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S-F · 12-02-11, 03:31 PM

although I'm not a radon remediation expert I think you will benefit by air sealing those sump holes. Radon stacks rely on the slab being whole so the pressure under it can be dropped a little bit enticing the radon to go out the stack. When they put one in at my house they sealed up the hole in the floor where the municipal water comes in. They used a board and some 1 part foam. Air sealing doesn't have to be permanent. Seal up and cracks in the slab with an appropriate material and build some covers for the sumps. Then install a proper radon stack with a fan in the attic. With the levels you are talking about you will need a full time fan. The caps that go on top and look like a jiffy pop bag that create vacuum when being spun by air won't cut the mustard. My house had a reading of 19. It took the guys two separate penetrations in the slab sharing one stack to bring it down to a safe level. Whatever that means. No radon is safe.

12-02-11, 03:31 PM	#4
S-F You Ain't Me Join Date: Nov 2009 Location: Northampton MA Posts: 662 Thanks: 6 Thanked 71 Times in 58 Posts	although I'm not a radon remediation expert I think you will benefit by air sealing those sump holes. Radon stacks rely on the slab being whole so the pressure under it can be dropped a little bit enticing the radon to go out the stack. When they put one in at my house they sealed up the hole in the floor where the municipal water comes in. They used a board and some 1 part foam. Air sealing doesn't have to be permanent. Seal up and cracks in the slab with an appropriate material and build some covers for the sumps. Then install a proper radon stack with a fan in the attic. With the levels you are talking about you will need a full time fan. The caps that go on top and look like a jiffy pop bag that create vacuum when being spun by air won't cut the mustard. My house had a reading of 19. It took the guys two separate penetrations in the slab sharing one stack to bring it down to a safe level. Whatever that means. No radon is safe. Last edited by S-F; 12-02-11 at 03:41 PM..