Exterior Foundation Waterproofing in Old Lyme, CT

Drainage Pro of CT stops water at the source before it ever reaches your foundation wall. We provide exterior foundation waterproofing to homeowners throughout Old Lyme, CT, working exclusively on the outside of your building where foundation water problems actually begin.

Exterior Foundation Waterproofing for Old Lyme, CT Homeowners

Foundation waterproofing conditions in Old Lyme are among the most historically significant and hydrologically complex we address anywhere in our service area. The combination of the town's 17th and 18th century housing stock along the Lyme Street Historic District, the coastal water table conditions that affect the beach communities along Long Island Sound, the tidal wetland influence of the Lieutenant River and Connecticut River estuary, and the varied inland terrain of the northern sections of town means that Old Lyme foundation waterproofing requires a more nuanced diagnostic approach than most other shoreline markets.

Along Lyme Street and in the surrounding historic residential district, the foundation moisture conditions are shaped by the age of the structures as much as by the current drainage conditions on the lot. The colonial and federal period homes that line Lyme Street, some built before the American Revolution, have stone and early brick foundations that were constructed long before modern drainage practices or the concept of hydrostatic pressure management existed. These foundations have been receiving exterior groundwater pressure through every wet season for generations without exterior drainage relief, and the moisture conditions that result are not the intermittent variations of a newer home. They are sustained, accumulated conditions driven by centuries of inadequate exterior water management that only exterior waterproofing at the footing level can address at the source. The Duck River, which flows through the Old Lyme Cemetery before emptying into the Connecticut River at Watch Rock Park, contributes to elevated groundwater conditions in properties near that corridor, adding a constant water source component to the foundation pressure conditions those historic homes are managing.

In the coastal and beach communities of Sound View, White Sand Beach, Old Lyme Shores, Old Colony Beach, and Hawk's Nest Beach, foundation waterproofing conditions reflect the high water table and flat terrain of the Long Island Sound shoreline environment. During the spring season and after extended wet weather, the water table in these neighborhoods rises toward the surface and the foundation perimeter soil stays near saturation for extended periods under the combined influence of seasonal groundwater rise and tidal wetland proximity. That sustained saturation creates hydrostatic pressure against the exterior foundation wall that does not relent until conditions improve, and on flat Old Lyme coastal lots where the soil has no natural drainage path, the pressure periods are longer and more sustained than on properties with natural drainage available. FEMA flood zone designations apply to a significant share of properties in Old Lyme's coastal neighborhoods, which is part of the regulatory context we account for in our assessment and system design.

In inland Old Lyme along Grassy Hill Road, Town Woods Road, and the wooded parcels of the northern sections of town near Rogers Lake and the upper Lieutenant River watershed, foundation moisture conditions often have a directional component from groundwater moving downhill through clay-influenced soils toward lower-lying lots. The uphill foundation walls of homes on these inland parcels are under more sustained pressure than the downhill walls because incoming groundwater concentrates against the uphill side of the structure as it moves through the soil.

Everything we do is on the exterior of your Old Lyme home. We work outside the building, where the problem actually starts.

Signs Your Old Lyme Home May Need Exterior Foundation Waterproofing

Working on Historic Properties in Old Lyme's Lyme Street Historic District

The historic properties along Lyme Street and throughout Old Lyme's established historic neighborhoods require a more careful and deliberate approach to foundation excavation and waterproofing than newer construction. We assess the specific foundation material and condition before recommending any scope of work on these properties, because the membrane system appropriate for a modern poured concrete foundation is not the right choice for a pre-Revolutionary stone or early brick foundation, and the excavation approach needs to account for the age and condition of the existing foundation material to avoid disturbing structure that has survived for centuries.

On historic Old Lyme properties, we are deliberate about excavation depth and equipment selection to minimize disturbance to mature root systems, historic hardscape, and existing landscape features that are part of the property's historic character. We select membrane systems appropriate for the specific foundation material and condition, and we restore the surface to match the existing character of the historic property after the waterproofing work is complete.

If your Old Lyme property is within the Lyme Street Historic District or subject to local historic preservation review by the Old Lyme Historic District Commission, we recommend confirming applicable requirements before any exterior foundation work begins. We work with the homeowner to understand those requirements and design the work accordingly.

How We Waterproof Foundations in Old Lyme, CT

Step 1: Assessment and System Selection

We walk the full building perimeter, assess the existing foundation material and condition, evaluate grade and drainage conditions on your Old Lyme property, and determine the membrane system and installation approach appropriate for your specific property and foundation type. On historic Lyme Street properties this assessment includes evaluation of the existing stone or brick foundation condition and selection of a membrane system appropriate for that specific historic material rather than a standard modern concrete application.

Step 2: Excavation

We excavate along the affected foundation wall to the footing level using equipment and methods appropriate for the specific site conditions and foundation type. Old Lyme's sandy coastal soils in the beach neighborhood communities are generally straightforward to excavate. On inland Old Lyme properties with heavier clay-influenced soils along Grassy Hill Road and the northern ridges, excavation requires more time and different equipment. On historic Lyme Street properties, we use smaller equipment and more manual excavation methods where needed to minimize disturbance to the historic foundation materials and surrounding landscape.

Step 3: Wall Preparation, Membrane, Drainage Board, and Footing Drain

The exterior wall is prepared, a continuous waterproofing membrane appropriate for the specific foundation material is applied to the full treated wall height, a drainage board is installed over the membrane, and a perforated footing drain in drainage stone is placed at the base. On flat Old Lyme coastal lots in Sound View, White Sand Beach, and the other beach communities where no natural daylight outlet is available, discharge routes to a properly sized dry well as part of the installation design. Dry well placement and sizing on these coastal lots accounts for the seasonal water table behavior in Old Lyme's coastal zone.

Step 4: Backfill and Property Restoration

The excavation is backfilled, the surface grade is restored to slope away from the foundation, and landscaping, lawn areas, and hardscape disturbed by the excavation are restored. On historic Old Lyme properties along Lyme Street where the exterior character of the grounds is part of the historic integrity of the property, we take particular care with the finish restoration to ensure the completed installation is visually consistent with the property's historic character.

It Might Be Simpler Than You Think — We Will Tell You Either Way

Not every foundation moisture condition in Old Lyme requires full exterior waterproofing, even on the historic properties of the Lyme Street district where the conditions can appear severe. On many Old Lyme properties, the actual primary source of foundation moisture is a simpler and less expensive exterior correction. Downspouts discharging at the base of a historic stone foundation. Grade that has settled toward the building over decades of frost cycles. A gutter system that overflows and concentrates water against the foundation wall during heavy rain. These are exterior problems with exterior solutions that cost a fraction of full waterproofing, and we identify them before recommending any broader scope of work.

How Much Does Foundation Waterproofing Cost in Old Lyme, CT?

Exterior foundation waterproofing in Old Lyme typically costs between $4,500 and $9,000 for residential properties. Old Lyme's sandy coastal soils in Sound View, White Sand Beach, and the beach communities are generally less expensive to excavate, keeping costs toward the lower end for coastal Old Lyme waterproofing projects where conditions are straightforward. Historic Lyme Street properties with stone or brick foundations requiring more careful excavation and specialized membrane systems, full perimeter waterproofing on larger historic homes, installations requiring dry well discharge on flat coastal lots, and inland properties with heavier soil conditions along Grassy Hill Road and Town Woods Road are toward the higher end of that range.

We provide free on-site estimates with exact pricing before any work begins. Every exterior foundation waterproofing installation we complete in Old Lyme is backed by our 5-year workmanship warranty.

Get Your Free Foundation Waterproofing Estimate in Old Lyme, CT

If moisture is appearing on your Old Lyme foundation wall, you have a persistent damp condition your dehumidifier does not resolve, or you have been managing a foundation moisture problem for years without finding its actual source, we are ready to come out and give you an honest exterior assessment. We will evaluate the conditions specific to your Old Lyme neighborhood and your property and tell you exactly what is causing the problem and what it will take to fix it from the outside. No pressure. No guessing. Just exterior foundation waterproofing in Old Lyme, CT built for your home's specific conditions.