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I <Heart>Brownstones:Not Just a Pretty Façade
Friday, March 3, 2017
Generously hosted by
Michael DevonshireArchitectural Conservator
______________________Partner and Director of Conservation
Jan Hird Pokorny Associates, Inc. jhpokorny.com
Brownstone
Formation Cycle
Granite
Sandstone, Limestone
Marble,Slate,Gneiss
Why it’s “brown”
Rock faced
Scabbled
Punched
HammeredCombed
Chiseled
Margined
Inadequate choice of stoneHarmful extractionCareless shipmentInappropriate storage (cure)Bad workmanshipPoor placement
Acid rainDry depositionSalt crystalizationFreezing waterHygric swellingBiological attackThermal effectsMechanical damage
Inappropriate treatments
• Bacteria
• Algae
• Fungi
• Lichens
• Mosses
• Higher Plants
• Animals
• Test for salts
• Determine composition of material (chem/micro)
• Test soil for water level, drainage capacity
• Assess moisture level, porosity of material
• Monitor cracks, efflorescence
• Determine construction details
• Perform material analysis
(ex: infrared thermograph)
~END~
Thank you!