On Jun 27, 7:50*pm, bob haller wrote:
On Jun 27, 5:38*pm, Bryce wrote:





gregz wrote:
Bryce wrote:
Thanks for your comments.

We are the sellers and in a neighborhood in decline, so
we are anxious to complete the sale: tough to find buyer
and we already have a new house awaiting.

Radon test was done in the middle of the house with A/C
running. Downdraft furnace (in interior room near one end
of house) feeds conditioned air through metal ducts under
the slab, which is about 2' above grade, no crawl space.
No vents through the foundation walls. Return air to
furnace via ducts in attic. House was built in 1960.

Remediation contractor (not affiliated with inspector to
our knowledge) proposes to install suction system next to
furnace and test afterward. Cost ~$1000, "30 year
guarantee"

I have a hunch that the suction will be overpowered by
leaks in the heating ducts. For sure, we will run A/C
during test, pay by credit card.

You never answered my question. If water ever comes up to
slab, you also need a sump pump, and that makes it tricky.

Greg

Sorry!

Slab is about 2' above grade. If water gets that high, we
have a lot of problems! We've never had water problems in 17
years and this summer is the dryest in memory.

I have often wondered if you owned a high radon home that sat at least
a couple feet above street level.....

You could combine a interior french drain , with a outlet at street
level to daylight and perhaps a fresh air intake at the far end of the
french drain, making not only a passive radon gas exhaust but also a
passive interior french drain? radon gas is heavier than air, and
gravity tends to be highlly reliable for water. no sump pump or power
needed. I came up with this idea years ago when a big storm knocked
out power, and sump systems overflowed....

i started some of this years ago but divorce and life got in the way- Hide quoted text -

- Show quoted text -

I put a 4-inch duct booster fan in a 4-inch dryer vent pipe and
connected that from the top of my sump pump cover to an outside wall
just above the concrete foundation. It basically gives a slight
negative pressure to the drains around and under the house and any
radon that comes up thru the ground is exhausted to the outdoors in a
location where no one ever goes so I don't worry about the low
physical level of the output pipe.