Cost Effective

Sealing sumps and floor drains is a cost-effective method of radon reduction

  • Independent research shows sealing sumps and floor drains can reduce radon levels by 46%
  • In many cases, reducing radon this much is enough to reduce levels to government guidelines.
  • You can achieve effective radon reduction for less than $100 compared to an ASD system costing $1500 to $2500.

Below are excerpts from two studies that measured radon reduction from sealing the basement floor drain in houses with catch-basin style drains. 
The first excerpt is from a study that tested the efficacy of the Dranjertm J-N6 floor drain.  It was a 30-day test before and after installation of the Dranjer.  Table (4) is from that report.

Table 4. Dranjer floor drain seal test data for homes without crawl spaces

Identifier
30-d result Bq/m3
Post Installation Bq/m3
RPD
W4
895
500
44%
W11
204
122
40%
W13
285
126
56%
W27
152
100
34%
W29
237
122
48%
W33
335
144
59%
W40
170
100
41%
Arithmetic Mean
328
173
46%
The value of the RPD in this table is a measure of the Dranjer floor drain seal radon reduction factor

Warkentin P.M., Johnson  Harry M, 2015. Winnipeg Radon Testing: Comparison of Test Durations, Effects of House Characteristics, and Efficacy of Flor Drain Seals. Journal of Health Physics, April 2015, Volume 108, number 4

The second excerpt is from a study that measured radon concentrations in the floor drain and tested radon reductions in the basement from simply sealing the floor drain. 

      The results of measurements of the radon concentration in the floor drain and in the basement air presented in table IV for a group of 7 houses. The radon gas measurements were taken using the Terradex Trach-Etch detectors.
As May be seen from the table, the radon concentrations in the floor drains were very high, ranging from 52.1 to 413.3 pCi/L, with an average 179 pCi/L. In each of the houses tested, the weeping tile was connected directly to the floor drain. Consequently the radon can migrate freely from the soil through the weeping tile and into it. If the floor drain is capped to prevent air flow from the drain into the basement, a substantial reduction in radon concentrations in the basement air would be expected. To determine if this reduction would in fact occur, tests were performed on 10 houses. The results of this remedial measure are presented in Table V.

      As may be seen from Table V. in 8 of the 10 houses, the radon concentration dropped. There was on average a reduction of 46% in the radon concentrations in the basement air after the floor drains had been sealed.

Dumont RS.  The Effect of Mechanical Ventilation on Rn, NO2, CH2O Concentrations in low-Leakage Houses and a Simple Remediation Measure for Reducing Rn Concentration.  Transactions, Indoor Air Quality in Cold Climates: Hazards and
Abatement Measures.  In APCA Specialty Conference, Ottawa April 1985.  IRC Paper 1383, NRCC 25994. P. 95



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