Code of Maine Rules › 02 - DEPARTMENT OF PROFESSIONAL AND FINANCIAL REGULATION › 385 - MANUFACTURED HOUSING BOARD › Chapter 110 - STATE CERTIFICATION OF MODULAR HOMES › Subchapter 2 - Codes and Standards › Section 385-110-2-13 - Radon Mitigation Preparation Standard

Current through 2024-29, July 17, 2024
1.
Purpose and Scope
The purpose of this standard is to provide a reasonable
					 code for manufacturer-installed vent piping and electrical supply boxes within
					 the envelope of a state-certified modular home to facilitate future, on site
					 completion of the radon mitigation system should such a system be required
					 either by code or by the consumer. This standard is based on Appendix F: Radon
					 Control Methods of the IRC, a nationally recognized code, that will apply to
					 all state-certified modular homes that are installed in Maine. This standard
					 sets forth design and construction requirements relating to preparation for
					 radon mitigation in state-certified modular homes.
2.
Compliance; Limited Waiver of
				  Compliance
State-certified modular homes must comply with the
					 provisions of this Section. The executive director may waive compliance with
					 the radon standard contained in subsection 4 in the limited circumstances
					 described in subsection 4(I).
3.
Materials and Equipment
Materials and equipment must be identified in a manner that
					 will allow a determination of their compliance with the provisions of this
					 subsection. (2009 IRC, N1101.3) Materials and equipment used to conform to the
					 applicable provisions of this chapter must be installed in accordance with the
					 manufacturer's installation instructions.
4.
Radon Standard
A.
Entry routes
Potential radon entry routes such as openings around
					 bathtubs, showers, water closets, pipes, wires or other objects that penetrate
					 the floor assemblies must be filled with a suitable sealant applied in
					 accordance with the manufacturer's recommendations. (2009 IRC,
					 AF103.4.1)
B.
Vent
				  pipe
The manufacturer must install a 3-inch-minimum diameter
					 vent pipe up through the building floors at least 2 feet into the attic space
					 and capped below the roof. The vent pipe must be installed such that the pipe
					 can be extended by others at a later date and located at least 12 inches above
					 the roof in a location at least 10 feet away from any window or other opening
					 into the conditioned spaces of the building that is less than 2 feet below the
					 exhaust point and 10 feet from any window or other opening in adjoining or
					 adjacent buildings. (2009 IRC, AF103.5.3 and AF103.6.1)
C.
Vent pipe drainage
All components of the 3-inch-minimum diameter vent pipe
					 installed by the manufacturer up through the building floors and capped below
					 the roof must provide for positive drainage. (2009 IRC, AF103.7)
D.
Vent pipe
				  accessibility
Radon vent pipes must be accessible for future fan
					 installation through an attic or other area outside the habitable space. (2009
					 IRC, AF103.8) Any accessible space reserved for the radon fan must occupy an
					 imaginary cylinder, standing on end, which is 24 inches or more in diameter,
					 centered on the axis of the vent pipe, and extending a minimum vertical
					 distance of 3 feet.