Below-Grade Waterproofing
Fix dangling cross-references: vapor-barriers-under-slab, mechanical-insulation
Showing changes from Rev 6
to Rev 7
in Below-Grade Waterproofing.
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title: Below-Grade Waterproofing
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description: >
When to use: Waterproofing and dampproofing of below-grade foundation walls and slabs-on-grade or suspended slabs below finished grade for commercial, institutional, and residential buildings. Covers all primary membrane types used in positive-side and blindside/pre-applied configurations: self-adhering modified bituminous sheet, fluid-applied elastomeric, bentonite geosynthetic clay liner, and hot-applied rubberized asphalt. Addresses dampproofing for non-hydrostatic conditions, substrate preparation, protection course, drainage composites and foundation drainage, detailing at penetrations and construction joints, and field testing including flood test and electronic leak detection.
− Not intended for: Plaza deck and parking structure waterproofing over occupied space (see [[sync/membrane-roofing]]); below-slab vapor retarder installed as a standalone vapor control measure without waterproofing (see [[sync/below-slab-vapor-barrier]]); waterproofing of water-containment structures (tanks, reservoirs, pools); concrete integral crystalline waterproofing admixtures (see [[sync/cast-in-place-concrete]]); foundation drainage design without a waterproofing scope (see [[sync/foundation-drainage]]).
+ Not intended for: Plaza deck and parking structure waterproofing over occupied space (see [[sync/membrane-roofing]]); below-slab vapor retarder installed as a standalone vapor control measure without waterproofing (see [[sync/vapor-barriers-under-slab]]); waterproofing of water-containment structures (tanks, reservoirs, pools); concrete integral crystalline waterproofing admixtures (see [[sync/cast-in-place-concrete]]); foundation drainage design without a waterproofing scope (see [[sync/foundation-drainage]]).
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### For slabs-on-grade that are dampproofed rather than waterproofed, a 4-in.-minimum granular drainage layer of clean, open-graded aggregate beneath the slab shall be provided and shall be tied into the perimeter drainage system.
−### The dampproofing slab condition does not eliminate the need for a sub-slab vapor retarder where the slab supports flooring materials sensitive to moisture vapor transmission; coordinate with [[sync/below-slab-vapor-barrier]].
+### The dampproofing slab condition does not eliminate the need for a sub-slab vapor retarder where the slab supports flooring materials sensitive to moisture vapor transmission; coordinate with [[sync/vapor-barriers-under-slab]].
# Waterproofing Materials {toc}
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## Backfilling before flood test and ELD is the single most damaging construction sequencing error in below-grade waterproofing because it converts a correctable deficiency into an excavation-and-reconstruction problem. {note}