About us. Interstate Roof Systems Consultants (IRSC) is a small business located in New Berlin, WI. We also have offices located in Elgin, IL and Denver, CO. We have been providing expertise related to water entry issues with roof systems and building envelopes across the country since 1999. We work with property owners and managers to make sure that their building assets and people are safe by providing unbiased assessments and solutions in the ...
