Solid type construction is construction in which all bearing walls, beams, columns, floor slabs, and roof consists of marble or granite blocks, in solid form, pinned with non-corrosive structural metal pins as hereinafter described. The foundations and footings shall be of poured-in-place reinforced concrete designed and constructed in conformity with the Uniform Building Code. All bearing walls, beams, columns, floor slabs, and roof shall be constructed in conformity with the requirements set forth in the Uniform Building Code, except as otherwise provided in this section. Structural members shall be not less than six inches (6″) thick, if of granite construction, and eight inches (8″) thick, if of marble construction. Each structural part shall be properly pinned and anchored to each other structural part. All vertical joints shall be pinned a maximum of thirty-six inches (36″) on centers, with pins a maximum of eighteen inches (18″) from a horizontal joint, or pinned with one pin per joint section, whichever spacing is smaller. All horizontal points shall be pinned a maximum of twenty-four inches (24″) on centers, or in the case of wall slabs of width greater than twenty-four inches (24″), each slab shall be pinned to roof and floor with at least two pins. No pins shall be closer than four inches (4″) to the corner of a stone. Pins shall be bronze, stainless steel or other non-corrosive structural metal, at least three-fourths inch (3/4″) in diameter and six inches (6″) long. Pins shall be properly grouted in one (1″) holes drilled to a minimum depth of three inches (3″), except the foundations, where they shall be set in place when the concrete is poured. Each course shall be properly grouted solid. All joints services shall be properly roughened to give the binding surfaces a roughness necessary for proper binding. At all vertical joints there shall be proper cramps at each joint line of a similar non-corrosive variety. No course shall be less than eighteen inches (18″) in height, and thirty-six (36″) in length. The roof stone shall be pinned to the side walls. All joints shall be large enough to allow for expansion and contraction, and shall be raked at least one-half inch (1/2″) deep, unless constructed of single slabs. Where granite or marble roof is constructed of more than one piece, and pitch is three inches (3″) per twelve inches (12″) or less, up-slope pieces must overlap down-slope pieces by a minimum of eight inches (8″). For pitches more than three inches (3″) to six inches (6″) per twelve inches (12″), this minimum overlap shall be four inches (4″). For a slope steeper than six inches (6″), this minimum overlap shall be one and one inches (1 1/2″). Where granite or marble roof stone is level or nearly level, and terminated in a vertical joint on one or more sides, this vertical joint shall be protected by a superimposed cap, along whose edge a drainage trough shall be cut in the roof stone of such size and slope as to prevent moisture from entering the bed joint between roof stone and cap. All interior and exterior fastenings for hangers, clips, doors, and other objects shall be of copper base alloy, aluminum, copper, or stainless steel of adequate gauges. All exterior metals used for doors, window frames, skylights, gutters, downspout, flashing, or in embellishment shall be of copper, copper-based alloy, aluminum, or stainless steel of gauges structurally determined.