Frequently Asked Questions RDA is dedicated to providing answers. If you have a question, please feel free to contact us at our office by either email or phone. We are open Monday-Friday, from 8:00am to 4:30pm. Where is RDA Licensed? CaliforniaColoradoDistrict of ColumbiaFloridaGeorgiaIllinoisIndianaKansasMichiganMissouriNebraskaNew YorkNorth CarolinaOhioOklahomaOregonPennsylvaniaSouth CarolinaTexasUtahVirginiaWisconsin See map version. What materials does RDA specialized in? steel, reinforced concrete, precast/post-tensioned concrete, reinforced masonry, wood, cold formed metal framing Do you provide expert witness testimony? Yes.