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To: City of Orono Page 1 of 4 2018-04-05 21:24:05(GMT) 15072999410 From: KRISTIN LOEFFLER <br /> •4 <br /> FAX COVER SHEET <br /> TO City of Orono <br /> COMPANY City of Orono <br /> FAXNUMBER 19522494616 <br /> FROM KRISTIN LOEFFLER <br /> DATE 2018-04-05 21:23:44 GMT <br /> RE PermitApplicationfor4051 HighwoodRd. <br /> COVER MESSAGE <br /> Complete Basement Systems <br /> Con p;j r, re for bode <br /> �'$ance City of Orono <br /> Dai <br /> Reviewer <br /> R408.3Unvented crawl space. <br /> Ventilation openings in under-floor spaces specified in Sections R408.1 and R408.2 shall not be required <br /> where: <br /> 1.Exposed earth is covered with a continuous Class I vapor retarder.Joints of the vapor retarder shall overlap by 6 inch- <br /> es (152 mm) and shall be sealed or taped. The edges of the vapor retarder shall extend at least 6 inches (152 mm) up <br /> the stem wall and shall be attached and sealed to the stem wall or insulation;and <br /> 2.One of the following is provided for the under-floor space: <br /> 2.1.Continuously operated mechanical exhaust ventilation at a rate equal to 1 cubic foot per minute (0.47 L/s) <br /> for each 50 square feet (4.7m2) of crawlspace floor area, including an air pathway to the common area (such as <br /> a duct or transfer grille), and perimeter walls insulated in accordance with Section N1103.2.1 of this code; <br /> 2.2.Conditioned air supply sized to deliver at a rate equal to 1 cubic foot per minute (0.47 L/s) for each 50 <br /> square feet (4.7 m2) of under-floor area, including a return air path way to the common area (such as a duct or <br /> transfer grille), and perimeter walls insulated in accordance with Section N1102.2 of this code; <br /> 2.3.Plenum in existing structures complWnAv iif4MvGIN601.5, if under-floor space is used as a plenum. <br />