DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > HVAC > Questions about radon mitigation

Help Support House Repair Talk by donating using the link above.
Thread Tools Search this Thread
Old 06-30-2009, 07:55 AM  
Junior Member
Join Date: Jun 2009
Posts: 2
Default Questions about radon mitigation

Hi All! New homeowner and new to this forum. I have been doing a lot of research on radon since buying my first house last fall. The results of the inspection showed I had a 4.2 pCi/l radon level. I believe this was a short term test and so I had a long term tested performed to see the "actual results." This came up with nearly the same results (4.6 pCi/l). I know the level isn't too high, but it is above what is recommended. So, I'm going to do something but am hoping to get a few questions answered first.

1. What is the easiest way to determine how much cfm is needed? I have a Split-Level 1800 sq. ft. home, 700 basement, 500 Main and 600 Upper Level. My sump pit is in the crawl space with a fairly easy exit point, except for a deck on one wall. Therefore, I would rather run the pvc a longer distance (15-20 ft, 2-3 elbows) and exit out the back since I plan on extending the deck to the front of the house as well. All the radon fans I see don't have very high cfm ratings, but have a high inches w.c. reading. I assume this is because it just needs to create a "better" negative pressure reading than the house does? I have an HRV and a new 90+ furnace that brings its own make-up air in, so my house shouldn't be too negative???

2. What is the better procedure; Mounting the fan inside or outside, and why?

3. This brings up another question; Is there a reason I couldn't terminate the pvc out the wall (fan inside) and not above the roof line?

I'm sure I am forgetting something but for now this will do. If any of you can help me, I would appreciate it!


JohnBoy is offline  
Reply With Quote
Old 06-30-2009, 02:56 PM  
inspectorD's Avatar
Join Date: Dec 2005
Location: Litchfield, CT
Posts: 4,490
Liked 265 Times on 209 Posts
Likes Given: 772

Default radon

Try, Radon | Indoor Air Quality | US EPA.
The pipe needs to extend past the roof line to help equalize pressure if the fan fails, and to exaust the radon higher if possible.
The entire basement needs to be sealed, sump included.
As far as how your house is pressurized? Only a blower door test will give you results you need.

As far as DIY on a radon system goes, it is better left to the pro's. This way there is documentation for a future owner when you go to sell. Folks are funny that way. Otherwise you run may run into to many issues.
Good luck.
Just My
Made in the
inspectorD is offline  
Reply With Quote
Old 07-01-2009, 06:56 AM  
Junior Member
Join Date: Jun 2009
Posts: 2

Thanks inspector, I'll check it out.
JohnBoy is offline  
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
DIY Radon Mitigation Help Fireguy5674 General Home Improvement Discussion 3 02-03-2015 10:43 AM
DIY Radon Reduction radonguy General Home Improvement Discussion 4 03-24-2010 07:17 AM
Radon Abatement estapelfeldt Introductions 3 08-20-2008 01:26 PM
Radon abatement plan ironhat General Home Improvement Discussion 1 03-22-2008 10:02 PM
Radon Mitigation Joe_T Framing and Foundation 7 07-14-2007 07:50 PM

Newest Threads