Drainage, Waterproofing & Basement Services in the Bay Area

Bay Area homes face some rather unique waterproofing challenges. We have rainy winters, old drainage systems, and clay-heavy soils. Or, in other words, a recipe for disaster. 

This is only going to get worse as well. Sea levels are rising and scientists have even predicted a “wetter future” for residence in the area. 

For homeowners, property developers, or investors, this means that proper drainage and basement waterproofing are essential. It’ll guarantee your foundation remains structurally sound, helping you combat seismic and other weather-related risks in the Bay Area. 

Common Drainage Issues in the Bay Area 

Despite the beauty of the Bay Area, it presents some unique issues regarding drainage. These include: 

Heavy Storm Runoff 

The Bay Area is prone to powerful rainstorms, particularly during winter atmospheric river events. 

When this happens, rainwater rushes off roofs, driveways, sidewalks, and other hard surfaces faster than the ground can absorb. 

Improper drainage, whether it’s poorly designed or damaged, can cause severe flooding in yards, basements, and crawl spaces. 

Poor Grading and Drainage 

Many older properties in the Bay Area also have insufficient slope to carry water away from the house. 

Sometimes, ground slopes towards a property, from a driveway, patio, garden bed, etc., causing pools of water to appear alongside your house. Add broken or clogged gutters or downspouts to the mix, and this problem is even worse. 

If this happens, water could flood into your home. It can also deteriorate the foundation if it settles into the ground over a period of time. 

Clay Soils & High Water Table 

Much of the Bay Area is built on clay-heavy soil, which, unfortunately, doesn’t drain well. 

After a heavy downpour, these soils become saturated and hold water close to the surface. Sometimes, this results in the groundwater table rising as high as the basement floor. However, even a few inches of underground water can cause problematic basement flooding. 

Alongside this, for coastal neighborhoods, sea levels are rising. This is causing groundwater to rise toward the foundations, making them more prone to flooding, and can cause cracking, efflorescence, delamination, spalling, etc.

Perched Groundwater and Hillside Homes

If you own a property in a hilly area, layers of water can get trapped above denser clay layers underground. 

This is referred to as “perched water”. When this happens, it tends to seep downhill toward homes near or built on a slope. If this occurs, you can experience constant moisture or seepage through your training walls or basement unless you have proper drainage. 

Our Drainage & Waterproofing Services 

At Avant-Garde, we’re an all-in-one contractor, offering a range of services to help improve property drainage and waterproofing. 

Drainage Designs 

Every single property in the Bay Area is unique. That’s why we offer complete custom drainage design. This is tailored to your specific lot’s slope, soil type, and structural layout.

While developing this design, we consider both surface solutions and the landscape of your property, for example, grading, gutters, downspouts, and catch basins. We also ensure your property is following the proper California Residential Codes for drainage. 

By offering such a service, it ensures our customers get a proper drainage solution for their property. 

French Drain Installation 

French drains are a superb way of managing groundwater while improving your property’s curb appeal and visual aesthetics. 

We install such systems by digging a trench, lining it with filtration fabric, placing waterproof membrane against the foundation, then installing gravel and perforated pipes that redirect water away from your property. 

These are ideal for a range of homes. Whether you’re experiencing basement seepage, high water tables, or lateral water pressure against retaining walls, these are the perfect solution. 

Sump Pump & Dry Wells 

A sump pump is an excellent solution if your basement sits below the local water table or has ongoing water intrusion. 

With these, we install a sump basin and fit it with a pump. The pump then ejects the captured water through pipes underground out to the street gutter.

For homes with low points away from the home, dry wells are superb. These are buried tanks in your yard that collect and slowly disperse the waters below-grade. Grading is important for this to work as it relies on gravity vs electricity and a pump.

Both services offer a similar solution. They take water from vulnerable areas and transport it somewhere safe, so it doesn’t damage your property. 

Basement Waterproofing 

By using exterior and interior waterproofing methods, our team can help protect your basement from water ingress. 

For exterior basement waterproofing, we excavate around the foundation of the property. Once completed, we apply waterproof membranes then French drains that block water at the source. 

On the other hand, waterproofing basement interiors involves applying penetrating, crystalline sealants. 

Both services are extremely important, especially for older Bay Area homes. They help keep your basement dry, mold-free, and usable. 

Basement Dig-Outs 

If you have a low-ceiling or damp basement, we can also perform complete dig-outs. This can convert it into a livable area and ensure your basement is built following the best waterproofing practices. 

During this process, we excavate downwards, install new concrete footings and walls, and fully waterproof the new basement level. This is the perfect solution for anyone looking to expand their property downwards instead of upwards. 

Why Drainage Design Should Be Customized 

No two Bay Area lots are alike. Some neighborhoods are built on sandy uplands with quick drainage, while others are in clay soil areas that retain water. Not only this, but a property on a steep hillside lot needs much different drainage than an urban flat lot. 

Because of this, your property needs a bespoke drainage design. This will ensure that no matter your soil type, current drainage setup, property grading, etc., you’ll have a sufficient system that can direct water away from your property. 

Risk of Delaying Waterproofing

If you have waterproofing issues, delaying action can lead to serious problems. For example: 

• Mold Growth and Poor Air Quality
• Structural Damage to Your Home
• Decreased Home Value and Increased Costs
• Health Risks from Mold and Humidity

The longer you wait, the worse the problem will become. That’s why you need to act today. The initial cost will far outweigh the future expenses. 

Why Choose Avant-Garde 

At Avant-Garde, we’re the go-to local Bay Area waterproofing contractor. We understand the region and bring decades of experience to every project. 

Bay Area Expertise 

We know the local soils, microclimates, and code requirements (like CBC Title 24) inside and out and back to front. Our team has handled drainage, waterproofing, and basement services in all major cities, from San Jose to Marin & beyond, ensuring our customers’ properties stay dry. 

Full-Service Integration 

Our comprehensive services are why our customers call us a ‘one-stop’ contractor for foundations and waterproofing. From the initial visit to the design and installation, we’ll handle every step of the project, from grading to permitting, pumps, structural work, and more. 

Clear Communication & Compliance 

Through every step of the project, our customers will be well-informed. We’ll use detailed assessments, itemized recommendations, and drawings so you fully understand the scope of work. Alongside this, we’ll strictly follow the California Building Code standards for dampproofing and drainage.

Local, Licensed Team 

The Avant-Garde team is as local as you. We live, work, and breathe the Bay Area. We are fully licensed, insured, and follow all laws— even those regarding taxes and employee classification (often ignored by “the other guys”). Therefore, you can trust our team to fulfill the work you require. 

Service Areas

We serve the entire San Francisco Bay Area for all our services. This includes drainage, waterproofing, basement, and various other services. 

Our team manages the following areas from our headquarters in San Leandro: 

• Alameda
• Contra Costa
• Marin
• Napa
• San Francisco
• San Mateo
• Santa Clara
• Solano
• Sonoma

As you can imagine, the distance from the HQ to the project will reflect on pricing. 

Contact Us Today 

Don’t wait until the next storm to flood your basement or the next foundation crack. Protect your home, property, and investment today with professional drainage and waterproofing. 

Contact our team at Avant-Grade for a professional consultation and let us evaluate your project, explain your options, and give you and your home the proper care you deserve.