Below-Grade Waterproofing. Certified. Florida.
Foundation walls. Parking garages. Elevator pits. Tunnels. Planter boxes. We're certified applicators for the three manufacturers that own below-grade waterproofing — and we've proven it underground across Florida.
Three World-Class Manufacturers. One Certified Installer.
We don't sell you a brand. We install the right system for your project — backed by the manufacturer's warranty because we're their certified applicator.
Industry Leader in Below-Grade
- SikaProof A+ — Pre-applied blindside membrane with signal layer for leak detection
- Sikalastic — Liquid-applied waterproofing for foundation walls and split-slab
- SikaProof P — Post-applied sheet membrane for positive-side applications
- Sika Injection Systems — Polyurethane and epoxy crack injection for remedial repair
- SikaBond — Waterproofing adhesive systems for demanding substrates
The Standard in Fluid-Applied
- TREMproof 250GC — Single-component fluid-applied waterproofing membrane
- TREMproof 260 — High-performance hot-applied rubberized asphalt
- Vulkem 350/351 — Traffic-bearing waterproofing for decks and plazas
- Vulkem 116 — Polyurethane sealant for joints and penetrations
- TREMDrain — Drainage composite boards for foundation walls
Sheet Membrane Specialists
- COLPHENE BSW — Self-adhering below-grade sheet membrane
- COLPHENE 3000 — Dual-compound self-adhering membrane for split-slab
- ALSAN RS — PMMA liquid-applied waterproofing (ultra-fast cure)
- SOPRALENE FLAM — Torch-applied modified bitumen for horizontal applications
- SOPREMA Drainage Composites — Foundation protection and drainage
Which System for Which Application?
Every application has an optimal system. Here's what we recommend and why.
| Application | Sika System | Tremco System | Soprema System |
|---|---|---|---|
| Blindside / Pre-Applied | SikaProof A+ ★ | — | COLPHENE BSW |
| Foundation Walls (Positive) | Sikalastic | TREMproof 250GC ★ | COLPHENE 3000 |
| Split-Slab / Horizontal | Sikalastic | TREMproof 260 | COLPHENE 3000 ★ |
| Traffic-Bearing / Plaza | Sikalastic DeckPro | Vulkem 350 ★ | ALSAN RS |
| Crack Injection (Remedial) | Sika Injection ★ | — | — |
| Elevator Pits (New) | SikaProof A+ | TREMproof 250GC | COLPHENE BSW |
| Elevator Pits (Remedial) | Injection + Crystalline ★ | TREMproof negative-side | — |
★ = Ocean Group's recommended first-choice system for this application
Below-Grade Waterproofing Scopes We Handle
Foundation Wall Waterproofing
Continuous barrier from footing to grade. Fluid-applied or sheet membrane systems with drainage board and protection course. Penetration detailing at every pipe, conduit, and tie-hole.
Parking Garage Waterproofing
Traffic-bearing membrane systems that protect the structural slab while handling vehicular loads. Split-slab waterproofing, expansion joint treatment, and concrete crack injection.
Elevator Pit Waterproofing
New construction and remedial solutions. Crystalline waterproofing, negative-side coatings, curtain grouting with polyurethane injection resins, and sump pump integration.
Planter Box & Amenity Waterproofing
Resort pools over parking garages. Rooftop planters over occupied space. Multi-layer assemblies with root barriers, drainage composites, and traffic coatings.
Tunnel & Utility Vault Waterproofing
Blindside and positive-side systems for structures that can't be accessed after backfill. Designed for continuous hydrostatic pressure in Florida's high water table.
Remedial Injection & Repair
Active leak repair without excavation. Polyurethane and epoxy crack injection, curtain grouting, negative-side cementitious coatings, and crystalline waterproofing.
Not Just a Roofer Who "Also Does" Waterproofing
We have dedicated waterproofing crews, manufacturer certifications, and the equipment to handle the hardest scopes in the state.
Manufacturer Certifications
Manufacturer-certified / approved applicator: Duro-Last · Carlisle · Versico · GAF · Mule-Hide · RhinoBond · R.M. Lucas · ALDO · Firestone · Tremco · Sika.
Warranty Capability
No Dollar Limit manufacturer warranties available through our certified applicator status.
Dual Licensed
CCC1332364 (Roofing) + CGC1504639 (General Contractor). Both. Not just one.
Florida Expertise
Limestone substrate, 2-4 ft water table, hurricane rain loads. We know what fails here and why.
Bid Turnaround
Below-grade is on the critical path. We don't sit on bid requests. 48 hours or less.
Detail Obsession
90% of waterproofing failures happen at transitions, penetrations, and terminations. That's where we focus.
Below-Grade Waterproofing Questions
How is a below-grade waterproofing system selected?
System selection depends on substrate, access, hydrostatic pressure, sequencing, drainage, and the occupied spaces being protected. The specification should fit the building condition and be installed within the approved manufacturer path.
Why do manufacturer certifications matter?
Manufacturer warranties — especially NDL (No Dollar Limit) warranties — are only available when the system is installed by a certified applicator. If a non-certified contractor installs Sika or Tremco products, you get zero manufacturer warranty. The product warranty is void. Our certifications protect your building owner's investment.
What is blindside waterproofing?
Blindside (pre-applied) waterproofing is installed against the earth retention system (sheet piling, soldier piles, shotcrete) BEFORE the structural concrete is poured. The concrete bonds directly to the membrane. It's used when there's zero access to the exterior of the foundation wall after construction — common in urban and high-density Florida projects.
How much does below-grade waterproofing cost?
Pricing depends on access, substrate, water source, excavation, preparation, selected system, drainage, detailing and whether work is new or remedial. Contact OGC for a project-specific scope.
Can you fix a building that's already leaking below grade?
Yes. Remedial waterproofing is a core service. We use negative-side cementitious coatings, polyurethane injection, curtain grouting, and crystalline waterproofing to stop active leaks without excavation when possible. For severe cases, we coordinate excavation and positive-side membrane application.
Scope Your Below-Grade Waterproofing Project
OGC is a manufacturer-certified / approved applicator for Duro-Last, Carlisle, Versico, GAF, Mule-Hide, RhinoBond, R.M. Lucas, ALDO, Firestone, Tremco, and Sika.