In construct, a splice plate is a thick metal sheet used used to reinforce the connection between structural steel beams. The joint between two pieces of steel is known as a splice, and each splice must be carefully reinforced to ensure a secure bond. Despite the high strength of steel beams and columns, a weak splice between two beams can compromise the structural integrity of an entire building. Adding a splice plate minimizes the risk of failure and helps improve safety for building occupants.

After two beams are positioned as needed, the splice plate is centered along the spliced area. It may be placed on the web, or the beam, or on the chords, depending on installer access and engineer recommendations. Sometimes a single splice plate is used to secure the two beams, while other applications require two splice plates for a more secure hold.

Steel erectors utilize splicing for a number of reasons. In some cases, there are simply no beams available that are long enough for a particular application. In others, a full-length beam may be too difficult to transport to the job site, or even to get in or out of the building. Finally, beam splices can help workers erect steel around obstructions, or maneuver them through the building without damaging surrounding surfaces.