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Thread: crawl space water condensate

  1. #1
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    crawl space water condensate

    hi all, we just had vapor barrier laid in crawl space...old pipes just dripped in to mud this is a 31 suite apartment building and we are wondering if we can keep letting it drip to mud with a little catch basin to leech into mud under polly...as the building cannot afford to have it plumbed to drains...any help is appreciated there are 30 pipes from evaporators coming through floor to crawl space...built in 1962

  2. #2
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    Why was the vapor barrier installed?
    Was the crawl space too humid and getting mold growth?

    This seems insane and unhealthy.

    I have seen cond drip into crawl spaces only in the low end trailer houses.

  3. #3
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    Are the pipes leaking or just condensation?

    Repair the leaks and insulate / seal the pipes

  4. #4
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    Mud is already saturated and won’t hold much more water. An air conditioner can generate 30 gallons of water in a day when under high load conditions and you have 30 of them! You will soon have a swimming pool under the plastic. You need to investigate a good sized sump pump.
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  5. #5
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    I would expect that an a/c would generate about 3 lbs. of moisture per ton or cooling per hour. The total amount of moisture per day could be 2 tons per unit times 12 hours per day, maybe 12 gallons per unit or 360 gallons a day. This has been going on for years, is there any standing water? If not, the water must be draining away. If soil is on a gravel base, may not be a problem.

    It the idea of a vapor barrier is based on the concept that earth will wick liquid from the an water source that could be 1,000 ft below surface. Covering the earth with a vapor barrier stops the evaporation into the air under the under the structure. Most earth under a good vapor barrier is wet because the water is unable to evaporate to the air.

    After the vapor barrier is in place, if water is not visible, it most be soaking into the soil.

    As long as the water is below the vapor barrier, should not be a problem moisture from the wet soil??

    These are concepts that we have be using for many years.

    If you cover a pool with a vapor barrier in a structure, the humidity is easily controlled by a dehumidifier. Same applies to a crawlspace. Beware of outside air vents that allow outside high dew point air into any space that you want to keep dry. You will need some dehumidification to maintain a desire %RH.

    Make sense??

    Regards Teddy Bear
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

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  7. #6
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    Thread Starter
    we installed vapor to cut down mold and rusting problems...we were concerned about the water buildup...we have 2 sump pumps in crawl space feeding to main sewer line... we could run lines to them but it would be costly and make a mess of lines everywhere but i dont see any other way thanks for responding every one
    sorry it is a mud base no gravel

    each suite has a water tray that drips into pipe to crawl space...most units are running 24/7 it is chilled water not a a/c unit we have a chiller outside it is 10 years old

  8. #7
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    Thread Starter
    we installed vapor to cut down mold and rusting problems...we were concerned about the water buildup...we have 2 sump pumps in crawl space feeding to main sewer line... we could run lines to them but it would be costly and make a mess of lines everywhere but i dont see any other way thanks for responding every one
    sorry it is a mud base no gravel

  9. #8
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    You might check local building codes for approved solutions for your local conditions. Rust, mold, and building failure may effect occupants. This makes code compliance an issue.

    Also consider your local outdoor air's effect on the moisture levels. Outdoor dew points of +60^F make indoor spaces damp and may grow mold or rot wood. Some add dehumidifiers to maintain <60%RH to reduce these problems.

    Exposed water inside a structure is destructive.

    Keep us posted.

    Regards Teddy Bear
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  10. Likes baby b liked this post.
  11. #9
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    cant image pvc is so expensive you cant run a line. could run 1 1/2 or 2" pvc and tee into line for each apartment.

    like teddy said/ inplied, vapor barrier will not completely stop moisture issues if it is humid outside, surfaces and the top of vapo barrier will sweat if humid air from outside has access to crawl.
    Col 3:23


    questions asked, answers received, ignorance abated

  12. #10
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    Quote Originally Posted by xerxies View Post
    hi all, we just had vapor barrier laid in crawl space...old pipes just dripped in to mud this is a 31 suite apartment building and we are wondering if we can keep letting it drip to mud with a little catch basin to leech into mud under polly...as the building cannot afford to have it plumbed to drains...any help is appreciated there are 30 pipes from evaporators coming through floor to crawl space...built in 1962
    That would defeat the reason you laid the vapor barrier.
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