A typical carpet roll is about 12 feet long. However, rooms come in all sizes. When a room is larger than 12 feet several pieces of carpeting have to be joined together, and that process can present as a problem in a DYI project. Nothing looks more unprofessional than a clear seam in the middle of the room.
Professional carpet layers use a heat activated glue strip placed under the seams of the joining segments. This strip is activated using a special heating plate in a slow and arduous process. A heavy weight is then placed on the heated segment to make sure that the two pieces are completely bonded. Lastly, the installer will use a carpet seam roller to make sure that the pile of the two carpets are also in proper alignment.
This sealing process takes a lot of time, but assures the homeowner of a beautiful and seamless wall-to-wall effect.