About Us

Your Trusted Building Envelope Consultants

Van Dijk & Associates, Inc. utilizes 40 years of roofing and waterproofing experience, combined with knowledge of the industry’s ever changing technology, to provide our clients with long lasting and cost effective solutions to their roofing and waterproofing needs.

Our affiliation with internationally recognized consulting companies worldwide, secures ongoing updates in technology related to roofing and waterproofing.

Consulting Solutions

Van Dijk & Associates, Inc. offers the services of experienced and trained consultants who have been involved in the roofing, decking, and waterproofing industry for numerous years. Our consultants do not accept shortcuts. Van Dijk & Associates, Inc. believes in supporting a high quality approach to roof restoration and strongly advises clients to utilize a maintenance program that will extend the life of their roofing and/or waterproofing system.

Evaluation Surveys & Reports

Get help prioritizing your project’s needs. You’ll receive clear recommendations and budgets to make your decision-making process easier, and ensuring a watertight solution. Trust us to guide you toward optimal outcomes.

Customized Specifications

Harness the latest technology and materials for your project’s unique requirements. We’ll help optimize cost-effective solutions with tailored specifications, providing you with accurate and detailed guidance.

Quality Assurance Inspection

Ensure your project adheres to your specifications with our vigilant inspection experts. You’ll receive regular progress reports and a comprehensive record for your peace of mind and quality assurance.

Expert Witness

Leverage our vast knowledge and experience for your roofing and waterproofing litigation needs, ensuring your case’s success—whether you are a plaintiff or defendant.

Maintenance Program

Extend the life of your roofing system. Our skilled technicians detect potential issues promptly, safeguarding your roof from costly premature failures.

A Greener Future with Efficient Buildings

Van Dijk & Associates, Inc. assists their clients in providing the most energy efficient method to roof construction to minimize heating and cooling cost and to assist in providing a more environmentally friendly building.

Global Partners

Our Satisfied Clients


“Over the 27 years that I have known and utilized VDA’s services they have proven to be trustworthy, loyal, honest, friendly and professional. VDA has great knowledge of all roofing and waterproofing materials, applications, repair recommendations and it also has access to manufactures literature. VDA also has superior knowledge of building codes and manufacturers recommendations for all roofing and waterproofing aspects of construction.”


“Van Dijk & Associates has provided waterproofing, building envelope and roofing consulting services on many Projects for Holland Partner Group, with the most recent being the Apex Phase II project, a mixed-use high-rise project located in downtown Los Angeles, CA. I highly recommend Nils and his team at Van Dijk & Associates for any project and look forward to working with them on more projects in the future.”


“Van Dijk & Associates has provided waterproofing and building envelope consulting services to Red Oak Investments and its principals at multiple development sites, including at our current project Baker Block, a 240-unit residential development under construction in Costa Mesa, CA. We find the firm to be reliable, qualified, and easy to work with in their inspections and reviews of waterproofing-related work.”