[GSBN] Bulk moisture damage

[Lorenzo Robles]

Hello Derek,
I have seen something quiet alike what you describe, in a pile of stored bales in a barn that had its north wall made of bare concrete blocks.
The bales were, of course, right against that wall.
There were no leaks from the roof at all.
The damage was higher on the bales side that touched the concrete, in a dept of some 8 inches.  We believed that condensation from airs humidity took place on the cold surface of the cement, right through those breathable bales, and in return the condensed water soaked day after day the straw.  this was in the north of France, where almost all year round the air is misty in the morning, and carries lots of humidity in wintertime.
This bulk moisture can of course be caused by interior humidity, often condensing on poorly insulated north walls (which would need to be insulated from outside rather than inside, to keep mass in and allow the insulation to breath.).

Lorenzo Robles



> Date: Thu, 2 Jul 2009 13:35:25 -0600
> From: derek at unm.edu
> To: jeff at odiseanet.com; GSBN at greenbuilder.com
> Subject: Re: [GSBN] Bulk moisture damage
> 
> Great question, Jeff.  I'm not sure where you would put some of Rob 
> Jolly's case studies for CMHC.  If my memory serves, he found several 
> homes with moisture damage over a fair percentage of a wall (usually 
> the north wall), where the moisture damage was believed to be caused by 
> wind-driven rain against cement stucco.  Other case studies involved 
> plumbing, window, and roof leaks.
> 
> Derek
> 
> --On Thursday, July 2, 2009 12:19 PM -0700 Jeff Ruppert 
> <jeff at odiseanet.com> wrote:
> 
> > This question has come up from time to time in our circles, and I
> > don't think any one person can answer it because the answer is based
> > on our collective experience.  So this is more of a poll than
> > anything else.
> > The question is, has anyone been involved with a moisture damaged
> > bale structure that was *not* due to a leak (bulk moisture)?  Or to
> > put it another way, has anyone seen damage from sources such as
> > interior humidity or plain old high humidity in wet climates, or any
> > other sources than leaks from windows, roofs, etc?
> >
> > Thanks,
> >
> > Jeff
> 
> 
> 
> Derek Roff
> Language Learning Center
> Ortega Hall 129, MSC03-2100
> University of New Mexico
> Albuquerque, NM 87131-0001
> 505/277-7368, fax 505/277-3885
> Internet: derek at unm.edu
> 
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