The main soil, waste and vent pipes should be of wrought iron with screw joints, not only on account of the great weight of the high stacks of pipes, but because the expansion and contraction of the great height of pipe would destroy the lead caulking usual with cast-iron pipes. The pipes must be securely fastened to the solid frame of the building, and all joints well screwed together with ample chance for expansion. Brass supply pipes should be used throughout, nickeled or bronzed to taste when showing. As the pipes will all show, the soil and waste pipes will need to be smooth and well put together so that when bronzed or finished they will not be unsightly.

Fig. 246. Beam Stair Stringer and Finish.

Fig. 246. Beam Stair Stringer and Finish.