SECTION 912 — REMOVE AND REBUILD OR CONSTRUCT NEW DRY-LAID STONE WALLS 900-37 — REMOVE AND REBUILD OR CONSTRUCT NEW DRY-LAID STONE WALLS
912.01 Description.
This work includes the removal and resetting of existing sections or the construction of new sections of dry-laid stone walls at the required locations. Walls will be considered double faced.
912.02 Materials.
Use stones to construct new walls that conform to SECTION M14. Use stones in walls designated to be removed and reset that include the stones in the existing wall and any additional stones required to complete the work. Use any additional stones necessary to complete the wall sections that conform to the existing stones relative to shape, texture, color , and geological composition. For existing walls comprised predominantly of flat stones, ensure that any additional stones required are not less than 3 in . thick, 10 in. wide, and 12 in. long in size. For walls comprised mostly of round stones, ensure that any additional stones required are not less than 9 in. thick, 12 in. wide, and 12 in. long in size. Stones that are smaller than these dimensions may be used only for pinning and/or filling interstices within the wall.
912.03 Construction Methods.
Trenching. Excavate trenches for constructing stone to a depth of 12 in. and to a width of 36 in. Laying Stone. Lay the stones to line and in courses roughly leveled up. Ensure that the bottom, or foundation, courses are composed of large stones and are laid to form a relatively flat surface upon which the succeeding courses may be placed. Fill the open spaces around the foundation (or base) of the wall with suitable material excavated from the trench. Lay all stones with bearing beds parallel to the natural bed of the material. Use select stones, roughly squared, at the ends and at angles in the wall. Ensure that t he foundation courses consist of the large stones and that the thinnest courses are placed towards the top of the wall. Provide a stone wall that has a width of not less than 24 in. and a height of 3 ft above the surround- ing ground surface . These dimensions may be increased or decreased where necessary to conform to adjoining walls that will remain in place. If, to complete the wall, it becomes necessary to use stones other than those that are in the existing wall, use the additional stones in the foundation and distribute evenly throughout the wall. Ensure that each stone takes a firm bearing at not less than three separate points upon the underlying course. Chink open joints and fit spalls to provide firm bearing throughout the length of the stone. Ensure that face joints do not exceed 1 in. in width. Chinking will be permitted only in horizontal joints in the faces. Do not chink vertical joints in the faces of the wall.
Part 900 — Incidental Construction and Services August 2025
900-38 SECTION 912 — REMOVE AND REBUILD OR CONSTRUCT NEW DRY-LAID STONE WALLS Ensure that header stones hold in the heart of the wall and extend not less than 12 in. into the core and that they occupy not less than one- fourth of the face area of the wall and are evenly distributed. Extend header stones in walls 2 ft or less in thickness entirely through the wall. Finish the top of the wall flat , and ensure that the wall contains tie stones that extend entirely across the width of the wall. Ensure that tie stones consist of no less than one-fourth of the stones in the course. Ensure that all stones used in the top course have a width of at least 8 in. and a thickness of at least 3 in.
912.04 Method of Measurement.
Remove and Rebuild New Dry-Laid Stone Walls or Construct New Dry -Laid Stone Walls will be measured by the number of linear feet of continuous runs of the constructed or reconstructed walls installed.
912.05 Basis of Payment.
The Department will pay for the completed and accepted quantities as follows: Pay Item Pay Unit Remove and Rebuild New Dry-Laid Stone Walls LF Construct New Dry-Laid Stone Walls LF The prices constitute full compensation for all labor, materials , equipment, and incidentals required to finish the work, complete and accepted. Excavation below the designated slope or subgrade line for the installation of dry-laid stone walls will be paid for according to SECTION 203. Stones required for the construction of new walls will be included in the C ontract price for Construct New Dry-Laid Stone Walls. Stones provided by the Contractor to supplement quantities of existing stones from existing walls to meet the requirements of this Specification will be paid for separately under the bid item, Supplementary Stones for Walls.
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