All signs exceeding eight square feet in area and exceeding five (5) feet in height measured from ground to the top of the sign shall be made of material to withstand, and mounted and constructed to withstand, a wind load of thirty (30) pounds per square foot. Such plans shall be certified and sealed by a professional engineer, unless waived by the Director of Public Safety. All signs shall meet or exceed the requirements of Ohio Basic Building Code Article 29, Section 2907.0.