The Effects of Herbicide on Stone and Masonry
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The Effects of Herbicide on Stone and Masonry National Center for Preservation Technology and Training Caitlin Oshida, Debbie Smith and Mary Striegel, Ph.D. Brick 26% Concrete 12% Sandstone 9% Limestone 15% Marble 6% Granite 15% Other 17% Historic Feature Materials Roundup® (Glyphosa te) 58% Vanquish® (Dicamba) 1% Garlon 4® (Triclopyr) 22% Arsenal® (Imazapyr) 1% Other 18% Types of Herbicides Used Survey Results Collected From National Park Service Sites Types of Historic Features House Outbuilding Fort Monument Cemetery Other 0 10 20 30 40 50 60 Historic Features Yes No 0 40 80 Are Herbicides Used To Remove Unwanted Vegetation? Responses Experimental Design Potential Effects • Roundup® • Garlon 4® • Salt crystallization (efflorescence) • Discoloration • Change in pH • Pitting/change in surface • Accelerated deterioration Preliminary test brick samples before (left) and after (right) being submerged in Roundup® herbicide for 24 hours and dried for 24 hours; visible signs of efflorescence. Purpose • Brick • Limestone • Granite • Concrete Historic Materials Herbicide s Far right: Chiseling out concrete samples. Right: Bottle of Roundup® that can be bought at the local store. R e s p o n s e # R e s p o n s e # When herbicide is applied to vegetation close to historic structures, some of the herbicide will come into contact with the feature. Based on this study, an experiment has been developed that will test the effects of herbicide on historic stone and masonry material. Far left: Spray application of herbicide near a building. Left: Dyed herbicide shows where it actually ends up on the structure. Photo courtesy of Jason Church
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Caitlin Oshida, NCPTT materials research and historic landscapes intern, provides information about herbicides and their possible negative effects on historic brick and masonry at The 10th Annual Preservation In Your Comminity. She also provides alternative methods to safely apply those materials.
Transcript of The Effects of Herbicide on Stone and Masonry
The Effects of Herbicide on Stone and MasonryNational Center for Preservation Technology and Training
Caitlin Oshida, Debbie Smith and Mary Striegel, Ph.D.
Brick26%
Concrete12%
Sandstone9%
Limestone15%
Marble6%
Granite15%
Other17%
Historic Feature Materials
Roundup® (G-
lyphosate)58%
Vanquish® (Dicamba)
1%
Garlon 4® (Triclopyr)
22%
Arsenal® (I-mazapyr)
1%Other18%
Types of Herbicides Used
Survey Results Collected From
National Park Service Sites
Types of Historic Features
House Outbuilding Fort Monument Cemetery Other0
10
20
30
40
50
60Historic Features
Yes No0
20
40
60
80
100
Are Herbicides Used To Re-move Unwanted Vegetation?
Responses
Experimental DesignPotential Effects
• Roundup®• Garlon 4®
• Salt crystallization (efflorescence) • Discoloration• Change in pH• Pitting/change in surface• Accelerated deterioration
Preliminary test brick samples before (left) and after (right) being submerged in Roundup® herbicide for 24 hours and dried for 24 hours; visible signs of efflorescence.
Purpose
• Brick• Limestone
• Granite• Concrete
Historic Materials
Herbicides
Far right: Chiseling out concrete samples. Right: Bottle of Roundup® that can be bought at the local store.
Response #
Response #
When herbicide is applied to vegetation close to historic structures, some of the herbicide will come into contact with the feature. Based on this study, an experiment has been developed that will test the effects of herbicide on historic stone and masonry material. Far left: Spray
application of herbicide near a building. Left: Dyed herbicide shows where it actually ends up on the structure.
Photo courtesy of Jason Church
