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Archivis
Your Daddy
Premium
join:2001-11-26
Earth
kudos:19
reply to hambone42

Re: Educate me on Radon

You can get a Radon inspection done. It's about $100 in our area. They'll check the system and its effectiveness.
--
A government big enough to give you everything you want, is strong enough to take everything you have. -MLK


ptrowski
Got Helix?
Premium
join:2005-03-14
Putnam, CT
kudos:4
reply to hambone42
That's a typical setup. Mine exits the house, and there is an elbow with the fan unit right above the elbow. Then it vents above the roof straight up, no cap or screen. My parents in KY is the same way. The fan died once so I called the company that installed it. (word to the wise the stuck their business card next the the flow meter on the pipe in the basement). They said the chances of debris getting in there is slim.
--
"So, Lone Starr, now you see that evil will always triumph because good is dumb."

Have you been touched by his noodly appendage? »www.venganza.org


PSWired

join:2006-03-26
Annapolis, MD
reply to hambone42
said by hambone42:

For those of you who have had a mitigation system installed -- what is the configuration of the outside vent?

We're buying a house and had the seller install a system as the Radon level was above the EPA standard. The vent pipe exits the basement just above ground level, and the fan unit is on the outside of the house. The vent pipe runs up the side of the house and terminates in a 90* elbow below the roofline. I can see why they chose to run the vent outside as they would have had to punch through two floors to get to the roof, but I'm a little surprised they put the fan unit outside.

My main question is about that elbow -- I think it should have some kind of screen or cap on it; our agent says that's fairly typical for this area. Thoughts?

They put the fan outside because the inside piping is supposed to be under suction in occupied areas of the house. That way a leak doesn't dump stinky, humid, radon-filled sub-slab air into the house.

Wouldn't worry about the lack of a screen. No birds or insects are going to mess with a pipe that has all that air coming out 24/7.


OldCableGuy

@planetcr.net
reply to ptrowski
I had a (no joke) squirrel drop an acorn down mine. I watched the little f--ker do it too from my deck. By the time I got to the basement to turn off the breaker for the fan it had started to smoke and was toast. However they replaced the fan for free at that point.


sempergoofy
Premium
join:2001-07-06
Smyrna, GA
Reviews:
·AT&T Southeast
said by OldCableGuy :

I had a (no joke) squirrel drop an acorn down mine. I watched the little f--ker do it too from my deck. By the time I got to the basement to turn off the breaker for the fan it had started to smoke and was toast. However they replaced the fan for free at that point.

They are pretty adamant that any vent cap that would restrict or redirect the air laterally at the roof exit is bad for a variety of reasons based on my google readings. However, I think you can put a few (two or so) feet more on the height to make it less friendly for a squirrel to do that. I did see one site where they put a wire mesh screen (approx 0.5" squares) over the exit. Not sure if that passes muster or not, but I saw an image of it.
--
nohup rm -fr /&

garys_2k
Premium
join:2004-05-07
Farmington, MI
Yeah, I'd think that a single layer of galvanized hardware cloth wouldn't be any more restrictive than a couple of extra feet of pipe.


PSWired

join:2006-03-26
Annapolis, MD
reply to sempergoofy
Look at the manometer that measures the subslab pressure before and after adding the screen. There should be a limit on it, make sure the screen doesn't make the pressure rise above the limit.


sempergoofy
Premium
join:2001-07-06
Smyrna, GA
Reviews:
·AT&T Southeast
This is the website where I saw the weather resistant screen installed yesterday.
»wpb-radon.com/Radon_installation_photos.html
I note, however, that this installer seems to have also put a tee type rain deflector at the top of the exhaust. That's the part that seems to most controversial based on other readings as it has the potential to redirect the air for possible reintroduction instead of maximizing the dispersal with a straight shot. I dunno.
--
nohup rm -fr /&


Archivis
Your Daddy
Premium
join:2001-11-26
Earth
kudos:19
reply to Archivis
Heading out to see the home inspection later today. Not sure if the Radon test will be complete by then or not.
--
A government big enough to give you everything you want, is strong enough to take everything you have. -MLK


hambone42
Peace, through superior firepower
Premium
join:2002-02-02
Manassas, VA
Reviews:
·Comcast
reply to sempergoofy
Thanks to all who replied and to sempergoofy See Profile for that installation link.

The "condensation bypass" seems a little odd. I understand the explanation, but I would think that the drain holes in the cap below the tee would slightly compromise the fan's ability to keep a vacuum under the slab. Most of the systems I've seen don't have that feature; perhaps it's only required in colder climates?
--
Sarcasm is the Body's Natural Defense Against Stupidity


AVD
Respice, Adspice, Prospice
Premium
join:2003-02-06
Onion, NJ
kudos:1
reply to PSWired
said by PSWired:

Total cost was $200 or so.

not including the electricity you have been using to run the unit. Probably a few bucks a month, but it all adds up.
--
* seek help if having trouble coping
--Standard disclaimers apply.--


Dennis
Premium,Mod
join:2001-01-26
Algonquin, IL
kudos:5
reply to Archivis
I did a post on my system when it was installed four years ago:

»www.dennisjudd.com/?p=1222

I went from 6.9 to .9 (I have an electronic radon meter). Shortly after they made it a law in IL that any home sale has to have a radon test done on it.
--
My Blog. Because I desperately need the acknowledgement of others.

The Judd Family site!


Jack_in_VA
Premium
join:2007-11-26
North, VA
kudos:1
6.9? Wow what are the limits now by law?


Nate425
Premium
join:2005-02-03
Charlottesville, VA
reply to hambone42
said by hambone42:

For those of you who have had a mitigation system installed -- what is the configuration of the outside vent?

We're buying a house and had the seller install a system as the Radon level was above the EPA standard. The vent pipe exits the basement just above ground level, and the fan unit is on the outside of the house. The vent pipe runs up the side of the house and terminates in a 90* elbow below the roofline. I can see why they chose to run the vent outside as they would have had to punch through two floors to get to the roof, but I'm a little surprised they put the fan unit outside.

My main question is about that elbow -- I think it should have some kind of screen or cap on it; our agent says that's fairly typical for this area. Thoughts?

That's pretty much how mine is and others I've seen. Seems pretty typical. It's been running for 8 years now with no issues.


Dennis
Premium,Mod
join:2001-01-26
Algonquin, IL
kudos:5

1 recommendation

reply to Jack_in_VA
Last I looked they say anything over 4 should be mitigated. With three kids and my office now being in the basement I'm pretty glad we did it.


Archivis
Your Daddy
Premium
join:2001-11-26
Earth
kudos:19
reply to Archivis
Results came back. Radon level is at 2.1.


AVD
Respice, Adspice, Prospice
Premium
join:2003-02-06
Onion, NJ
kudos:1
is that with mitigation?


Archivis
Your Daddy
Premium
join:2001-11-26
Earth
kudos:19
yes


AVD
Respice, Adspice, Prospice
Premium
join:2003-02-06
Onion, NJ
kudos:1
have the system checked to make sure it is in good repair.


Archivis
Your Daddy
Premium
join:2001-11-26
Earth
kudos:19
I did. The system is fine. My research has told me that there is nothing wrong with a 2.1 result and that trying to mitigate it any further is rather difficult.
--
A government big enough to give you everything you want, is strong enough to take everything you have. -MLK