Foundation Waterproofing Siesta Key
Engineered waterproofing for Siesta Key beach homes, canal-front estates and island businesses, built for tidal groundwater and backed by a lifetime transferable warranty.
Siesta Key Village ◆ Crescent Beach ◆ Point of Rocks ◆ Founded 2015
Waterproofing Built for Siesta Key
Siesta Key’s quartz sand drains fast, but the water table underneath is only a few feet down and moves with the tide. Original key cottages sit on slabs at grade, and new elevated homes have elevator pits, garages and enclosures at ground level. When the water rises, all of them feel it.
Siesta Key is in unincorporated Sarasota County, and we coordinate every project with the county’s building and 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 Siesta Key Homes Take On Water
Tidal Groundwater
Groundwater under the key rises and falls with the Gulf, Little Sarasota Bay and the canals.
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.
Older Key Cottages
Many original homes were built on slabs close to grade, long before modern moisture control.
Canal-Front Lots
Homes on the canals see groundwater rise from the water side as well as from below.
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 homes and canal-front estates
How Water Gets In on Siesta Key
The key is a barrier island of fine sand between the Gulf of Mexico and Roberts Bay and Little Sarasota Bay. Rain soaks in almost instantly, which keeps the beach dry but raises the water table under the homes.
That water pushes up through slab joints, cracks and penetrations, and into elevator pits and ground-level rooms. Storm surge and king tides push it higher still.
We design for the tide: sealed slabs, pits and walls, collection and sump relief where the site allows, and roof water carried away in solid lines.
FEMA maps Siesta Key in high-risk flood zones, with VE zones along the Gulf and AE zones along the bays and 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 Island Property & 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 Siesta 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 Siesta 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
Siesta Key Waterproofing FAQ
Do elevated Siesta Key homes need waterproofing?
Often, yes. Elevator pits, garages, storage enclosures and pool equipment rooms sit at ground level, where tidal groundwater and storm water reach them.
Can you waterproof an older Siesta Key cottage on a slab?
Yes. Older at-grade homes are where we see the most wet floors on the key. We trace the water and design a slab and perimeter system for the site.
Do you coordinate with Sarasota County?
Yes. Siesta Key is in unincorporated Sarasota County, and we confirm permit and flood requirements with the county before work starts.
How much does waterproofing cost on Siesta Key?
Elevator pit and enclosure work is usually smaller in scope. A full slab and perimeter system typically runs $20,000 to $40,000, depending on the home and access.
Do you offer free inspections on Siesta Key?
Yes. Call 813-614-4830 or send the form below. We find where the water is coming from and give you a written plan.
Also serving Siesta 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.