Questions tagged [radon]

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Radon Fan Getting Noisy & Other Questions

We are wrapping up a French drain installation, and our radon fan has been much noisier for the last day or so. The concrete has been poured over our new French drain piping, with the sump pump hole ...
Smiz93's user avatar
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1 answer
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What is this black box on top of my radon fan?

I am in the process of replacing my RadonAway RP145 fan (15 years old). What is this black box on top of the fan? I cannot find any info about what it is used for and if that needs to be replaced too.
joz1911's user avatar
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Radon and moisture mitigation when joists are on dirt

In this house in a dry climate, the floor joists are directly on dirt, and the floor boards are just one layer (no subfloor). After 150 years, there is no rot, and there has of course been substantial ...
Star Ford's user avatar
1 vote
1 answer
525 views

Access port to sealed-off sump pump with radon mitigation system

Clueless first time homeowner here. I purchased a home that has a sump with an attached radon mitigation system. The entire cover of the sump is sealed with caulk, so it's impossible to test if the ...
Dewitt83's user avatar
0 votes
1 answer
772 views

Sump Pump Venting After Sealing for Radon

Apologies if this has been asked here before, my first time on the site coming from Reddit. I just built a new house and know that the radon levels are high due to neighbors doing testing / the area ...
bchicken's user avatar
0 votes
1 answer
221 views

concrete sealant for radon

Radon is diffusing up from underlying soil/rocks through my basement's concrete slab. What is an effective paint/spray application to stop this? I see RadonSeal (sodium silicate) ads claiming to help ...
bobuhito's user avatar
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1 answer
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How can I identify the purpose and terminal location of a PVC pipe from my basement slab?

Our house has a 3 inch PVC pipe running from the basement to an unknown location in the house. It has no T or Y junctions connecting into it. It does NOT go into the attic. The only pipe into the ...
radonhelpplease's user avatar
3 votes
3 answers
600 views

Are there home radon detectors that meet specific testing criteria? [closed]

This is just an overall question about home radon detectors. Where 10 years ago a topic like this might have seemed off topic (radon detection services sent specimen to labs - charcoal kits). It ...
DMoore's user avatar
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2 answers
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Discontinuous footer?

During the installation of a radon mitigation system, the installers noted the area of the suction pit (not shown) didn't have a footer under the foundation wall. It seems that other parts of the slab ...
Nate's user avatar
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1 answer
1k views

Radon fan suction vs flow rate?

My house has a radon system (sub-slab depressurization) with two suction pits and 3" Schedule 40 piping installed by the previous owner. The system utilized a Festa AMG Legend and the manometer ...
Nate's user avatar
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2 answers
362 views

Radon suction vs pressurization

Normal radon mitigation sucks out the air from underneath a house's foundation. What if I ran the fan in reverse to blow this same air outward instead of sucking it upward? It seems either direction ...
bobuhito's user avatar
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2 votes
3 answers
504 views

Do I need to retain access to this pipe in my basement when building a shower? [closed]

I have a PVC pipe probably 4 in coming from basement floor and going to roof. I am wondering if I need access for this. I am putting a bathroom and current plan was to put tiles shower on that wall. ...
boniam's user avatar
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3 votes
1 answer
2k views

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

We have high radon levels (~10) and I would like to add a mitigation system. There is a sump pit in the basement, but there are no drains flowing into it (i.e. it's getting water directly from floor ...
MathStudent's user avatar
1 vote
1 answer
234 views

mitigating radon in basement with joist & plywood floor

I bought a vacation home in the mountains and have found that it has a dangerous radon level (7.4pCi/L). The house has an 800 sq-ft unfinished basement, including a rough plywood floor over treated ...
RustyShackleford's user avatar
1 vote
5 answers
1k views

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

I'm trying to lower radon gas levels at home. I currently have one Airthings Wave Plus device in one room and I'm waiting for a second one to triangulate radon sources, but I'm looking for another ...
Juan Alonso's user avatar
4 votes
3 answers
2k views

Radon system water leak in attic

In my attic there is (what I think is) the fan part of a radon mitigation system. There's a lip, and water pools there, then overflows and gets water in the attic. It seems to be worse when it rains. ...
Sam H.'s user avatar
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1 answer
564 views

Radon test results came back at 26 pCi/L, is it safe to use my basement?

My Radon Test Report just came back and it says that my basement has 26.2 pCi/L. The basement is where we exercise, so I'm wondering if it's safe to do so. I know the acceptable levels is dramatically ...
Brittney's user avatar
1 vote
2 answers
2k views

Radon fan has rhythmic woo-woooo-wo noise

We recently had a RadonAway 501C fan installed for sub slab depressurization in our 1923 Cape. Our readings dropped immediately from 6 - 13 (average 9) to 0.3-1.5 (averaging 0.7) We did expect that ...
Zipper1365's user avatar
1 vote
1 answer
163 views

Air-sealing basement slab weeping tile access for radon

I have a pretty high levels of radon in the basement (~400 Bq/m3 when windows are not open), so I want to seal obvious entry points, one of which is what looks like a 10 inch weeping tile cleanout ...
Eugene's user avatar
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1 answer
196 views

Radon Levels Remain Elevated

I recently purchased a home. During the inspection there was measured radon levels of 6.3 PiC/L. After having a professionally installed radon mitigation system, an electronic sensor indicates an ...
FooAnon's user avatar
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1 vote
3 answers
2k views

Loud thumping sounds coming from radon pipe

Our house had an existing radon pipe (passive) and high radon levels. We had a radon mitigation company assess the system. He installed a fan to the existing pipe. The fan is in the attic. Since the ...
LCB409's user avatar
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3 votes
2 answers
3k views

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

Our basement has low-moderate radon levels, fluctuating typically between 1.5 - 4. We do have a subslab mitigation pipe, but it doesn't work great. For other air quality reasons, we decided to ...
Adam Hughes's user avatar
-1 votes
4 answers
336 views

What are the pros and cons of getting a radon inspection before buying a home?

Discussion I have had with some of my partners. We understand what radon is, what causes it, how to mitigate it and the health effects it imposes. These are givens and a different question. My ...
DMoore's user avatar
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3 votes
3 answers
264 views

Causes of radon in the basement of a newer home?

We are in the process of (maybe) buying a home. It is a newer (2007) home in Northern Wisconsin with an insulated concrete form (ICF) basement in red clay. We just got the radon test back and the 2 ...
TBP's user avatar
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1 vote
2 answers
58 views

Is it correct for air to flow into home from under an addition?

I have seen multiple houses sitting on concrete basements or slabs where additions were added on to the house in the 1970s-80s and air flows directly from under the addition to inside the house. The ...
user35358's user avatar
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0 votes
1 answer
138 views

Radon remediation in a part-time home

We have a second home that we use approximately 1 week/month year-round, and more in the summer. When we purchased the home in 2019, it was tested at 9pCi/L, and a remediation system was installed ...
TomG's user avatar
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1 vote
3 answers
333 views

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

I've recently heard of this threat to our health and I'm trying to educate myself on how to best protect myself and my family from it. I've been living for the past few years in a rented apartment in ...
user7519314's user avatar
2 votes
1 answer
383 views

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

about a year ago I had my crawlspace conditioned. Among other things, the company put in a concrete slab for the floor and added a sump pump in the corner. The strange thing is, there is a 1-4 inch ...
Andrew's user avatar
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1 vote
1 answer
185 views

How to Identify an Unknown or Poisonous Gas

Situation My office has a meeting room that is located on the ground floor with inward facing windows towards the bottom of very small and stuffy open air interior. This area is surrounded by six ...
James Scott's user avatar
1 vote
1 answer
4k views

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

I have been experiencing flooding in my basement. I think the water is coming from the pipe installed in slab for radon mitigation. I don't believe the basement was flooding before (I just closed on ...
Ruth's user avatar
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0 votes
2 answers
502 views

slab heat pipes and radon reduction

My house has slab heat and the pipes come out of the dirt and go to the heating unit. This is located in my basement and I'm wondering how to seal it to help reduce radon entering the house.
Ann's user avatar
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0 votes
1 answer
776 views

Loud and HOT radon mitigation fan

I just got a Radon mitigation system installed and it is very loud, much louder than the AC unit that it sits next to (fan is installed outside). The housing of the fan after only a couple of hours ...
Mike N's user avatar
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0 votes
1 answer
860 views

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

My radon evacuation system has been in place for about 10 years and it operating efficiently. However, the caulk that was used around the outdoor fan has deteriorated. When I cleaned up the area to ...
KATHLEEN M MAKA's user avatar
3 votes
4 answers
408 views

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

We have about 6 PVC pipes with Aqua covers on them that were installed when we built our log cabin. We were told that they were for the Radon to escape. We just had a 24-hr test done and the ...
Ellen.  Gove's user avatar
1 vote
2 answers
151 views

Concrete vs suspended floor over vapor barrier

Our house has a sizable crawl space large enough to use as storage. The space has no slab covering it, but due to radon issues, it does have a vapor barrier to maintain a suction for the radon ...
Jance's user avatar
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1 vote
5 answers
3k views

Radon manometer shows negative pressure when off

I had a Radon mitigation system installed last week. When I turned on the fan it was all working great. A few days later the pressure level started to drop a little each day, until day 4 it was even. ...
Darin Friesen's user avatar
4 votes
1 answer
5k views

Ice In Radon Mitigation System

I have a fan powered radon mitigation system installed in my house. It was installed in 2016 and I have not had any issues with it until this winter. I live in northern Iowa where we have been ...
cyclops's user avatar
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0 votes
2 answers
459 views

Radon in water mitigation

I need to install a Radon in water mitigation system. Is there a Do It Yourself way to do this with a simple aeration or filter system. I already have a pH adjustment system in my basement ( Calcium ...
DEEM's user avatar
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1 vote
1 answer
2k views

Sump pump pit fill-in / Radon mitigation

I live in a partially below-ground finished basement of someone else's house. I have recently tested for radon and found the level to be elevated. There is a 2-foot deep sump pump pit in the ...
Joe's user avatar
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1 vote
1 answer
537 views

Which RadonAway fan is this?

I am replacing my RadonAway fan which has seemingly burnt out. However, the sticker on the current fan identifying the part number is self-contradictory: It's marked as an RP265, but part number ...
Eli Lansey's user avatar
0 votes
0 answers
1k views

Running 4" PVC pipe through foundation wall

I am installing a radon mitigation system and my plan is to go off of the sump pump (I bought one of those covers that seals it up good and lets you pass a PVC pipe though it). The easiest thing to ...
user41178's user avatar
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2 votes
1 answer
1k views

Fill hole in slab beneath tub to reduce radon?

We recently discovered that our downstairs bathtub has a large hole in the slab beneath it where the tub drain and a few other pipes go into the dirt. We had a radon mitigation system put in a few ...
Jon Garvin's user avatar
0 votes
2 answers
871 views

Radon fan with submersible pump. Is this normal?

New home owner here. When I bought my home, they did the radon test and found the levels high, so a radon fan was installed. I recently investigated the radon fan setup, and discovered that it seems ...
HumblestOne's user avatar
1 vote
1 answer
156 views

How could the location of a radon abatement hole impact its effectiveness?

The radon level in my partially finished basement is from 8 to 11 pCi/L. I'm looking to have this installed professionally by contractors and the recommendation so far is to create the hole near the ...
BlueRidge's user avatar
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1 vote
1 answer
2k views

Has anyone heard of or have experience with a reverse pressure radon mitigation system for your home?

We purchased a home that had one installed during construction. I'm just wondering if people have had a positive experience with this type of system and can explain how it works. We just had a radon ...
Amy E's user avatar
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1 vote
1 answer
351 views

Does this vent cap limit passive air flow?

I am looking at various vent covers for my house. I have a 3" Plumbing vent stack and a 4" Radon vent stack. The radon system is passive, which means I do rely on a chimney effect along with the ...
CCCBuilder's user avatar
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2 votes
2 answers
3k views

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

I have a 18in by 18in area in my basement floor that is open dirt. The house is measuring high for radon so I need to seal this up as it is a major source for radon getting into the house. There are ...
Skc45x's user avatar
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1 vote
3 answers
39k views

Loud Radon System Noise

Our radon system is right under/outside our 6 month old's bedroom. Over the fall and winter I never heard it but now it is running a lot and it is very loud and it is affecting our daughter's sleeping....
salisboss's user avatar
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5 votes
4 answers
20k views

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

This pipe emerges from the concrete slab floor in a corner of my house's full basement. I believe it's a 4" polyethylene sewer pipe (narrow walls, black interior, white exterior). I can't tell if it's ...
Michael H's user avatar
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0 votes
1 answer
70 views

How can I fix and cap my undersized sump?

So, I have an old Sump in my house (built 1960), that currently does not have a functioning pump in it. I plan on replacing the pump and running new exit pipe however, I'm stumped on how to close/cap ...
TheNorthern_Light's user avatar