Reducing Radon in New Construction of ANSI/AARST CCAH 2020 1 & 2 Family Dwellings and Townhouses 13 plates and not less than 2 inches below top plates and shall extend not less than 2 inches beyond each side of the pipe. 501.9 Insulation required. In interior spaces where rough-in piping is subject to freezing temperatures and in spaces where the external surface of the rough-in piping is subject to the formation of condensation, such piping shall be provided with insulation having an external vapor barrier and an R-value of not less than 1.8. 501.10 Labels required (piping). Radon control system piping shall be marked prior to the closing of wall cavities with not less than two labels at each floor level with placement so as to provide visibility on either side of the wall cavity and at intervals not greater than 10 feet [3 m] along the developed length of the piping. The label shall identify that the item is a component of a radon reduction system. The label lettering shall be of a height of not less than 1/4 inch [6.35 mm] and shall be of a color in contrast to the color of the background on which the lettering is applied. 501.11 Labels required (System Rough-in). Radon control system piping shall be marked with not less than one label in a conspicuous location. An additional label shall be placed on or within 12 inches [30 cm] of the electrical service panel. The labels shall state: “ TEST FOR RADON. The radon system has NOT been activated with a radon fan. Without testing, such system cannot be verified to reduce indoor radon to the levels recommended by the U.S. EPA.” The label lettering shall be of a height of not less than 1/4 inch [6.35 mm] and shall be of a color in contrast to the color of the background on which the lettering is applied. SECTION 601 RADON CONTROL SYSTEM TERMINATION 601.1 Outdoors. The discharge point of radon control system piping shall be to the outdoors and shall be directed vertically upward. Where screens are installed on the terminus of radon exhaust pipes to prevent the entry of animals, such screens shall have a mesh size with a dimension of at least 0.5 inch (12.7mm) 601.2 Elevation and vertical walls. The point of discharge of a radon control system piping shall comply with all of the following: 1) it shall be not less than 1 foot [30 cm] above the roof measured at the highest point of the penetration. 2) it shall be not less than 10 feet [3 m] above grade nearest the point of discharge. 3) it shall be not less than 10 feet [3 m] horizontally from a vertical wall that extends above the roof penetrated. 601.3 Windows and doors. The discharge point of radon control system piping shall be not less than 10 feet [3 m] measured in any direction from, or not less than 2 feet vertically above, air intake openings including windows, doors and other gravity air intake openings and excluding attic ventilation openings. The specified clearances apply to the structure served by the radon control system and any adjacent structures. 601.4 Equipment air intake. The discharge point of radon control system piping shall be not less than 3 feet [91 cm] above or 10 feet [3 m] away frommechanical air intake openings such as those for evaporative coolers, make-up air, and heat/energy recovery ventilators. The 10 foot [3 m] distance shall be measured around intervening obstacles.