Environmental Graph Interpretation

Jakob Heitz (jheitz) jheitz at cisco.com
Wed Nov 11 17:57:12 UTC 2015

If the temperature of the floor is below the dew point, then it will sweat.
Maybe there's a cold wind blowing underneath the gap?


> -----Original Message-----
> Date: Tue, 10 Nov 2015 17:25:04 -0600
> From: "Lorell Hathcock" <lorell at hathcock.org>
> It is on the ground floor, but it is in a hut that has a wood floor that is
> raised off the ground.  There is a gap between the bottom of the floor and
> the ground.
> -----Original Message-----
> From: Valdis.Kletnieks at vt.edu [mailto:Valdis.Kletnieks at vt.edu]
> Sent: Tuesday, November 10, 2015 5:13 PM
> To: Lorell Hathcock <lorell at hathcock.org>
> Cc: 'NANOG list' <nanog at nanog.org>
> Subject: Re: Environmental Graph Interpretation
> On Tue, 10 Nov 2015 16:48:04 -0600, "Lorell Hathcock" said:
> > Are there any one the list that would care to take a look at some
> > graphs of temperature, relative humidity and dew point that I have for two
> locations.
> > In one of the two locations, I'm having a problem with the floor
> > getting wet (condensation?).  At the other everything is just fine.
> Is your moisture problem on a ground floor?  Note that even well-cured
> concrete is like 30% water, and can allow moisture to slowly migrate through
> and weep.  Usual cure is application of a proper sealant over the concrete.

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