Ptarmigan is Colorado quarried grey gneiss with hints of white and green. This is a very high density and strong stone. Ptarmigan Mosaic thin veneer allows you to bring the concept of a historic “rubble rock” wall into your project without the weight and cost of a full rock wall.
Ptarmigan Mosaic Information Card PDFDesigning with Thin Veneer
The RMMI does not recommend dry stacking thin veneer in Colorado in outdoor conditions.
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Natural Stone Institute
Rocky Mountain Masonry Institute