MAH_2019

MAH 2019 Companion Guidance Section A General Inspection of Mitigation Systems 3 GENERAL INSPECTION — EXISTING RADON MITIGATION SYSTEMS FUNCTIONAL INTEGRITY OF COMPONENTS Advisory—This list is intended for use by homeowners and inspection personnel. It is not intended to verify compliance with local regulations or any published radon standard. TYPE OF MITIGATION SYSTEM(S) INSTALLED ( ) Sub-slab Depressurization ( ) Sub-membrane Depressurization ( ) Soil Vent Piping Without Fan ( ) Sump Depressurization ( ) Block Wall Depressurization ( ) Other Method ( ) Drain Tile Depressurization ( ) Depressurization of Non-habitable Airspace Radon System Piping If No, recommended action ❏ Is piping watertight or free of visible water leaks? ❏ Take action to seal pipe joints ❏ Is piping sloped to drain water in the pipe to the soil? ❏ Take action to achieve drainage ❏ Is piping secured to the building in durable manner? ❏ Take action to correct piping deficiencies ❏ Is the exhaust air discharging freely without obstructions? ❏ Are building materials safe from exhaust vapor damage? ❏ Is the piping durable and in good repair? Fans ❏ Is there a switch, plug or labeled breaker to turn off the fan? ❏ Take action to correct the fan installation ❏ Do flexible couplings connect the fan to piping? ❏ Is the fan rated for safety and constant activation needed for radon systems and capable of draining water? Sump Lids ❏ Are sump lids fastened and sealed in a manner that allows removal for service where closure is achieved with non- permanent materials such as silicone caulk or gaskets? ❏ Add features required in national standards that allow reasonable access to conditions inside the pit ❏ For suction piping found attached to a sump lid, does the pipe have a flexible coupling disconnect to ease access to the pit? Sub-membrane Depressurization ❏ Are air intakes under the membrane free of obstructions? ❏ Take action to correct the deficiency ❏ Is the top of the membrane free of standing water? ❏ Are all sizable membrane openings to soil closed? ❏ Are the edges of the soil gas retarder closed or sealed? ❏ Improvements may be warranted to enhance system effectiveness and long-term integrity of the membrane ❏ Is durability of the membrane material adequate? ❏ Is the soil gas retarder is not secured to walls for crawl space areas that are accessible for routine storage or other activity? Less Common Radon Mitigation Methods ❏ Does the mitigation method solely consist of system piping, radon fan(s) and closure between soil gas and indoor air? ❏ Consult with a radon professional for evaluating Non-ASD systems