Where caulking is to be done for work which is to be subjected to pressure, it is important that the lap should not be greater than that named above, as the plates may spring in caulking or in use.

To caulk properly, the plate edge should be planed slightly on the bevel, as shown in joint No. 27. A too thin caulking tool should not be used, as this has a tendency to drive the metal under the edge, and thus spring the plate.

In arranging the position of joints on any kind of vessel, care should be taken that they are so placed that the riveting and caulking can be conveniently done.