About DWC

DWC is a family-owned and operated general contracting company specializing in waterproofing. With over 16 years of dedicated waterproofing experience and an additional 34 years in general construction, we bring unmatched expertise to every project we take on.

As seasoned experts in all phases of residential construction, we go beyond surface-level fixes. Our background as general contractors allows us to spot structural and design issues early—preventing leaks before they happen and accurately identifying the source of existing ones.

We specialize in waterproofing for a variety of walking deck systems, including:

• Urethane decks
• Neoprene decks (as a pre-proof layer for tile and concrete)
• Floating wooden decks

Our core waterproofing expertise includes decks over living spaces, carports, and shower pans. We take pride in our attention to detail, from slope and drain layout to flashing and finish work—ensuring lasting protection and peace of mind.

In addition to waterproofing, we offer a range of general construction services such as tiling and deck repair. DWC delivers quality you can trust and craftsmanship that stands the test of time.

We are based in San Rafael, CA but service all of Marin County and the Bay Area.