound judgement, or I’ve been drinking too much home brew. Both are possible. So why do you want to seal a building that historically is as drafty as possible? If because you can, if done right, I’m interested in the solution as well, if because your toes get cold boiling the sap, then I might go about it differently. 

So, yeah, now I’m curious.

Stephen

Stephen Collette BBEC, LEED AP, BSSO
Your Healthy House - Indoor Environmental Testing & Building Consulting
http://www.yourhealthyhouse.ca <http://www.yourhealthyhouse.ca/>
stephen at yourhealthyhouse.ca <mailto:stephen at yourhealthyhouse.ca>
705.652.5159



> On Aug 31, 2015, at 2:00 PM, greenbuilding-request at lists.bioenergylists.org wrote:
> 
> Subject: [Greenbuilding] Most permeable air barrier
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> I know Tyvek is way more permeable to water vapour than Typar, which are the only two choices available locally, but I'm building a sugar shack, which as its primary function is to dissipate a tremendous amount of water vapour. I don't want the water to condense on the ceiling air barrier, otherwise it may drip back into the syrup.  What's the absolute most vapour-permeable air barrier on the market, including those esoteric European membranes?
> 
> 
> Ross Elliott

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