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Condensation problem

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Posted by Jeff Palmer on August 4, 2006, 11:57 am
 
I've built a passive solar home in Central NY State. It is 48'X30' on a
4" slab. The construction is pole barn construction with R-40 walls and
R-55 ceiling. The house works very well in the winter but this summer,
with the high humidity, we have a problem. The slab stays cool in the
summer and when the temp and humidity are high (which normally is
unusual for this area) we get condensation on the slab floor as well as
condensation on cold water pipes and toilet.  This has caused mold to
grow on the walls close to the floor. I've been thinking about some
kind of coating for the pipes and even possible the floor. Any
suggestions short of a dehumidifer or air conditioner to solve this
problem?


Posted by News on August 4, 2006, 3:33 pm
 


Improve the ventilation.  Moving air will take the moisture laden air away.


Posted by Jeff Palmer on August 4, 2006, 4:06 pm
 
I don't understand why this would help. If the dew point is in the mid
70's, I would assume any outside air coming into the house would be
just as humid and the moisture would condense on the relatively cooler
floor and pipes. We don't have any problems until the de point is quite
high.


Posted by News on August 4, 2006, 7:10 pm
 

Take readings inside and out. It is invariably more humid inside due to
people and water in the house. Ventilation usually gets rid of it.

A relative of mine was getting this one their walls in humid Hong Kong.  It
was either install A/C to de-humidify or ventilate more to extract the
moisture laden air.


Posted by Morris Dovey on August 4, 2006, 11:08 pm
 Jeff Palmer (in 1154707592.828513.67680@m73g2000cwd.googlegroups.com)
said:

|| Improve the ventilation.  Moving air will take the moisture laden
|| air away.
|
| I don't understand why this would help. If the dew point is in the
| mid 70's, I would assume any outside air coming into the house
| would be just as humid and the moisture would condense on the
| relatively cooler floor and pipes. We don't have any problems until
| the de point is quite high.

_You_ are the problem. Every time you exhale the air becomes more
humid. The only other solution would be to stop exhaling [inhaling is
not a problem :-)]

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto



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