Pad marks that form on milled limestone surfaces can remain long after the stone has been installed as masonry elements in buildings. Detracting from the otherwise aesthetically pleasing appearance of Indiana Limestone, pad marks have plagued the dimension-limestone industry for many years. To investigate the source and potential remediation of pad marks, an investigation was undertaken by the Indiana Geological Survey that began by exposing various padding materials to ambient weather conditions in south-central Indiana. Eighty-two dimension limestone test specimens, which were separated by padding materials consisting of Homasote, Styrofoam, and nylon in combination with various materials from paper toweling to sheet plastic were stacked four deep on pallets and allowed to weather for one year. At approximately three-month intervals, the sample surfaces were inspected for pad marks, photographed, and the results recorded. Homasote produced pad marks within one month of initial exposure to the elements which the other types of padding material produced discolorations around the pad, the stone directly beneath remaining clear. After one year, 11 pad-marked samples were exposed to weathering. Six of the specimens were placed to face east or south and the remaining samples faced north. The samples exposed to bright sunlight (east-and south-facing) were free of pad marks, within two weeks, whereas the stones that faced north retained the surface discolorations indefinitely.
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Indiana Geological and Water Survey
611 North Walnut Grove
Bloomington, IN 47405-2208
IGS Return Policy
All sales are final. Materials may not be returned after they have been accepted by the customer. Any discrepencies in mail orders must be reported to IGWS within 10 days of receipt of order.
The Indiana Geological and Water Survey will refund the purchase price and sales tax of products if returned with the original sales receipt within 10 days of receipt of order. Refunds will be issued with the same method of payment as indicated on the original receipt except for cash purchases, which will be refunded by check. Items must be returned in the same condition as purchased. Refunds on digital products and services are not allowed, except for defective media such as CD-ROMs, flash drives, and so on. The customer is responsible for paying shipping costs to return items.