A standard fifty-pound bag of self-leveling underlayment typically covers approximately twenty to twenty-five square feet when poured at a uniform thickness of one-quarter of an inch. However, this coverage estimate changes dramatically based on the depth of the pour required to level out the specific subfloor. If a deep dip requires a half-inch thick application, the coverage area provided by a single bag is cut in half, yielding only ten to twelve square feet of coverage. Installers must carefully measure total square footage and calculate average depth requirements before purchasing materials to ensure they do not run short mid-pour.
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