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Discussion Starter · #1 ·
I live in the Atlanta area with a partially finished walkout basement - about 2,000 sq ft. The basement has its own HVAC system with a 65/pint/day dehumidifier plumbed in, and I run another 60/pint/day portable unit. Even with these 3 systems running all the time, humidity tends to be around 60%.

I get almost no visible water penetration after heavy rains, and the grading and downspouts seem to effectively carry water away from the foundation.

In an effort to reduce humidity further, I figure my next step is to try to seal the exposed blocks as much as possible, as maybe the humidity in my basement is being drawn through the masonry?

On 2 of the walls, there is a completely open course of hollow blocks. My plan is cap these with some 2" concrete cap blocks and mortar, then seal all concrete with drylok.

Is this a good idea, bad idea, or pointless? I'm tired of the humidity and the odor, and I feel like I've been combating the symptoms with dehumidification and not treating the source. It feels like I could remove 2,000 gallons of water per day from the air and I'd still be wet. What gives?

 

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· retired framer
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That might be the problem but is the air from upstairs mixing into basement air, what is the temp of air upstairs and down stairs and what is the humidity upstairs.

I don't know the math but upstairs humidity can be a problem. Humidity goes up when you cool the air.
 

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Discussion Starter · #3 ·
Basement thermostat set to 72. Upstairs set to 74. Haven't measured upstairs humidity but it's dry and comfortable in general. No complaints or issues there.

The door to the stairs down to the basement is closed 24/7 except when going through it of course, and it has a typical gap at the base of an interior door that lets the air mix, but its not much. There doesn't appear to be a big differential on either side of the door. There may be other voids between the floor that allow for mixing but nothing substantial. They truly feel like 2 totally different air masses. One is wet and a bit smelly, the other is dry and comfortable.
 
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