Between Slab Waterproofing
Protection sandwiched between structural pours
What between slab waterproofing actually involves
Between slab waterproofing places a membrane between a structural deck and a topping slab, protecting occupied space below podium decks, plaza levels, and multi-family construction. Because the system is buried once the topping is poured, detailing accuracy is everything. We coordinate directly with the concrete crew so terminations, drains, and penetrations are sequenced correctly the first time.
Every project starts the same way: we look at the property, establish what water is doing and where it is entering, and only then specify a system. That order matters — a correctly installed product solving the wrong problem still leaves you with a wet building.
Included in every between slab waterproofing project
- Hot fluid-applied and sheet membrane systems
- Protection course and drainage composite installation
- Penetration, drain, and expansion joint detailing
- Coordination with structural and concrete trades
- Electronic leak detection prior to topping pour
- Documented installation for owner records
Four steps from first call to sign-off
Plan Review
We review structural drawings and joint layout so the membrane detail matches the real conditions on the deck.
Deck Preparation
The structural slab is cleaned, profiled, and dried to the moisture level the specified system requires.
Membrane & Protection
Membrane is installed to spec thickness, then covered with protection board and drainage composite.
Test & Release
Testing is completed and documented before the topping slab is poured over the system.
The difference a properly built assembly makes
Waterproofing is buried work. Once the backfill, topping slab, or tile goes over it, nobody sees the detailing again — which is exactly why the details have to be right the first time.
Diagnosed First
We confirm where water is genuinely entering before specifying anything, so the work targets a cause rather than a symptom.
Matched to Conditions
Substrate, exposure, and water pressure decide the system. The same product is not right for every property.
Prepared Properly
Profiled, cleaned, moisture-tested surfaces. Preparation is where most failed waterproofing jobs actually went wrong.
Tested & Documented
Flood tests, electronic detection, and photo records so you have proof the assembly performs before it is covered up.
Detail-driven from start to finish
Durable waterproofing comes from disciplined habits, not premium product names. Here is the standard we hold ourselves to on every project.
A Written Scope
You get the system, the sequence, and the expected result in writing before work begins.
Substrate Preparation
Grinding, profiling, and repair to a sound surface — never a coating applied over unsound concrete.
Reinforced Detailing
Corners, drains, penetrations, and joints get reinforcement, because that is where assemblies fail.
Site Protection
Landscaping, hardscape, finishes, and adjacent surfaces are protected for the length of the project.
Verification Before Close-Out
Testing under real conditions, then a walkthrough so nothing gets buried on assumption.
Questions, answered
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View Below Grade Waterproofing detailsGet a free estimate for between slab waterproofing
Share a few details about the property and we will come back with clear next steps — usually the same business day.