What is the technique for putting lead into floor joints ?
Molten lead is not recommended because it is somewhat dangerous to use, especially if the concrete is at all damp. Lead is usually inserted into the joint in the form of strips and beaten over at the top edge. It is currently more common to fill the joint with an epoxy or other hard material which will give support to wheel loads as they cross the joint. If a hard, nonextensible epoxy is used, care should be taken to see that bond is prevented on one side.