Extrusion machinery sales held their own in 2019, despite challenges of slowing economic growth, tariff wars and global uncertainty, machinery executives said. The blown and cast film machinery sector could be a victim of its own success, as several strong sales years could leave an overhang for 2020, some company officials said. In construction — a big market for extruders — vinyl is the top-selling choice for siding and windows for new single-family homes as well as remodeling. The newer category of luxury vinyl tile and luxury vinyl plank, which looks like wood flooring, has given new life to the vinyl flooring market. The National Association of Home Builders said total housing starts continued to make steady gains in October, increasing 3.8 percent to a seasonally adjusted annual rate of 1.31 million units. The sector of single-family starts increased 2 percent, to a pace of 936,000 for the year. The important rate of single-family starts has grown since May, said NAHB Chief Economist Robert Dietz. “Solid wage growth, healthy employment gains and an increase in household formations are also contributing to the steady rise in home production,” Dietz said. Remode...