Greetings!
 
I am doing some work for a historic site.  One of the buildings is  made of 
stone.  It is small -- only about 250 square feet.    There is no dry wall or 
plaster inside of the building -- just stones and  mortar.   The building is 
currently used as a museum store / ticket  sales office.
It has a concrete floor, and a Siemans HVAC wall unit that heats and cools  
the space.
 
In the winter, there is no mold problem.  The heat takes care of  it.  But 
this summer has been extremely damp in Georgia and the air  inside this building 
smells like mold and mildew, although nothing is visable on  the interior 
walls of the builidng.  Drainage around the building is fine  -- there is no 
pooling of water or seepage.
 
Is there anything that is relatively safe that can be painted on the  
interior and/or exterior walls to prevent mold build-up?   Has anyone  on the list 
had experience with anti-mold products?
We need something that will be clear and not obscure the original  nineteenth 
century stonework.
 
Our current solutions are to purchase another Maytag dehumidifier [we have  
them in the other buildings on the site] to augment the dehumidifying  
properties of the HVAC system, as well as to perhaps run the heat from time  to time 
-- even though our heat index right now is around 109 and up  daily.
 
Advice about dealing with mold in stone buildings would be much  appreciated.
 
Cordially,
Pamela Sezgin

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