… For home construction, some are exploring the emerging technology of 3-D printing. A machine layers special mortar to form concrete walls and cuts the building time by several days compared to traditional brick and mortar work. A company, 14Trees, has used the technology to build a showcase house in Nairobi and 10 houses in coastal Kilifi County. Company CEO Francois Perrot said the technology can help address the huge housing need on the African continent, but it will take time. "If we want to clear that backlog, we need to build differently, we need to build at scale, with speed, an