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What could cause radon levels to be higher on the 3rd floor than the 1st and 2nd?

Details: It's a 3 story building. Each apartment has its own HVAC system. There is no shared ventilation system. The foundation is a slab. The radon levels on all three floors were measured ...
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333 views

How should I seal and insulate a crawlspace to mitigate radon and allow for storage in the space?

Background: I recently bought a house built in 1996. It has a 1480sq ft (approx) living area, which is the same as the crawl space size. The location is in the Kansas City metro area. The yard is ...
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3“ radon vent 4” roof jack

I have installed a 4" oatley vent flashing and drilled holes in roof and walls with a 4-1/8 bit. Unfortunately the radon coupler out of the concrete is only 3". This was a plumbing mistake and long ...
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Suggestions/advice on vapor barrier product to use?

In the basement of my house (built in 1900) in NE Ohio...Half of the basement floor is finished, the other half is dirt floor covered by a few inches of crushed stone gravel. I had a mold issue, so ...