It's also often found in insulating board materials installed under or around heating appliances. It's extremely fragile and is easily disturbed. Vinyl Flooring Sheet vinyl and tiles may contain asbestos if manufactured prior to the mid-1980s. Sheet vinyl can be dangerous to remove because it may be backed with felt containing high concentrations of asbestos. Fibers may be readily released into the air if this backing is disturbed dry.
Tiles are generally safer because asbestos fibers are bound up inside the tiles in a petroleum base.
Siding Cement asbestos-board siding is a very dense, brittle product used primarily in the 1940s, 1950s and into the 1960s. You've confirmed that it is asbestos. You have good options. Remember, asbestos is a problem only if fibers are released to the air. Asbestos-containing materials that are in good repair and not being disturbed will not release asbestos fibers.