Where is your facility/museum located (town, state)? That may make a difference in the recommendation. 65 degrees is really cold for the summer. Depending upon your specific situation and lay-out of HVAC equipment & duct work, I would guess that you are getting condensation on the ductwork, which is causing the ceiling to be wet from dripping above it. This is relatively common, but is not always noticed. Do the ducts run near the spots? What type of ceiling do you have - plaster, drywall, suspended, something else? How does the moisture show up - damp spots, water dripping, mold growing, something else? The more info you can present, the better the answer. Of course, nothing beats in-person observation.
Marc
American Conservation Consortium, Ltd.
4 Rockville Road
Broad Brook, CT 06016
www.conservator.com
860-386-6058
*Collections Preservation Consultation
*Conservation Assessments & Surveys
*Environmental Monitoring & Low-Tech Control
*Moisture Management Solutions
*Collections in Historic Structures
*Collections Care Grant Preparation
*Conservation Treatment of:
Furniture
Painted Wood
Horse-Drawn Vehicles
Architectural Interiors
Decorative Objects & Folk Art
Marc A. Williams, President
MS in Art Conservation, Winterthur Museum Program
Former Chief Wooden Objects Conservator, Smithsonian Institution
Fellow, American Institute for Conservation (AIC)
From: charlene martin
Sent: Tuesday, August 25, 2015 10:58 AM
To: [log in to unmask]
Subject: [MUSEUM-L] HVAC settings for mixed collection storage rooms
Hi everyone -
I have one storage room for housing textiles, paper documents, books, and mixed-medium artwork.
I have set my HVAC for 65 degrees with a 5 degree season shift, and he relative humidity for 50% with a 5 percent seasonal drift.
Is this good for a mixed collection storage room? Has anyone heard of this causing moisture to be gathering in spots on the ceiling?
Thank you!
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