Clear communication
Straightforward proposals, scheduling updates, and responsive field communication.
For GCs, Architects & Developers
A Waterproofing Subcontractor Who Makes Your Project Easier
SPL Waterproofing works with general contractors, architects, and builders as a C-39 licensed subcontractor for decks, balconies, foundations, below-grade structures, and commercial waterproofing in Southern California.
Why waterproofing matters to your team
The Cost of a Bad Waterproofing Subcontractor
Waterproofing mistakes rarely show up right away. They create delays, failed inspections, change orders, and callbacks that are expensive and hard to fix once finishes are in place.
Schedule friction
Missed windows, poor coordination, and rework that pushes other trades.
Unclear submittals
Vague scopes and product substitutions that create confusion during review.
Hidden water intrusion
Leaks and moisture problems that appear after occupancy or closeout.
Poorly executed details
Flashings, transitions, and penetrations that were not properly addressed.
Our role on your project
Reliable Waterproofing for Professional Teams
Choosing a waterproofing subcontractor is about more than finding someone who can apply a membrane. It requires a partner who understands construction schedules, follows specifications, communicates clearly, coordinates with other trades, and delivers work that reduces callbacks. SPL Waterproofing has experience on high-end residential and commercial projects throughout Southern California.
Who we serve
Built for GCs, Architects, Developers & Property Managers
General Contractors
We coordinate with your schedule, other trades, and site conditions. We provide clear scopes, submittals, and closeout documentation to help keep the project moving.
Architects
We review drawings and specifications, propose appropriate systems, and follow CSI division guidelines. Our goal is to support your design intent with buildable details.
Developers
We help protect long-term asset performance by following manufacturer requirements and building codes, reducing hidden water intrusion risks.
Property Managers
We provide maintenance-minded remediation and phased work that limits tenant disruption while protecting structural integrity.
How we work
From Preconstruction to Closeout
Our process is designed to reduce surprises and keep waterproofing work clear, coordinated, and documented.
01
Review drawings and specifications
We examine plans, specs, and project conditions to understand the intended waterproofing assemblies and performance requirements.
02
Preconstruction input
We offer recommendations on system selection, sequencing, and details that can affect installation and long-term performance.
03
Coordinate with other trades
We work with concrete, framing, roofing, and other trades to align schedules and handoffs for critical waterproofing areas.
04
Install with attention to detail
We focus on substrate preparation, transitions, flashings, drainage, and manufacturer-required installation methods.
05
Closeout and documentation
We provide progress photos, warranty information, and submittal packages to support inspection and final turnover.
Scope & Specifications
Waterproofing Assemblies We Install
We install manufacturer-certified systems matched to project specifications, movement demands, substrate conditions, and environmental exposure.
Pedestrian & Deck Systems
Class A Fire Rated & Plywood/Concrete Substrates
Cementitious polyurethane, PMMA, and urethane deck coating assemblies for elevated decks, balconies, and walkways (e.g., Westcoat ALX/MACoat).
Typical Scope:
Plywood & Concrete Decks Balconies & Elevated Walkways Roof Decks
Liquid-Applied Membranes
Cold & Hot Fluid-Applied Elastomerics
Monolithic elastomeric coatings that conform to intricate detail flashes, split-slab assemblies, and planter boxes without seams.
Typical Scope:
Split-Slab Assemblies Planters & Green Roofs Complex Penetrations
Sheet Membrane Waterproofing
Self-Adhered & SBS Modified Bitumen
High-mil thickness rubberized asphalt sheet membranes providing uniform thickness and barrier protection for critical structural transitions.
Typical Scope:
Below-Grade Foundation Walls Plaza Decks Threshold Flashing
Below-Grade Structural Walls
Exterior Barrier & Drainage Composite Systems
Positive-side waterproofing applied strictly to exterior foundation wall surfaces paired with heavy-duty drainage mat protection boards.
Typical Scope:
Exterior Below-Grade Walls Retaining Walls Tie-Back Assemblies
Vapor & Air Barriers
Division 07 Weather-Resistive Barriers
Permeable and non-permeable fluid and sheet-applied air/water barriers behind cladding and open-joint wall systems (e.g., VaproShield).
Typical Scope:
Exterior Wall Assemblies Rain Screen Systems Commercial Cavity Walls
Manufacturer Partners
Approved Installers for Leading Systems
We work directly with manufacturer representatives to ensure spec compliance and full system warranty coverage.
Why teams choose SPL
A Subcontractor Who Reduces Risk
Attention to detail
Proper substrate preparation, flashing, drainage transitions, and manufacturer-approved installation methods.
Schedule discipline
We understand the importance of staying on schedule and coordinating with other trades to minimize delays.
Quality documentation
Progress photos, warranty documentation, and project closeout information.
Safety and professionalism
Licensed crews committed to maintaining safe, organized jobsites.
Long-term performance
Waterproofing systems designed to reduce maintenance and future callbacks.
Got Questions?
Frequently Asked Questions
Everything property managers and owners need to know about our apartment complex waterproofing process.
Have a unique property situation?
We evaluate complex stairwell layouts, multi-building sites, and active leak emergencies.
Talk to a SpecialistAre you licensed and insured?
Yes. SPL Waterproofing is a C-39 licensed contractor (#1088354), bonded, and insured for waterproofing work throughout Southern California.
Can you work from architectural drawings and specifications?
Yes. We regularly work from architectural drawings and specifications to provide accurate waterproofing solutions and submittals.
Do you coordinate with other trades on the jobsite?
Yes. We work closely with concrete, framing, roofing, and other trades to align schedules and handoffs for waterproofing areas.
What types of waterproofing systems do you install?
We install liquid-applied membranes, sheet membranes, deck and balcony systems, and below-grade waterproofing, depending on project requirements and specifications.
Can you meet project deadlines and schedules?
We plan our work around the project schedule and coordinate with other trades to minimize delays. If conditions change, we communicate quickly so adjustments can be made.
How do you handle unexpected site conditions or changes in scope?
We document conditions, communicate with the GC or architect, and propose solutions that align with the spec and performance goals while keeping the project moving.
Do you provide warranty and documentation for installations?
Yes. We provide warranty information and documentation for our waterproofing installations, including progress photos and submittal packages as needed.
What areas do you serve in Southern California?
We serve Orange County, Los Angeles County, and surrounding regions. Please contact us for specific service area inquiries.
Next step
Need a Waterproofing Subcontractor for an Upcoming Project?
If you are evaluating a project, reviewing specs, or preparing for bid, contact us for a direct conversation about scope, schedule, and system options.