Mark,
I'm with Ken on this, but I'll ask a few more questions:
How deep does the wall go below grade?
What is the condition of the soil below grade, water table, plantings along
the wall etc?
I assume the plaster repairs were in the first floor level and not below.
Is the first floor at or near grade?
What is the condition of joist ends if bearing in the masonry, joists, wood
flooring, base trim etc?
Is there ventilation below the first floor?
I assume the "terne metal" sheet is completely through the wall.
Is this a uniform condition around the building or localized?
Obviously higher temperature and air changes will help somewhat if you want
to accelerate the drying.
Eric Hammarberg
Associate Director of Preservation
Associate
LZA Technology
641 Avenue of the Americas
New York, NY 10011-2014
Telephone: 917.661.8176 (Direct)
Mobile: 917.439.3537
Fax: 917.661.8177 (Direct)
email: [log in to unmask]
-----Original Message-----
From: Mark Mordhorst [mailto:[log in to unmask]]
Sent: Thursday, March 28, 2002 8:03 AM
To: [log in to unmask]
Subject: Re: moisture retention in red birck
No, I'm not sure it's residual moisture but there are few other explanations
that seem viable. The project was specifically as damp-proofing with the
installation of a sheet of terne metal at mortar line near the base of the
ground floor. We replaced interior lime plaster to a height of 4' or so. the
exposed masonry was only left open for about a month after the removal of
the dead plaster so I'm guessing that the masonry never had a chance to dry
to an anmbient MC level at the height to which the damp had previously
risen. The idea of rainwater splashing onto the lower courses at the
exterior seems unlikely as we have had so little rain since then.
The moisture in the wall does not pose a significant problem; just looking
for an explanation so as to seem somewhat knowledgeable.
-----Original Message-----
From: Tricia vs. Julie!! Rosie is gay! Travertine falling! When will it
stop?? [mailto:[log in to unmask]]On Behalf Of Ken
Follett
Sent: Wednesday, March 27, 2002 10:40 AM
To: [log in to unmask]
Subject: Re: moisture retention in red birck
In a message dated 3/27/2002 7:26:40 AM Pacific Standard Time,
[log in to unmask] writes:
Is anyone able to direct me to data regarding rates of vapor transmission in
red brick/lime mortar construction, i.e., how long should it take an 18"
deep masonry wall to evaporate moisture from rising damp? On a particular
project I am surprised at how long residual moisture is hanging around
despite drought conditions in the mid-Atlantic region and modern HVAC sytems
in the building.
What you would get from lab test results on brick is one thing, what you
would get from a specific environment, surrounding conditions, details of
the construction, water retention capabilities of the soil, and character
of the specific materials composing the wall is another. What you see is
probably what you get. Are you sure it is residual moisture?
][<en
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