SECTION 811 — WEEP HOLES, PAVEMENT SUBDRAINS, AND WALL DRAINS — WEEP HOLES, PAVEMENT SUBDRAINS, AND WALL DRAINS
811.01 Description.
This work includes the provision of weep holes through abutments and walls; pavement subdrains through bridge decks; and wall drains behind abutments and walls at the required locations.
811.02 Materials.
Weep Holes. Provide weep holes that are 4 in. in diameter, Schedule 40 polyvinylchloride (PVC) pipe. Pavement Subdrains. Provide pavement subdrains that are 2-in. diameter PVC pipe. Wall Drains. Provide wall drains that are perforated PVC pipe conforming to Subsection M04.01.6. Filter Stone. Provide filter stone that conforms to Subsection M01.07. Filter Fabric. Provide filter fabric that is included in the Department’s Approved Materials List.
811.03 Construction Methods.
Weep Holes. To drain backfill material, place weep holes through abutments and retaining walls at the required locations. Pavement Subdrains. Install pavement subdrains after the waterproofing membrane has been placed and before the asphalt course is laid down. Cut the waterproofing membrane with a sharp blade so that tabs can be folded into the drain hole. Install the drain cap in the drain hole. Prevent displacement of the drain cap as the asphalt courses are placed. Wall Drains. Place pipe on compacted backfill materials. Place the perforated side of the pipe down. Place filter material around the pipe to form a cover of not less than 6 in. Tamp the filter material around the pipe.
Part 800 — Bridge Structures August 2025
SECTION 811 — WEEP HOLES, PAVEMENT SUBDRAINS, AND WALL DRAINS 800-83
811.04 Method of Measurement.
Weep Holes and Pavement Subdrains. Weep holes and pavement subdrains will not be measured separately for payment. Wall Drains. Wall Drains will not be measured separately for payment.
811.05 Basis of Payment.
Unless covered by a specific Proposal Item, materials for the installation of Weep Holes and Pavement Subdrains, and Wall Drains will not be paid for separately but will be included as incidental items in the Contract unit prices per cubic yard for the applicable classes of Portland cement concrete.
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