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10 votes
Accepted

Radon suction vs pressurization

The problem with this idea is that you don't really control where the radon-containing air will vent. You may actually end up pushing it into your living space. With the suction setup that is used, ...
jwh20's user avatar
  • 23.4k
9 votes
Accepted

Is there a way to color Radon to see where it enters and moves?

Radon mitigation best practices are well defined - radon is heavy and tends to accumulate at the lowest point of the house where there is no ventilation. Really I don't see much point in trying to ...
Fresh Codemonger's user avatar
7 votes

Are there home radon detectors that meet specific testing criteria?

Well, on the one hand, radioactive decay is a statistical process, so the closer you look, the more variation you have. Longer averaging times smooth out that effect. Here's my last 100 hours with the ...
Ecnerwal's user avatar
  • 218k
6 votes

Radon system water leak in attic

Vent pipe generally are built to accept rain water entering the top. If the leak is coming from around the outside of the pipe where it penetrates the roof then you need a better roof flashing. I had ...
Fresh Codemonger's user avatar
5 votes
Accepted

How to Identify an Unknown or Poisonous Gas

Every time me and my colleagues enter this room if the meeting is over ~30 mins we leave with symptoms of fatigue, dizziness and a reduced mental ability, it takes about 1-3 hours to overcome these ...
Machavity's user avatar
  • 24.9k
5 votes
Accepted

How to install radon system with sump pit with no incoming drains

If your sump pit extends into a layer of crushed stone, rubble and whatever else is under the concrete of your basement slab, then I have what you have. Except my radon was 55 pCi/l before remediation....
MTA's user avatar
  • 11.4k
4 votes

Why is my Radon level high even with passive ventilation in place?

Radon is serious business But at least there's some cool science around it. Ever wonder why volcanos exist? Why is the earth hot? Turns out it is radioactive decay. When God created the earth He "...
Harper - Reinstate Monica's user avatar
4 votes

Can I cover these pipes in my basement floor with concrete?

If you are going to concrete this, you need to extend the sewer cleanout or you'll be taking a hammer to the concrete when you need that (if you even remember where it is, then), and you'll need to ...
Ecnerwal's user avatar
  • 218k
4 votes
Accepted

Radon abatement complete, but contractor used weird wiring?

That is 100% a code violation. A flexible cord CANNOT be used as a substitute for permanent wiring. The means of disconnect, or service disconnect, is the switch outside. They should have simply hard ...
Speedy Petey's user avatar
  • 16.4k
4 votes
Accepted

Loud Radon System Noise

If you can hear it, then it's broken. You probably have a broken fin on the blower blade/impeller or a failed bearing. Get someone to check it out before it completely fails.
longneck's user avatar
  • 21.3k
4 votes

Should I be worried about radon while I live on the 9th floor?

Threats to health can be scary. But in this case, you'll want to keep on learning about radon. Learn what it is, exactly; learn where it's found in terms of what part of the building, and how it's ...
Harper - Reinstate Monica's user avatar
4 votes

To mitigate radon, is a "positive" basement pressure possible during balancing?

Ventilation/ pressurization based solutions can be advised, and often are in commercial design. In residential a reduction of 50% average Radon readings is usually considered an upper limit with HRV/...
RadonBC's user avatar
  • 61
4 votes

Is there a way to color Radon to see where it enters and moves?

Radon is a noble gas and won't be affected by dyes like that. You could rent a smoke machine and see how the air moves. However the source of the smoke will be of your choosing. Not where the radon is ...
ratchet freak's user avatar
3 votes

Is this pipe in my basement floor intended for radon mitigation?

Yes, your area is known for radon and it It looks like pipe is the rough-in for a radon system. When we install radon piping, we install a series of perforated pipes embedded into gravel in the ...
Lee Sam's user avatar
  • 23.3k
3 votes

Can I cover these pipes in my basement floor with concrete?

My basement is quite tightly sealed (it's a newer house), and the cleanout hatch like yours is screwed down piece of plywood, which is caulked all around. I suggest you do something like that, too. ...
haimg's user avatar
  • 1,193
3 votes

Is it normal to have flooding in basement after radon mitigation system installed?

The radon pipe should be tightly sealed through the basement floor. If that gap you identified goes though the floor, then it should be sealed up because the system is supposed to vent radon from the ...
JACK's user avatar
  • 81.7k
3 votes
Accepted

Causes of radon in the basement of a newer home?

Concrete is Porous this is why we put vapor barriers down and foundation drains because if there is moisture it will permeate the concrete. Doesn’t that mean the foundation is not done correctly? No ...
Ed Beal's user avatar
  • 103k
3 votes

Discontinuous footer?

Let's see - I guess the actual question is whether it's possible the footer is in sections, and whether that's norma/safe? Safe - well, 20 years and the house is staying put, so probably it's safe. ...
Ecnerwal's user avatar
  • 218k
3 votes

What is this black box on top of my radon fan?

Since you're replacing the fan anyway, remove the black box and check it out. It could be a check valve or a filter. It looks like it just unscrews and you could see what's inside. There might be ...
JACK's user avatar
  • 81.7k
2 votes

Loud Radon System Noise

Some thoughts: It might still be broken, but it sounds like it may have been making that much noise before and you didn't notice it. You probably should check to see if there's some internal problem ...
user3224303's user avatar
2 votes

Which RadonAway fan is this?

I spoke to the manufacturer this morning and they confirmed that a small number of units went out with the incorrect part number but with the correct model number. So this is the RP265.
Eli Lansey's user avatar
2 votes
Accepted

Fill hole in slab beneath tub to reduce radon?

It would be cheap and easy ( my favorites for any home improvement) to spray urethane foam under the tub. You can get it at any lumber/hardware store. It would certainly reduce the amount any gas that ...
blacksmith37's user avatar
  • 8,311
2 votes

Why is my Radon level high even with passive ventilation in place?

Pipes are installed under your house and extend up through the roof. If radon will passively escape and lower your radon gas level, then you’re fine. If the radon gas level does not go down, then you’...
Lee Sam's user avatar
  • 23.3k
2 votes

Should I attempt to repair a leak in my radon mitigation system's pipework?

Since it's low-volume and outside I wouldn't worry about it, but Ed's right that there's some indication of blockage. There should be very little back-pressure on that pipe. However, I've never seen ...
isherwood's user avatar
  • 139k
2 votes
Accepted

2-4 inch gap between crawlspace slab (floor) and surrounding wall - Why?

Almost certainly for drainage. Carrying any water leaking in from the walls to the sump. My understanding of radon mitigation would be that this gap and the sump pit need to be sealed from the top ...
Ecnerwal's user avatar
  • 218k
2 votes

Causes of radon in the basement of a newer home?

As I understand it, you cannot possibly "tighten" your basement enough to prevent radon from getting in, there is no way to attain a radon level of zero.
JRaef's user avatar
  • 15k
2 votes

Causes of radon in the basement of a newer home?

I don't think you can build a slab that can prevent radon from entering. The vapor barrier under the slab is what keeps the radon and other soil gasses out. It is really difficult to have perfect ...
Fresh Codemonger's user avatar
2 votes
Accepted

To mitigate radon, is a "positive" basement pressure possible during balancing?

Yes you can create a positive pressure and that may be a good thing as more of the air intakes will be on the upper floors. The difference between positive and negative is the amount of intake verses ...
Ed Beal's user avatar
  • 103k
2 votes

Loud thumping sounds coming from radon pipe

Without seeing the details of your piping, can't say for sure where the water might be coming from. But, the "intake" pipe for the radon exhaust, usually coming off of a sump pump well or ...
SteveSh's user avatar
  • 6,902
2 votes

Loud thumping sounds coming from radon pipe

RadonBC here. Absolutely get your hopefully certified mitigator back on the job. They should "want" to know all these details. One good reason for attic fans is that you shouldn't hear them, ...
RadonBC's user avatar
  • 61

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