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Old 05-24-2017, 09:01 AM   #16
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Re: Drain Dehumidifier into sump pump pit

Originally Posted by skb007 View Post
Another Question:
I also noticed that previous owner has dumped the HVAC condensate pipe into the french drain. I am thinking to combine this pipe with the dehumidifier pipe as well. Is this a bad idea?

You guys think this whole thing will require some kind of permit?

No problem combining the two, actually better since there would be less chance of the trap drying out.
I did misspeak calling it a pump, it is a fan as Joed mentioned. And you may or may not have one. Might be in the attic crawl space. Is there a readily visible manometer hose sticking out of your radon pipe?

Last edited by Yodaman; 05-24-2017 at 09:04 AM.
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Old 05-24-2017, 09:21 AM   #17
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Re: Drain Dehumidifier into sump pump pit

A radon mitigation system must have some way to suck away air that is likely to contain radon. Typically it is a fan of some sort but the suction must not be so strong that the liquid in the manometer pictured above is sucked up into the system and drops to the bottom of the pipe shown. If you make a hole in the sump pump pit lid to introduce the outlet pipe of your dehumidifier, you may need to fine tune the suction fan.

The primary target of the radon system is the air inside the (under floor) French drain system. Every once in awhile the basement air should be changed independently of the radon system using a window fan or something like that. In a manner analogous to the sump pump preventing ground water from seeping up onto the basement floor, the radon system minimizes ground air seeping into the basement, although the radon system relies on suction versus the French drain relying on gravity.

The sump pump system is sealed so the radon fan does not waste its effort exhausting basement air in general, wasting home heat as well during the winter. For this reason also a dehumidifier drain hose needs a trap.
Stick to your lawn watering schedule until it really pours. Otherwise the storm might miss and the part that gets watered last (3 days away?) will dry up.

Last edited by AllanJ; 05-24-2017 at 09:25 AM.
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