Can this be used on a dirt floor that has concrete footing? A Can this be used on a dirt floor that has concrete footing? Ideally, the subfloor should be a hard, flat surface for best vinyl flooring installation and long term results. Share facebook twitter linkedin pinterest email Back to Top What floor preparation is needed other than cleaning? Are there tools or any other materials, i.e. adhesive, trimming, seaming or other sundries needed to join mats or finish edges? Can G-Floor roll out flooring be used outdoors?