Historic Roads in the National Park System
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APPENDIX D: STANDARD ARCHITECTURAL DETAILS HEADWALLS. FOR CULVERTS
Under the direction of Tom Vint, the Division of
Landscape Architecture, later known as the Branch of Plans and Design,
produced standardized details for certain features along roads. The
specifications on the following sheets noted:
STONES. Weathered stones are preferable. No freshly
broken stones shall be exposed. Round stones are not to use used. Stones
shall have wall heights of not less than 6 inches nor more than 18
inches and wall lengths of not less than 18 inches nor more than 48
inches. All stones to be laid with their larger dimension horizontal.
Four joints should not come together.
ARCH RINGS. Key stone to be not less than 22 inches
in height. All arch ring stones to be shaped to the approximate face
dimension shown.
JOINTS. Mortar joints to be generally 1 inch to 1-1/2
inches wide, well filled and pointed to a depth of 1 inch to present a
wavy plain surface.

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