Track 2: Materials over Time: Points of Change
APT Student Scholar Abstract
Evaluating the Deterioration of Historic Cement Stucco Using Traditional Condition Assessment and Digital Analyses
Tuesday, September 25
8:30 AM - 10:00 AM
Location: BNCC- 101BG
John Hinchman, BFA, MFA, MS – University of Pennsylvania
The John Moulton homestead, constructed in 1934, is one of four intact homesteads in the Mormon Row Historic District within Grand Teton National Park in Wyoming. The homestead is a vernacular one and a half story wood frame structure finished with pink-painted cementitious stucco and is remarkably unaltered since construction. The National Park Service has been the steward of the structure since 1990, offering limited access and preservation through mothballing. At the present, the stucco exhibits severe cracking due to a number of causes including a lack of designed expansion joints, structural settlement, and possible thermal expansion. The NPS would like to open the site to visitation while preserving the integrity of the structure with minimal intervention. This paper focuses on the process of evaluating the condition of the historic cement stucco by using a combination of traditional recording methodologies augmented with digital analytical mapping tools to better understand the causes of deterioration. Based on the complexity of the cracking patterns evident on the stucco we have elected to experiment with geographic information systems (GIS), which can be used to statistically evaluate the spatial relationship of selected variables to assist in diagnosing the causes of crack propagation and type and help guide a minimal repair strategy. In the process of creating and analyzing the conditions, this project presents the opportunity to test the degree to which GIS and other digital tools (like photogrammetry and infrared thermography) can clarify and better illustrate conditions beyond traditional conditions documentation and inform treatments to be implemented.
- Analyze the usefulness of digital tools in conditions assessments.
- Describe which new materials and interventions to enact, and where these should be implemented on the structure.
- Characterize the deterioration of a mass-produced material, cement stucco, in an extreme climatic zone.
- List various causes of cement stucco deterioration.