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1. Fill the
seams and depressions with a Portland cement–based floor leveler. Feather
the filler perfectly smooth with the underlayment. Once it’s dry, scrape
any ridges and sand away any high spots with a pole sander (Photo 9) fitted
with 100-grit sandpaper. Check also for high screws as you drag your blade
across the floor. If you hear a click, set the screw lower. Remember,
irregularities or high fasteners will “telegraph” up through the
cork.