The fireplaces are to be built complete with fire-brick backs and facings, all laid flat, as the chimney is constructed. Special shaped firebrick. with ends moulded so as to conform to the line of the facing and bevel of the jambs, are to be used at the angles between facing and jambs.
All brick below the flat arch arc to be laid in fire clay with close joints; and in each joint a strip of No. 24 expanded metal is to be built, extending within •'_, inch of the face of the brick and leaving at least 4 inches to build into the mortar joint of backing. In the throat, put cast-iron flue-stops, with dampers which can easily be closed from below.
The flat arches above are to be laid in Portland cement mortar, with No. 24 expanded metal extending through each joint to within inch of exposed faces and sticking up 4 inches. When this is complete, a reinforced concrete beam is to be formed above, in which the brick ties are to be embedded in addition to 6 strands of No. 8 twisted wire fencing.
The flue linings of hard terra-cotta are to be set close; and any which are crooked or broken in handling will be rejected.
Face Brick. Face brick will be used for the visible surfaces of the exterior brick walls and chimneys. Each course will alternate headers and stretchers, and the facing and backing are to be carried up together and of such size brick that the headers of every fifth course will bond. The header of all other courses may be half brick. The joints will be approximately '- inch thick, and trowel pointed as the work is laid; and all mortar must be kept off the face.
Over the windows, flat arches are to be formed, bonded, as re quired for the fireplaces, to the concrete beam formed back of the arch.
Setting of Granite and Soft Stone. The joints are to be a inch thick, with expanded metal as required above therein, the mortar to be of the sarne composition as for brick.
The contractor will be responsible for any staining of the faces of the stone. I4e will be permitted to use such brand of cement as he may consider safe, provided in the tests it conforms to the require ments of Portland cement as stated under "Cement." Setting Terra=cotta—Structural. All furring terra-cotta is to be set in Portland cement mortar. As 1 to 4 mixture would be too short for the thin edges, the mortar will be 1 cement to 22 sand; and one 30d-spike is to be driven into the brick mortar joints, with head projecting 11 inches into furring joint for tie.
Ornamental Terra=cotta. All joints are to be inch thick; and the special anchors shown on the detail are to be built in. Fill all hollow portions with concrete formed by filling in with cement mortar and then crowding in broken bricks until the mortar is forced into every corner.
Over all approximately horizontal surfaces, put a 1-inch coat of Portland cement mortar, 1 part cement to 1 part sand, after cover ing the surface with a continuous sheet of No. 24 expanded metal. The terra-cotta surface is to be thoroughly wet, the mortar coat pressed vigorously through the metal, and the surface finished smooth. This surface it to be protected from the sun for four days, and wet at such intervals as will keep it at all times moist.