Exam (elaborations)
RADON EXAM QUESTIONS AND ANSWERS
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RADON EXAM QUESTIONS AND ANSWERS
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RADON EXAM QUESTIONS AND ANSWERSEPA recommends mitigation of radon at what level - Answers -Greater than or equal to
4 pci/l
EPA Home Buyer and Sellers Guide specifically deals with - Answers -home purchases
and sales, and the potential for radon device interference
EPA recommends testing radon in - Answers -the lowest level that could be used
regularly
What percentage of homes in the US have elevated radon levels - Answers -1 in 15
According to EPA - If you decide to finish or renovate an unfinished area of the home in
the future, a radon test should be done - Answers -before starting the project and after
the project is finished.
According to EPA, what are 5 radon resistant features - Answers -1. Gas-permeable
Layer
2. Plastic Sheeting
3. Sealing and Caulking
4. Vent Pipe
5. Junction Boxes
Gas-Permeable Layer - Answers -This layer is placed beneath the slab or flooring
system to allow the soil gas to move freely underneath the house. In many cases, the
material used is a 4-inch layer of clean gravel. This gas-permeable layer is used only in
homes with basement and slab-on-grade foundations; it is not used in homes with
crawlspace foundations.
Plastic Sheeting - Answers -Plastic sheeting is placed on top of the gas-permeable layer
and under the slab to help prevent the soil gas from entering the home. In crawl spaces,
the sheeting (with seams sealed) is placed directly over the crawlspace floor.
EPA booklet Consumers Guide to Radon reduction deals with what? - Answers -This
booklet is for people who tested their home for radon and have elevated radon levels —
4 pCi/L or higher.
What is the number one source of radon in homes? - Answers -Radon gas in soil
Congress has set a long time goal that indoor radon levels be no more than - Answers -
outside radon levels, 0.4pci/l
With todays technologys radon can be reduced in homes to - Answers -2 pci/l or below
, Soil suction - Answers -prevents radon from entering your home by drawing the radon
from below the home and venting it through a pipe, or pipes, to the air above the home
where it is quickly diluted.
diagnostic tests - Answers -the contractor may need to perform diagnostic tests during
the initial phase of the installation to help develop the best radon reduction system for
your home. For instance smoke tests and soil communication test
soil communication test - Answers -This test uses a vacuum cleaner and chemical
smoke to determine how easily air can move from one point to another under the
foundation.
In homes that have a basement or a slab-on-grade foundation, radon is usually reduced
by one of four types of soil suction - Answers -sub-slab suction, drain-tile suction, sump-
hole suction, or block-wall suction.
Active subslab suction — also called subslab depressurization - Answers -Most
common and most reliable. One or more suction pipes are inserted through the floor
slab into the crushed rock or soil underneath.e. A radon vent fan connected to the
suction pipes draws the radon gas from below the home and releases it into the outdoor
air while simultaneously creating a negative pressure or vacuum beneath the slab.
Passive subslab suction - Answers -is the same as active subslab suction except it
relies on natural pressure differentials and air currents instead of a fan to draw radon
up. Not as effective as active subslab suction.
Block-wall suction - Answers -can be used in basement homes with hollow block
foundation walls. This method removes radon and depressurizes the block wall, similar
to subslab suction
submembrane suction - Answers -Used in homes with crawlspaces/ most effective way
to reduce radon in homes with crawlspaces. A vent pipe and fan are used to draw the
radon from under a high density plastic sheet.
active crawlspace depressurization - Answers -Crawlspace home option, draws air
directly from the crawlspace using a fan
Passive ventilation - Answers -In a crawlspace, opening vents or installing additional
vents
Active ventilation - Answers -uses a fan to blow air through the crawlspace instead of
relying on natural air circulation
The exhaust pipes of soil suction systems must vent above the surface of the roof and -
Answers -10 feet or more above the ground, and must be at least 10 feet away from
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