Duncan Wilson Construction



Waterproofing for Decks

We provide waterproofing for walking decks such as urethane decks, neoprene decks that serve as a pre-proof undertile and concrete, and floating wooden decks.


Waterproofing for Foundations

We provide waterproofing for foundations using a variety of products such as neoprene.


General Construction

We provide a variety of general construction services such as rot repair, tiling, and building decks.

About Us

We are a general contracting firm that’s been in business for 26 years. We specialize in waterproofing but do a wide variety of services for our clients. The owner has almost 50 years of experience in construction and has a strong background in all phases of residential construction.

Our knowledge and experience in the building trade enable us to bring added value to any waterproofing job. Our areas of expertise are decks over living space, carports, foundations/foundation walls, and shower pans. We are skilled in demolition, the layout of drains, slope, and flashing details.


Fully Insured and Licensed


Family Owned and Operated


Wide Array of Services Offered


Decades of Experience

Contact Us

Contact us for any of your waterpoofing needs. We are based in San Rafael, CA and are available for work in Marin and Sonoma County, San Francisco, and the East Bay.

locationBased in San Rafael, CA

phoneCall at (415) 302 5542

mailEmail dwcbuild@gmail.com or click here