Underlay For Wood Flooring, Which Floors Need It & Why? - Factory ..Unlike most of the other flooring types, vinyl doesn't require underlay and can be installed directly onto the subfloor using either glue, double-sided tape or even . solid-wood-floor. Last but not least, solid wood is a tricky one. While it is noticeably thicker than laminate, usually ranging between 12mm-18mm, it doesn't have.