Radon Control in New Construction

Like most other indoor air contaminants, radon can be controlled by keeping it out of the house, or reducing the concentration by mixing it with fresh air after it has already entered. The following approaches have been tried or suggested9:

1. Prevent entry

• Make provisions for an SSD or pressurization system during construction.

• Install mechanical barriers to block soil gas entry.

2. Planned mechanical systems

• Supply fresh air to reduce radon by dilution.

• Control pressure relationships to reduce soil gas entry.

Figure 31.6 illustrates the following four major topics to be considered in this chapter:

1. Site evaluation

2. Mechanical barriers

Open tops of hollow core masonry blocks

Diffuses through interior of wall

Dampproofing or waterproofing

Loose form ties Floor drains Cracks in floor

Open pipe penetrations and joints

FIGURE 31.3 Typical radon entry routes in basement foundations. (Adapted from U.S. EPA, Radon-Resistant Construction Techniques for New Residential Construction—Technical Guidance, EPA/625/2-91/032, U.S. Environmental Protection Agency, Washington, DC, February 1991.)

FIGURE 31.4 Typical crawlspace foundation entry route. (Adapted from U.S. EPA, Radon-Resistant Construction Techniques for New Residential Construction—Technical Guidance, EPA/625/2-91/032, U.S. Environmental Protection Agency, Washington, DC, February 1991.)

joints

FIGURE 31.5 Typical radon entry routes in slab-on-grade construction. (Adapted from U.S. EPA, Radon-Resistant Construction Techniques for New Residential Construction—Technical Guidance, EPA/625/ 2-91/032, U.S. Environmental Protection Agency, Washington, DC, February 1991.)

joints

FIGURE 31.5 Typical radon entry routes in slab-on-grade construction. (Adapted from U.S. EPA, Radon-Resistant Construction Techniques for New Residential Construction—Technical Guidance, EPA/625/ 2-91/032, U.S. Environmental Protection Agency, Washington, DC, February 1991.)

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