Stone Masonry

Standard specifications today may reference standard plans (details), but our local specifications don’t have details within the text. That was not necessarily the case 70 years ago. I recently looked through “Specifications for Construction of Roads and Bridges in National Forests and National Parks, 1941”, published by the Federal Works Agency Public Works Administration. They include a detail with the specification for Stone Masonry. Specification verbiage referencing that detail included the following:

“Unless otherwise shown on the drawings, stones shall conform to sizes shown in the figure appearing in this item, and, in general, shall have thickness of not less than 5 inches, widths of not less than one and one-half times their respective thicknesses, with minimum widths of 12 inches and lengths of not less than one and one-half times their respective widths.”

Stone masonry Class B spec adjustedStone masonry Class A spec adjusted