Environmental Guidelines Opportunities and Risks Fenella G. France, Preservation Scientist Eric F. Hansen, Chief, PRTD 
Library of Congress

    How well do current 
 environmental standards 
 and guidelines align with 
the conservation of heritage?

## Attaining Standards: Assessing Risk Existing Environmental Standards Recommendations And Guidelines (A Selection)

- British Standard BS5454: Recommendations for the 
storage and exhibition of archival documents. 
- ISO 11799:2003: Information and Documentation - 
Document Storage Requirements for Archive and Library 
Materials
- ANSI/NISO Z39.79-2001 ISSN: 1041-5653: 
Environmental Conditions for Exhibiting Library & Archival Materials
- NARA 1571: Archival Storage Standards - Library of Congress Guidelines & Specifications - Thomson, G., The Museum Environment - ASHRAE Chapter
- CEN Guidelines

Goals

Standards should enable, not deter

From historic practice to heritage based The underlying goal of best practice in environmental preservation is to attain optimum conditions to protect cultural heritage This should be aligned with the specific material-based needs of the artefact Environmental controls for preservation are long overdue for revision The current economic, political & climate changes challenge standards to be addressed in context of the above issues

## Cultural Heritage Institutions: Convergence Common Environmental Issues Storage: Immediate  & Archive Exhibition & Display Access: Public & Researchers The Environment: "Macro To Micro" Standards For Cultural Heritage In Context:

- The Building (historic architecture or modern)
- Building materials, - Cost of upgrade of structure & systems - Potential for retrofit
- The Room: Storage / Exhibition / Research
- Collection type / material specific needs - Cost of humidification / mechanical systems (active vs. passive control - Level of access / zoning - Tolerance levels for materials - Separation of collection: material based vs. content based - Collection vs. human comfort
- The Case: Display / Storage (Visual)
- Controlled environment (reduced energy costs) - Range of storage case control

## Factors That Impact The Building Climate Rooms: Storage / Exhibition /Research Economic Collections Energy Cases: Display / Visual Storage Standards

Buildings: Historic, Modern (define modern), Customised Knowledge Where are we currently?

What do we need to define?

Establishment of recognized overarching need to control / limit fluctuating conditions Standards state that temperature, relative humidity etc. should be at fixed points in a range To promote longevity customized buildings and specialized storage evolved e.g. Library of Congress special storage modules maintained at a constant 10°C and 30% RH
Advances in knowledge of changes in materials based on scientific studies Technology and engineering advances

## Collection Vs. Human Comfort Issues

- Maintaining and understanding the required 
environment
- Balancing preservation and access
- Collection vs. human comfort
- Utilizing technology and engineering advances 
effectively
- Linking with material properties - Increase access while preserving original
- Adapting standards and knowledge to local 
environments
- Stable versus fluctuating

## Gaps Collaboration, Research, Future

Understanding of fluctuations and cycling for relative humidity of specific materials Determining major cause of deterioration for specific materials

Differing requirements for materials & materials 
composites on exhibit, storage
Linking materials research with building control 
systems / level of control
Internationally agreed standards for cultural 
heritage buildings and collections 
Incorporation of local climate adaptations based 
upon measured material properties

## Standards Impacts / Concerns: Materials "Macro To Micro" Environmental Control Rh, Temp Etc. Damage Factor Tolerance Levels Micro Changes Acceptable / Irreversible Damage Overview

- Establish Advanced Knowledge of Materials Science 
for Preservation
- Tolerances & Actual Damage - Control of Damage Factors vs. Bulk Parameter
- International Materials Research Collaboration - Implementation of Standards Consensus / 
- International loans - Enabling Optimum Protection of Cultural Heritage
- Reality: Achieving Preservation in Current  Economic, 
Energy (mandates) & Climate Changes
- Best Allocation of Resources (cost benefit)
- Preservation & Access linked to Damage/Risk - Risk versus Value Assessments
- What is Acceptable / Inevitable Loss