[Greenbuilding] Most permeable air barrier

[John Straube]

Not sure of your application Ross.  Seems it needs to be pretty tough if is to be suspended between rafters or some such with no other support.  And it needs to be airtight.  Some of the most permeable membranes do not fair well when tested for airtightness.
The best we have tested is Delta Foxx from Cosella Doerken, which is similar to Delta Vent.  Both are quite strong and physically durable and have perm ratings of over 500 US perms at high humidities (this is crazy high, and hard to measure with accuracy, but suffice to say, it is very high). And you can get it locally from Beamsville Ontario.

On Aug 30, 2015, at 2:10 PM, Ross Elliott <relliott at homesol.ca> wrote:

> 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 
> LEED-AP, RASDT, CPHC
> President
> Homesol Building Solutions Inc.
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John F Straube
jfstraube at uwaterloo.ca
www.JohnStraube.com