The Golden State: Where & How to Live, Secure, Visit, Enjoy and Thrive in California
How To Design And Install Plumbing
The base fitting, Fig. 88, consists of an extra heavy cast-iron Vi bend which is calked into a half length of extra heavy cast-iron pipe of 4-inch diameter. The hub end of the 14 bend must be extended to a point at least 12 inches above the finished grade to serve as a connection for the outside roof leader.
The base fitting is made up away from the job. When construction has progressed sufficiently, its exact location must be determined from the building plan. Care should be used to plumb the vertical portion of the fitting so its appearance will be in keeping with the remainder of the building.
Inside Roof Leader. The inside roof leader may be constructed of galvanized steel or wrought-iron pipe, cast-iron soil pipe, brass, or copper. Fittings of the common variety or recessed drainage type may be used.
The leader generally is started vertically from its connection with the house drain, which is a fitting of long radius. Some means for testing the conductor must be provided at its base. A test tee is the best device for this purpose. When the final test has been completed, the test tee serves the storm drain as a cleanout.
The roof leader is extended vertically through the floors of the building to a point just below the roof, and is then extended horizontally to reduce the danger of breakage which may result because of expansion and contraction of the roof.
The change of direction at the highest point of the conductor should be made by means of an elbow and 45-degree fitting, as shown in Fig. 89. Fittings installed in this manner form a swing joint and take up any movement of the roof.
Changes in direction of the roof leader must always be of long radius so the flow of water in the conductor will not be retarded, except where the change is from horizontal to vertical direction. Branches from the installation may be made with 45-degree Y's and 1/8 bends or 90-degree short pattern tees. The former are recommended.
If the roof leader is constructed of galvanized steel it must be supported at every floor with a pipe rest, Fig. 89. Horizontal runs may be suspended from band iron hangers or steel ring hangers anchored in the structure. The base of the roof leader must be provided with a concrete or stone foundation.
Roof Terminals. There are many types of manufactured roof terminals for rain water leaders. All are constructed on the same principle, the only difference, as a rule, being the size and design of the castings.
