Architectural · A-9MYVN

Sub-Slab Vapor Monitoring Probe and Manhole Detail

Materials

Concrete

Elements

Floors / Slabs Vaults / Domes Waterproofing / Flashing Anchors / Embeds

Connections

Embed Plate

About this detail

The assembly is built over a prepared subgrade covered by a non-woven geotextile fabric and a minimum four-inch gas-permeable aggregate layer. A liquid vapor barrier system consisting of a VI-20 geomembrane base course, a minimum 60-mil liquid boot plus dry vapor barrier, and an Ultrashield G-1000 top protection course is installed beneath the concrete slab. A monitoring probe extends into the aggregate layer, connected via a quarter-inch inner diameter Teflon monitoring tubing that routes through a minimum 1.5-inch Schedule 80 PVC sleeve at the slab edge. The tubing extends through a minimum 1.5-inch Schedule 80 PVC conduit to an exterior grade monitoring station manhole. The manhole is a traffic-rated concrete vault with a cast iron water-tight lid, embedded in concrete slightly higher than the surrounding landscape grade to prevent runoff entry. The annular space between the PVC conduit and the Teflon tubing is sealed with a two-part foam sealant.

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