Location
69 Paul Drive
San Rafael CA 94903
Office hours
Mon – Sat 8:00 AM – 6:00 PM
Sun – Closed
Call us Today
415-785-7522
Location
69 Paul Drive
San Rafael CA 94903
Office hours
Mon – Sat 8:00 AM – 6:00 PM
Sun – Closed
Call us Today
415-785-7522
Call us Today
415-785-7522
Waterproofing & Leak Repair Marin County
Water finds every gap a structure offers it, from a hairline crack to a failed seam to a slope that’s gone flat over time. As a waterproofing contractor in Marin County, I Construction & Structural Inc. tracks down exactly where that water is getting in and fixes it at the source, covering everything from balconies and parking decks to foundations and retaining walls.
Keep Water Out. Protect Your Marin County Property
Water intrusion rarely announces itself right away. It first shows up as a stain, a soft spot, or a faint smell, long after the damage has already started. Our waterproofing services in Marin County at I Construction & Structural Inc are built around catching that source early: balcony and deck membranes, concrete wall repairs, drainage corrections, retaining walls, and basement waterproofing, each one starting from a hands-on look at the area that’s actually failing.
Our Services
No two waterproofing jobs look the same, because no two properties fail the same way. Whether the issue is a leaking parking structure or a wall pushing water into a finished room, building waterproofing in Marin County starts with tracing the path water is actually taking, not guessing at it.
Balcony & Parking Deck Waterproofing
Balconies, roof decks, and parking structures absorb more standing water and foot or vehicle traffic than almost any other surface on a property, which is exactly why they tend to fail first. Much of what falls under roof waterproofing in Marin County is really this same category of work, since a roof deck and a balcony share the same membrane, seams, and drainage challenges.
- Torch-down membrane installation for balconies, roof decks, and parking structures
- Sealing at seams, edges, and transition points where leaks typically start
- Repair or full replacement of membrane systems that have already failed
- Sloped drainage design that moves water away from the structure
- Flood testing after installation to confirm the surface is watertight
Concrete Wall & Structural Leak Repairs
A concrete wall letting water through is rarely a small, contained problem. It tends to spread into moisture damage, mold, or worse the longer it sits. Because so many of these leaks originate below grade, foundation waterproofing in Marin County is often part of the same repair, not a separate project.
- Exterior excavation to expose the source of water entry
- Waterproof membrane or coating applied directly to the concrete wall
- Crack injection and sealing at structural leak points
- Drainage system installation to redirect water away from the foundation
- Interior moisture checks to confirm the repair actually holds
Retaining Wall & Basement Waterproofing
Retaining walls and basements rarely respond to the same fix, since grading, soil, and drainage conditions shift from lot to lot across Marin. Residential waterproofing in Marin County almost always starts the same way regardless of the structure involved: figure out how water is reaching the wall before deciding how to stop it.
- Exterior waterproof coating or membrane application
- French drain or perimeter drainage installation
- Grading adjustments to redirect surface water away from walls
- Crack and joint sealing on retaining and basement walls
- Sump pump integration when a site needs additional drainage support
Our Waterproofing Work Marin County
Concrete Wall Waterproofing & Drainage
A homeowner was dealing with water seeping through a concrete wall and into a finished living space. We excavated the exterior wall, applied a waterproof membrane, and tied in a complete drainage system to keep water from building back up against the wall.
Balcony Waterproofing
These photos show membrane going down across a balcony deck and around its perimeter, before the final surface finish was installed on top.
Flood Testing After Waterproofing
After finishing this balcony, we flooded the surface to run a full leak test to confirm there was no water intrusion before the project moved into its final phase.
Why Choose I Construction?
Steep Grade Lots
A large share of Marin’s residential lots sit on slopes between 20 and 60 percent grade, and waterproofing on terrain like that has to account for how water actually moves downhill across a property, not just where it collects at the surface.
Soil and Geology
Soil conditions shift dramatically between Marin communities. The fill soil, expansive clay, and serpentine bedrock all behave differently once water gets into the picture. Reading that correctly is part of what separates a lasting repair from a water leak repair in Marin County that only holds for a season or two.
Marin County Permitting
Permit requirements shift depending on whether a project falls under the Marin County Community Development Agency or an individual city building department. We’ve worked through both processes long enough to know what each one expects before submitting.
Have a Leak That Needs Attention?
Water coming through a wall, dripping off a balcony edge, or pooling somewhere it shouldn’t is worth a call, not a guess. If you’re already searching for leak repair in Marin County, send us photos of what you’re seeing and roughly where it’s happening, and we’ll help you figure out the right next step before it becomes a bigger job.
Frequently Asked Questions
How do I know if I need waterproofing or just a leak repair?
If water is already coming through, a leak repair deals with that specific entry point. Waterproofing is the broader, preventive layer that keeps future water from finding a new way in, and most of our projects end up including both.
What is a torch-down membrane, and why do you use it on balconies and roof decks?
It’s a heat-applied waterproofing layer that fuses into a single, seamless barrier across a surface. It holds up under foot traffic, parked vehicles, and constant weather exposure, which is why it’s the standard choice for balconies, roof decks, and parking structures alike.
Do you handle waterproofing for both homes and larger buildings?
Yes. Residential waterproofing in Marin County makes up a large share of our work, but the same core methods like membranes, drainage, and crack sealing apply to multi-unit and commercial buildings as well. The scale changes; the underlying approach doesn’t.
How long does a typical waterproofing project take?
It depends on the size of the area and how far the damage has spread. A single balcony or wall section might take a few days, while a project involving excavation and a full drainage system will run longer. We give a real timeline once we’ve seen the site.
Do you flood test after waterproofing is finished?
Yes. We saturate the waterproofed surface with water and check for any sign of leaking before the final finish goes down. It’s a simple step, but it’s the difference between assuming a repair worked and actually confirming it.
What usually causes water to come through a concrete wall?
Most of the time it’s a crack, a cold joint, or a spot where waterproofing failed or was never applied correctly to begin with. Soil and drainage conditions around the wall also affect how much pressure is pushing water toward that weak point.
Can foundation waterproofing prevent bigger structural problems down the line?
Catching water intrusion early goes a long way toward avoiding wood rot, mold, and soil erosion near the foundation. Foundation waterproofing in Marin County is usually one piece of a larger plan that includes drainage work around the structure.
Do I need a permit for waterproofing or leak repair work in Marin County?
It depends on the scope. Anything involving excavation, structural repair, or a new drainage system typically needs a permit through the local building department, and we manage that process as part of the project.
What should I do if I notice a water stain or a leak somewhere in my home?
Reach out as soon as you notice it. Water problems rarely stay small if they’re left alone. Send us a few photos and a general idea of where it’s happening, and we can help map out what’s actually going on.
Get in touch
No Obligation Consultation
No obligation, no pressure, consultation allows you to find out for yourself and decide based on knowledge.
Friendly Crew
We know we are working for you and do our best to make sure you are 100% satisfied with our work.
Safety First
With over two decades of experience we place your safety above all else. All plan and projects take this as first priority.
About us
We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of contracting services customizable to each individual project.
Contact us
I Construction & Structural Inc
69 Paul Drive
San Rafael CA 94903
Office: 415-785-7522
Service: 415-424-5969
Fax: 415-785-7137