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| ||style="text-align:center;" | '''Masonry'''
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| || All the stone must be of the best quality of Red Sandstone of the district all good sound hard stone of equal quality and such as shall receive the approval of the Engineer.<ref group="note">In May 1875 the appointed contractor, Charles Dickinson, wrote to the GWR explaining his difficulty in obtaining suitable stone for the piers of the viaduct Falling Sands Viaduct and requesting the difference in price for it to be built entirely of brick, to which the GWR agreed.</ref>
The foundation courses of Viaduct and Bridges shall consist of large flat bedded stones laid close together bedded and filled with mortar and brought up to a level surface to receive the masonry of the walls above and the whole work shall be executed in accordance with the drawings applicable to each structure and with the figured dimensions marked thereon.
The masonry shall consist of good flat bedded rubble work lead in level courses (which may be broken) with vertical joints. All the stones used shall be sound and free from shakes and dries laid on their natural beds closely set and bedded and pointed flush in lime mortar.
Great care must be taken in building the piers of [[Falling Sands viaductViaduct|the Viaduct]] to bond the work thoroughly together by means of bond stones of sufficient length to pass through the whole thickness of the piers at such frequent intervals as the Engineer may direct, and no stone shall measure less in the face then 2 feet 6 inches on bed and 1 foot in height.
For abutments and wings of bridges the stones in face shall not be less than 1 foot 6 inches on bed and 9 inches in height and good bond shall be made throughout the whole thickness of all stonework, the lap being in no case less than 8 inches and in every superficial yard of face or back there shall be at least two headers of not less than 3 feet 6 inches in length Internal angles of counter-forts, voids, wings &c shall have proper bond stones alternately out and in bond of sufficient length and at least once in every 3 feet in height they shall be stones bonding each way not less than 3 feet 6 inches in length
