Offering new information on floor crack isolation membranes, the Ceramic Tile Institute of America (CTIOA) has posted a report on the subject at its website, www.ctioa.org. Titled "Ceramic Tile Installation on Floor Crack Isolation Membranes," the three-page report finds that crack membrane protection is "limited to minor horizontal planar movement of the substrate and will not provide protection against vertical movement." The CTIOA says it is important that the correct installation methods are identified and recommended for these types of installations.