Tile Products Tile Project Calculator Where To Buy Tile     Tile Project Calculator     QUICK PERMAFLEX - SERIES 570 (25# Bag) Square Feet of Job: TROWEL SIZE 1/4" x 1/4" x 1/4" square notch Bags Required: 1/4" x 1/4" x 3/8" square notch Bags Required: YIELD (Square Feet Per Bag): 1/4" x 1/4" x 1/4" square notch: 1/4" x 1/4" x 3/8" square notch