Underpinning Waterproofing & Tie-Back Detailing
Serving Los Angeles, Pacific Palisades, and Malibu
Your #1 Choice
Full Support Service
Have Questions? We Are Happy To Help You Anytime
Specialized Waterproofing for Underpinned and Retained Structures
We provide professional waterproofing services for underpinned foundations and tie-back walls across Los Angeles, Pacific Palisades, and Malibu.
Our work focuses on protecting existing structures that have been reinforced or supported through underpinning or shoring, ensuring the new and old sections are seamlessly waterproofed as one continuous system.
Purpose of Underpinning Waterproofing
When an existing foundation is underpinned or extended, the new concrete section introduces cold joints and potential pathways for water intrusion.
Proper waterproofing ensures that both the original foundation and the underpinned section remain fully protected against groundwater and hydrostatic pressure.
Our approach focuses on membrane continuity, joint sealing, and tie-back penetration detailing to maintain a watertight envelope around the entire structure.
Systems & Materials We Install
Fluid-Applied Membranes
Used where complex geometry or uneven surfaces are present. Fluid membranes bond directly to both old and new concrete, creating a continuous barrier over cold joints and reinforcement tie-ins.
Bentonite Waterproofing Liners
Ideal for confined spaces or vertical walls formed during underpinning. Once hydrated, the bentonite swells to fill voids, providing reliable self-sealing protection around joints and tie-backs.
Protection & Drainage Layers
Installed to relieve hydrostatic pressure and safeguard membranes during backfill.
We include vertical drainage mats and footing drains where necessary to maintain system performance and durability.
Tie-Back & Penetration Detailing
Tie-backs and soil nails used during shoring or underpinning can create direct pathways for water.
Each penetration is sealed individually using compatible detailing materials to ensure the membrane remains continuous.
Our detailing covers:
Tie-back heads and anchors
Cold joints between new and existing foundations
Re-entrant corners and step-downs
Horizontal-to-vertical transitions
Surface Preparation & Application
All surfaces are cleaned, sound, and prepared according to manufacturer specifications.
Existing wall areas are inspected for cracks or laitance before membrane installation.
Membrane overlaps and terminations are verified for full adhesion and continuity.
Installed waterproofing is protected immediately prior to backfill or additional trades.
Hydrostatic Pressure & Drainage Integration
In areas like Malibu and Pacific Palisades, where soil moisture and groundwater levels are high, managing hydrostatic pressure is critical.
Our systems integrate:
Vertical drainage mats behind walls
Footing drains wrapped in gravel and filter fabric
Clean-outs and inspection ports for maintenance access
This combination keeps lateral water pressure low and prevents water buildup behind underpinning walls.
Compliance & Documentation
All work follows Division 07 – Waterproofing standards and manufacturer guidelines.
We provide submittals, detail sheets, and field condition documentation as required for project coordination and quality assurance.
Service Areas
Providing professional underpinning and tie-back waterproofing across:
Los Angeles • Pacific Palisades • Malibu • Beverly Hills • Brentwood • Santa Monica
Request Underpinning Waterproofing Coordination
Send your wall sections, foundation details, or tie-back layouts for a scope review.
We’ll confirm system compatibility, detailing sequence, and drainage strategy for your project.
→ Submit drawings or specifications to begin waterproofing coordination.