Ohio Self-Insurers Association Laura Kaiser Installed Building Products 495 S. High Street, Suite 50 Columbus, OH 43215-5689 Phone: (614)221-3382 Email: lkaiser@installed.net   OSIA P.O. Box 09600 Columbus, OH 43209-9600 Phone: (614)470-2246 Fax: (614)340-5315   Click below to download the OSIA Membership Application form.