We have a sump pump and interior and exterior drain tiles that run the perimeter of the basement. How about sealing the pit off and sucking the vapors through the pit?
Here's a pic of the inside tiles while under construction. Of course the house is finished apart from the basement.
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My uncle has a country place, that no one knows about. He said it used to be a farm, before the motor law.
'72 911T 2,2S motor
'76 BMW 2002
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