In order to determine the suitability of alternate materials and methods of construction, to provide for reasonable interpretations of this code and to hear appeals from orders issued by the city’s building official, the board of appeals created pursuant to Ordinance No. 351-75 shall hear these matters. Appeals from written orders of the building official must be filed within thirty calendar days from the date of receipt of the written order by the aggrieved party. Such time limitation shall not apply to oral orders or directions given by the building official. The aggrieved party shall cause to be made at the aggrieved party’s own expense any tests or research required to substantiate the aggrieved party’s claim. (Ord. 1251-86 § 10, 1986.)