Explanation Why Every Home Ought To Have Sub Floor Air Flow It is recommended when putting in drywall to leave a 1/4″ gap between the concrete floor and the base of the drywall to keep away from moisture contamination. Install 1/four″ spacers between the drywall and the DRICORE® Subfloor http://milooplfz.fireblogz.com/26327847/guru-recommendation-on-major-elements-for-sub-floor-ventilation-fan