Advanced Analytical Techniques

Dendrochronology

Dendrochonology, or tree ring dating, relies on subtle variations in tree growth due to the unique environmental conditions associated with each growth season (i.e., each tree ring). If a core sample of a wooden component contains the outermost wood layer beneath the bark, the sequence of rings shown in that component can be correlated with a master sequence for the species of wood involved, so as to arrive at the exact year the associated tree was cut down.

The remarkable technique has enormous potential for log buildings, braced frame buildings, or any building with large wooden members containing the outermost tree ring. It has been successfully employed in western United States, and recent experiments suggest it will also prove useful in the more variable eastern climates.

However, in order to be used in a specific locale, it is necessary to establish reliable master sequences for the species involved. In addition, the analysis of the core samples requires a high degree of statistical sophistication. Perhaps the high initial cost can be alleviated over time if multiple analyses within given geographical areas allow an economy of scale.

Imaging of Hidden Elements

The inability to reasonably access hidden parts of buildings often frustrates the researcher's attempts to examine the material evidence of construction technoloty. For example, framing systems and other structural details are often unseen unless a building is being thoroughly restored or (heaven forbid!) demolished. Obviously a practical, non-destructive method to see the inner parts of buildings should be a priority for building investigators.

X-ray photography has proven to be a reliable method for viewing hidden features of buildings. However, the equipment is expensive and potentially dangerous, and requires special expertise. Perhaps safer, less expensive methods using alternative imaging systems similar to those now being developed for medical use (e.g., ultrasonic imaging, magnetic resonance imaging, etc.) will become available for building investigation in the near future.

About the CHP | CHP Intiatives | CHP Services | 
Resource Library | Preservation Directory | Contact the CHP