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Foundation & Below-Grade Waterproofing

Serving Los Angeles, Pacific Palisades, and Malibu

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We install complete below-grade waterproofing systems designed to protect structural foundations, retaining walls, and subterranean spaces from hydrostatic pressure and groundwater intrusion. Our work begins once concrete or shotcrete walls are formed — integrating membranes, drainage, and detailing to create a continuous, long-term waterproofing assembly.

Why Below-Grade Waterproofing Is Critical

Concrete alone is not a waterproof barrier. In hillside, coastal, and below-grade construction, groundwater and hydrostatic pressure can penetrate through cold joints, tie-backs, and wall interfaces. Proper waterproofing must be installed during the construction phase to prevent moisture migration, interior damage, and structural deterioration over time.

We install membrane and drainage systems prior to backfilling, ensuring walls remain protected for the life of the structure.

Waterproofing Systems We Install

Tremco TREMproof® 250GC

A fluid-applied, cold-applied waterproofing membrane that forms a seamless barrier over concrete and shotcrete. Ideal for complex wall conditions, transitions, and detailing around penetrations.

  • Visible cracks in walls or floors

  • Doors and windows sticking

  • Uneven or sloping floors

  • Gaps around window frames or doors

CETCO Voltex® Bentonite Membrane

A geosynthetic clay liner that self-seals when hydrated and confined. Commonly used on retaining walls and foundation walls before backfill, especially in high-moisture soil conditions.

Drainage & Protection Components

  • Drainage boards to relieve water pressure

  • Protection boards to shield membranes during backfill

  • Fabric-wrapped French drains and gravel systems at footing level

  • Optional sump tie-in integration where gravity drainage is not available

Application Areas

We waterproof a wide range of structural wall assemblies, including:

    • Foundation walls (formed or poured concrete)

    • Retaining walls behind grade transitions and hillside cuts

    • Shotcrete/lagging walls installed during shoring or deep excavation

    • Basement and podium walls in subterranean builds

    • Footing and underslab transitions requiring vertical-to-horizontal continuity

Surface Preparation & Installation Sequencing

Proper waterproofing depends on substrate readiness. We coordinate installation to ensure:

    • Surfaces are clean, sound, and free of laitance or debris

    • Voids, honeycombs, and surface defects are addressed per system requirements

    • Membranes are applied under appropriate moisture and temperature conditions

    • Assemblies are protected prior to backfill or exterior wall finishes

Detailing & Penetration Sealing

Critical detailing is performed to maintain an unbroken waterproofing envelope:

    • Footing and wall terminations

    • Cold joints and construction joints

    • Tie-back and soil nail penetrations

    • Pipe sleeves, conduits, and embedded hardware

    • Termination angles and edge conditions at grade

Hydrostatic Pressure Management

Waterproofing systems are paired with drainage design to reduce long-term water pressure against the structure:

    • Vertical drainage composites to guide water downward

    • French drains and gravel trenches to move water away from the wall

    • Filter fabrics to protect long-term flow path integrity

    • Clean-out access where required for serviceability

System Compliance & Documentation

Installations follow manufacturer specifications and Division 07 waterproofing requirements. Submittals, product data, and assembly detailing are provided where required. Site conditions are verified prior to application, and membrane integrity is maintained through subsequent trades and backfill operations.

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Service Areas

We provide below-grade waterproofing services throughout:
Pacific Palisades • Malibu • Los Angeles • Beverly Hills • Santa Monica • Brentwood & Surrounding Areas

Request Waterproofing Scope Review

Submit plans or wall sections for specification alignment, membrane selection, and drainage detailing. We assist with assembly selection based on soil conditions, water table level, and structural design requirements.

→ Send drawings or details to begin waterproofing coordination.

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