SYMPOSIA PAPER Published: 26 November 2021

Nonuniform Wetting/Drying Behavior of Exterior Granite-Slab Pavers: An Interchange


Exterior dimension stone pavers, particularly when fabricated from relatively thin granite slabs, can experience nonuniform wetting/drying in service that manifests itself as an obvious color variation between the center and perimeter of each unit. The existence of the phenomenon, referred to with terms such as “haloing,” “picture framing,” or “ghosting,” is known to dimension stone subject matter experts, experienced stonemasons, and some design professionals. However, details about the mechanism of causation are complex and not well understood, which challenges our ability to predict specific stones that will be more vulnerable to this color variation in service, and advice in the industry literature about effective avoidance techniques is limited and fragmented. This paper intends to elevate awareness of the granite-slab paver nonuniform wetting/drying phenomenon by defining the problem, highlighting aspects of relevant conventional wisdom, and sharing steps that we are taking toward advancing this discussion in the dimension stone community. Our ultimate goal is to compile the dimension stone community’s knowledge and experience toward the development of reliable solutions.

Author Information

Karras, John, N.
Simpson Gumpertz & Heger Inc., Washington, DC, US
Landis, Evan, J.
ECS Mid-Atlantic, LLC, Chantilly, VA, US
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Pages: 210–219
DOI: 10.1520/STP162820190166
ISBN-EB: 978-0-8031-7703-1
ISBN-13: 978-0-8031-7702-4