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Old 07-30-2013, 01:06 PM   #1
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moisture mix?


What the best combo mix to make to put in crawlspce to help w absorbing moisture and humidity.there's many types of calciums and cabonates,to salts and even charcoal,am looking to make a big batch but not sure best mix ..
Any ideas for a good batch?

Those little ones with a few pellets won't cut it.
Thanks

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Old 07-30-2013, 01:13 PM   #2
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moisture mix?


Ventilation transports moisture very effectively and never wears out nor saturates.

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Old 07-30-2013, 04:00 PM   #3
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moisture mix?


Vents are open w dehumidifier going..the additional mix can help in areas far from dehumidifier though.those damprid containers fill fast.
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Old 07-30-2013, 04:17 PM   #4
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moisture mix?


Can you judiciously locate a small fan or two to move air in a deterministic manner from the stagnant areas to the in/out airflow path? Dehumidifiers sound illogical where there is ventilation.

Depending on where the unwanted humdiity is coming from, there are often paints or coatings that can act as effective moisture-diffusion-barriers, and prevent excess moisture intrusion in spaces one is trying to protect.
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Old 07-30-2013, 04:19 PM   #5
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moisture mix?


Just not going to work.
What will work is keeping the moisture from getting in there in the first place on the outside.
Adding a sump pump is often needed as well as a vapor barrier.
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Old 07-30-2013, 04:45 PM   #6
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moisture mix?


Dessicants absorb moisture. In a crawlspace, the idea is to remove moisture, not deliberately attract it. Trying to dehumidify a space by using dessicants without first controlling the entry of the moisture is just wasting money. Put some poly on the floor and a low velocity fan exhausting the space. It will get you more bang for your buck.
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Old 07-30-2013, 09:59 PM   #7
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moisture mix?


Black plastic/barrier is there. Had fan going too..outside humidity accumulates on plastic..
There are less vents for circulation since someone put addition on it,before me...less airflow circulating
..
I'll look at attic type fans for more circulation .

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Old 07-31-2013, 06:37 AM   #8
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moisture mix?


Then why not just add more vents?
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Old 07-31-2013, 05:06 PM   #9
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moisture mix?


Seal the vents. Then you won't have all the humidity coming into the crawlspace.
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Old 07-31-2013, 11:11 PM   #10
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moisture mix?


Where are you located?

If you do seal the vents, add an air supply as said already; http://www.buildingscience.com/docum...ance-and-codes

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Old 08-01-2013, 04:30 AM   #11
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moisture mix?


Quote:
Originally Posted by Gary in WA View Post
Where are you located?

If you do seal the vents, add an air supply as said already; http://www.buildingscience.com/docum...ance-and-codes

Gary
If a supply is added, then a return has to be added. or else the the house is depressurized, and draws in unconditioned fresh air.

Nice link Gary, thanks.
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Old 08-02-2013, 04:47 PM   #12
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moisture mix?


I'm in Tennessee so it does get a bit humid..right now its reading 55 as to humidity in crawlspace ..is that a good reading ?
dehumidifier on w PVC pipe drain working well.
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Old 08-02-2013, 09:22 PM   #13
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moisture mix?


55% is ok. Sealing the vents will enable you to gt it lower. remember, the humidity in the crawlspace will infiltrate into your house. So the lower you get the crawlspace humidity, the lower it will be in your house.
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Old 08-03-2013, 11:39 AM   #14
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moisture mix?


I'll seal em but
I thought in the summer they were to be open an closed in winter?
Other factor that may effect level is that central ac isn't working and ductwork is in crawlspace .
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Old 08-03-2013, 11:55 AM   #15
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moisture mix?


Opening them in summer, just makes the crawlspace warm/hot, and high in humidity. Keep them closed 24/7/365

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