[Greenbuilding] Relative humidity in heated houses

[John Straube]

50 per cent RH in buildings in COLD climates is a major source of condensation, and thus rot mold and corrosion. Normal homes and buildings are not designed for this RH and so problems ensue. 
This is a huge issue for museums which fail regularly. 
Art does not need 50 per cent it need stability. Smart museums (like the Smithsonian) have started to understand this and run lower winter RH and higher summer. The key is slow changes not absolute value. For organic and painted canvas art lower RH is better but it is hard to keep summer RH below 50.  
John Straube
519 741 7920
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-----Original Message-----
From: Sacie Lambertson <sacie.lambertson at gmail.com>
Sender: greenbuilding-bounces at lists.bioenergylists.org
Date: Wed, 27 Oct 2010 08:09:47 
To: jfstraube<jfstraube at gmail.com>
Cc: Greenbuilding<greenbuilding at lists.bioenergylists.org>
Subject: Re: [Greenbuilding] Relative humidity in heated houses

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