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In Maryland and Virginia, the required air tightness for new single-family homes is an air leakage rate that must not exceed 3.0 air changes per hour (ACH) at a pressure difference of 50 Pascals. Homes scoring below 3.0 ACH have a tighter building envelope than the code requires. Our homes consistently score between 1.0 and 1.5 ACH! #netzero #LEEDcertified #customhomebuilder #DMVhomes

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