SDI : Building Efficiency for over 35 years.

Steve DeLorenzi is the CEO and President of the Bay Area Insulation Company; SDI Insulation Inc. His career in construction began when he was 17 years old working on U.S. Navy and Coast Guard ships for American Bridge, U.S. Steel as a boilermaker at the Hunter’s Point shipyard in San Francisco. His second profession was blowing attic insulation into homes in the Bay Area. As a result of this endeavor, Steve’s interest in energy conservation took shape. He eventually left the shipyards to pursue that interest full-time and open SDI Insulation, Inc. – a full service insulation contracting company providing batt and blown insulation for residential and commercial applications.

Steve went on to become a noise control specialist and a San Francisco Energy Inspector, working with local utility companies. Environmental awareness has always been important to Steve and led him to pursue “Going Green”. SDI Insulation became a licensed spray foam insulator in 2005 and opened a branch office in Sacramento, California. Currently, to stay abreast of new products and applications, Steve attends trade shows, home shows and industry seminars. In the insulation industry for more than 30 years Steve’s vision for SDI Insulation includes becoming California’s leader in “Green Building” applications.


Our commitment to environmentally aware building practices requires us to constantly search for new products that are on the cutting edge of the “green” building market. As one of the largest Bay Area Insulation Companies, we regularly attend trade shows, seminars and conventions, looking for the best products for you and our environment. If a product is of interest to our green building staff, we do our research, make the connections, train our work crews and become a licensed dealer. Stay tuned to our website to learn about the new green products that we will be offering in the future.

Our Mission

At SDI we value our customers in the highest regard. Our estimating department will provide you with the best possible advice for your construction concerns. We will work with your budget to provide an estimate for your upcoming project, and are up to speed with Title 24 changes in the industry. Our office staff is ready to schedule your job and answer any of your questions. We learn from every job, and take that experience to the next project. We hope to add you to our list of 35 years worth of satisfied customers.


Our crews have unlimited knowledge of specialized insulation equipment, work efficiently as a team, and take pride in their installations. To the SDI Family, it’s not just a job, it’s their job.