Foundation Waterproofing Longboat Key
Engineered waterproofing for Longboat Key estates, bayfront residences and island properties, designed for tidal groundwater and salt air and backed by a lifetime transferable warranty.
Gulf of Mexico Drive ◆ Sarasota Bay ◆ Bay Isles ◆ Founded 2015
Quiet, Clean Waterproofing for Longboat Key Estates
Longboat Key homes are built to a high standard, and the waterproofing should be too. Between the Gulf and Sarasota Bay the water table sits just below the surface and moves with the tide. We protect elevator pits, garages, wine rooms, pool decks and at-grade slabs with systems that are concealed, documented and built to last.
The key spans two counties, and we coordinate every project with the Town of Longboat Key and its flood rules.
Every system we install carries a Lifetime Transferable Warranty. That matters at resale, because known water problems have to be disclosed when a Florida home is sold. Warranty transfer details.
Why Longboat Key Properties Need Engineered Waterproofing
Tidal Groundwater
The water table under the key rises and falls with the Gulf and the bay, pressing on slabs and pits every day.
Elevator Pits & Ground Levels
Elevated waterfront homes still have elevator pits, garages, pool equipment rooms and ground-level enclosures that sit in or near the water table.
High-Value Finishes
Stone floors, millwork and wine storage leave no room for moisture coming up through the slab.
Salt Air & Water
Salt attacks concrete and reinforcing steel, so keeping water out of the structure protects the building itself.
2024 Storm Season
Hurricane Helene pushed storm surge across the Gulf barrier islands in September 2024, and Hurricane Milton made landfall near Siesta Key two weeks later, a reminder of how fast water rises here.
Proactive Waterproofing
Perimeter collection, sump discharge and wall waterproofing, installed before damage spreads, save owners the cost of floors, finishes and mold remediation later.
Gulf-front estates and bayfront neighborhoods
How Water Gets In on Longboat Key
Longboat Key is a long, narrow barrier island of sand and shell. Fresh rainwater sits on top of salt water a few feet down, and the whole water table rises with the tide and with storm surge.
Elevator pits, garages and at-grade rooms sit in that zone. Water finds pit floors, wall joints, conduit and plumbing penetrations and aging slab vapor barriers.
Our systems are designed for constant moisture: sealed pits and walls, collection and sump relief where the site allows, and roof and deck water carried away in solid lines.
FEMA maps Longboat Key in high-risk flood zones, with VE zones along the Gulf and AE zones along Sarasota Bay and the canals. You can look up any address on FEMA’s Flood Map Service Center. Keep in mind that a flood zone shows surface flood risk; groundwater pushing up under a slab happens inside and outside the mapped zones.
Protecting Estate Value & Closing Florida’s Code Gap
The Florida Building Code’s waterproofing provisions are written mainly for below-grade walls such as basements. When a below-grade structure is proposed, building officials generally look to those provisions and the International Building Code. They say very little about the condition most Longboat Key homes are in: a slab on grade sitting close to the seasonal high water table. A home can pass every inspection and still take on water from below.
Our engineered systems fill that gap, and every installation carries a Lifetime Transferable Warranty, documented proof for the next buyer that the water problem was solved correctly.
Engineering, when a project calls for it, is provided by Foundation Masters, LLC, Florida Certificate of Authorization CA# 30969.
Our Longboat Key Waterproofing Systems
Perimeter Collection
Collection lines along the footing that intercept groundwater before it reaches the slab.
French DrainsSlab Moisture Control
For wet grout lines, cupping wood floors and moisture rising through the slab.
Floor CuppingSite and Stormwater Drainage
Runoff captured across drives, pool decks, courtyards and garages and carried to a proper discharge point.
Drainage ProblemsBelow-Grade Waterproofing
Lower levels, basements and below-grade rooms, with interior channels and sump discharge.
Basement WaterproofingRoof Water Management
Seamless gutters tied into smooth PVC drain lines, so roof water never reaches the foundation.
Gutters and DrainageCommercial Water Intrusion
For owners and developers of hospitals, hotels, schools, offices and retail: rear doors, shared walls and slabs, scoped to keep the building open.
Request a ConsultationCommon places water gets in
Longboat Key Waterproofing FAQ
Can you waterproof an elevator pit or wine room on Longboat Key?
Yes. We seal pit and room floors, walls and penetrations and add relief where the site allows, so the space stays dry in tidal groundwater.
Will the work disturb my landscaping and finishes?
We plan the work to protect hardscape, landscaping and interiors, and we finish to match the property. Most of our systems are completely concealed when we are done.
Do you coordinate with the Town of Longboat Key?
Yes. We confirm permit and flood requirements with the Town of Longboat Key before work starts.
How much does waterproofing cost on Longboat Key?
Elevator pit and room work is usually smaller in scope. A full slab and perimeter system on an at-grade estate typically runs $20,000 to $40,000 or more, depending on size and access.
Do you offer private consultations on Longboat Key?
Yes. Call 813-614-4830 or send the form below to schedule a private, no-cost inspection.
Also serving Longboat Key
Water where it should not be?
Tell us about the property and what you are seeing. We will arrange a visit at your convenience.