Unfinished Domestic Hardwood Flooring QSRO2S - Quartersawn 3/4 x 2-1/4 Red Oak Unfinished SelectQuarter sawnTo make quarter sawn flooring- the log is first cut in quarters and then sawn perpendicular to the growth rings. This cut produces a floor with a tight vertical grain which looks good and is very stable. When quarter sawn flooring is introduced to changing humidity- wood expands and contracts vertically instead of horizontally. This characteristic makes quarter sawn flooring an ideal choice for installations over radiant heat.