Bgsg

Extremely case-specific

Sealing all noticeable interior cracks, cold joints, openings around services, and pores in basement walls and floors with appropriate materials

Installation costs range between $300 and 500.

Drain-tile soil ventilation

Continuously collects dilutes and exhausts soil-gas-borne radon from the footing perimeter of houses

PCBa

Up to S8

Moderateg

Continuous collection of soil-gas-borne radon using a 160-cm fan to exhaust a perimeter drain tile

Applicable to houses with a complete perimeter, footing level, drain tile system and with no interior block walls resting on subslab footings

Installation cost is $1200 by contractor.

Operating costs are $15 for fan energy and up to $125 for supplemental heating.

Active ventilation of hollow-block basement walls

Continuously collects, dilutes, and exhausts soil-gas-borne radon from hollow-block basement walls

Moderate to high

Continuous collection of soil-gas-borne radon using one 250-cm fan to exhaust all hollow-

block perimeter basement walls

Baseboard wall collection and exhaust system used in houses with French (channel) drains

Installation costs for a single, suction-and-exhaust-point system is $2500 (contractor-installed in unfinshed basement).

Installation cost for a baseboard wall collection system is $5000 (contractor-installed in unfinished basement).

Operating costs are $15 for fan energy and up to $125 for supplemental heating.

Subslab soil ventilation

Continuously collects and exhausts soil-gas-borne radon from the aggregate or soil under the concrete slab

PCBa

G-SG, as high as SS in some cases

Moderate to high

Continuous collection of soil-gas-borne radon using one fan (~100 cfm, >0.4 in H2O suction) to exhaust aggregate or soil under slab

For individual suction point approach, roughly one suction point per 500 sq ft of slab area

Alternate approach of piping network under slab, permitting adequate ventilation without a power-driven fan

Installation cost for individual suction point approach is about $2000 (contractor installed).

Installation costs for retrofit subslab piping network are over $5000 (contractor installed).

Operating costs are $15 for fan energy (if used) and up to $125 for supplemental heating.

Source: U.S. Environmental Protection Agency (EPA), 1986, Reduction for detached houses, EPA 625/5-86/019 (Research Triangle Park, N.C.: U.S. EPA). Note: aBB (block basement) houses with hollow-block (concrete block or cinder block) basement or partial basement, finished or unfinished PCB (poured concrete basement) houses with full or partial, finished or unfinished poured-concrete walls C (crawl space) houses built on a crawl space S (slab or slab-on-grade) houses built on concrete slabs

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