Well, remember that Tyvek is not a vapor barrier---that's what makes it so useful but if you're going to use it I suggest you review partial pressures and decide if the vapor movement is in the direction you want it!

Lee
----- Original Message ----- From: "Brooke Clarke" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]>
Sent: Tuesday, May 15, 2012 10:05 AM
Subject: Re: [time-nuts] Water Proof Vent


Hi:

You might consider using a piece Tyvek material. You can get it free from the USPS in the form of a priority mailing envelope or at a construction site where it's used to warp the outside of houses.
Passes water vapor and air but not water.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Clarke4Congress.html



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