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What are Boulder Builders rocks constructed of?

April 26, 2017Boulder builders constructed rocks

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What are Boulder Builders rocks constructed of?

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The underlying frame or “skeleton” varies depending on the size of the rock, but the outside is “shotcrete” –a special form of concrete that is sprayed over the skeleton. Depending on the size of the rock, the thickness of this outer shotcrete layer is typically 1-3 inches thick.