Radon system

11 years ago

Can somebody tell me why there's condensation outside the radon pipe/fan in the attic? I was told there should be condensation on the inside during winter but it's on the outside. It was raining for couple days when it occurred. I understand the summer humidity can make it sweat on the outside but is humidity from the precipitation have the same effect during winter?

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Comments (5)

BrianKnight
11 years ago
Your radon stack exhaust termination is in your vented attic space?
ahold
Original Author
11 years ago
Yes, located in unfinished vented attic. And I wonder if will even condense inside the wall where the vertical pipe runs through
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BrianKnight
11 years ago
Well it shouldnt be terminated inside the attic for one thing. Condensation on outside suggest high humidity in the attic which is peculiar for the wintertime and suggest that there is a lot of air "communication" from the conditioned space below. Not good for Indoor air, energy costs or the radon situation in general. How old is the house and have you ever air-sealed the attic floor/ceiling plane? I would also consider turning down the radon fan if possible.
dkiehl
11 years ago
I have never heard of venting inside. I thought inside venting was against code. Since Radon gas is heavier than oxygen now you have 2 sources entering your house.
zver11
11 years ago
Venting inside is definitely against code! Eliminating radon is about dissipating it in the atmosphere and not allowing radon to collect in any enclosed space as concentrating radon can lead to creation of other undesirable radioactive products.
Since radon system is sucking air from under the slab, it follows that it collects moisture from the ground (This leaves a drier and less humid basement as a bonus). This moist air is being dumped in your attic. If this builds up, it can lead to mold problems. Need to extend pipe outside. Exit should not be near an openable window. PVC drainage pipe is cheap, so extending it should not be expensive. If need to go through roof, a proper flashing boot must be used--much messier than if can go through wall(silicone caulk around hole is enough)