379. - External Stone Walls. - Rubble

Build the external walls (in first story) of rubble from the --------- quarries. To be laid random, with hammer-dressed joints, and the outside face split so that the projection shall not exceed 2 inches. The stones to be laid on their natural bed, with good vertical bond, and to be one through stone in every 10 square feet of wall. All stones showing on the exterior to be selected from the largest in the pile, and as few spalls to be used as possible. Every stone to be well bedded in mortar, made of 1 part (Rosendale) cement and (2) parts clean, sharp sand, and all joints and chinks filled solid with mortar and spalls. All inside joints to be smoothly pointed with the trowel as the wall is built. After the wall is built the joints on the outside are to be raked out and filled with cement mortar, and a false joint of red Portland cement mortar run with a jointer and straight-edge, in imitation of broken ashlar.

* This is unnecessary in ordinary foundations for dwellings.

+ Only required in places where a neat and extra strong wall is required. This is expensive work.

X Or, in courses varying from 8 to 12 inches in height, every other course to be the full size of the pier and the intermediate course to consist of two stones, each one-half the size of the pier. Each stone to be laid on its natural bed. etc.

Field Rubble. - The external wall of (first story) is to be faced with round field stones, selected for their color, and the moss and lichens left on. The stones to be fitted together according to their size and without spalls. The back and sides to be split with the hammer where necessary to give a bond, and the stones to have their long axis crossways of the wall and to be laid in cement mortar. The wall to be backed up with split-face rubble carefully bonded to the facing.