780 CMR, ch. 51, app AF, AF101.1

Current through Register 1538, January 3, 2025

Section AF101.1 - General

Revise and replace section AF101.1 General as follows:

This appendix contains minimum requirements for new construction in the high radon potential counties as listed in Table AF101(1) regardless of the radon levels at the site. These requirements are intended to provide a passive means of resisting radon gas entry and prepare the dwelling for post-construction radon mitigation, if necessary. See Figure AF102. Active construction techniques, rather than passive techniques, shall be permitted to be used where approved.

Alternatively, the passive system requirements of ANSI/AARST Standard Designation #CCAH: Reducing Radon in New Construction of One & Two Family Dwellings and Townhouses, 2013 may be used for new construction in Zone 1, or approved equal system.

Irrespective of which approach is used, no testing is required as follows:

1. for the radon levels at the site prior to construction;

2. for the radon control system when completed; or

3. in the building after completion of the project.

Therefore, such testing shall not be a condition of issuing a certificate of occupancy.

780 CMR, ch. 51, app AF, AF101.1

Amended by Mass Register Issue 1532, eff. 10/11/2024.