Author Topic: Dehumidifier placement in a basement  (Read 133 times)

Mold Guru

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Dehumidifier placement in a basement
« on: November 16, 2017, 01:57:40 PM »
      So i am performing a mold remediation project in a home near the east coast. Two story house with large basement built in 1925. Home owner buys a dehumidifier for the basement (pretty nice unit) and the seller sends two workers out with the unit to 'install' it this actually consisted of setting the device on the floor, plugging it in, and placing the condensate line into a drain, which in this case turns out to be the sump pump reservoir. I am looking at this unit and notice that the intake on this dehu is positioned right at the sump pump floor cap. (This means that every time the machine turns on and pulls air into the intake, it will vacuum any contaminants escaping from the sump pump reservoir and blow it into the basement area where quite a bit of activity takes place.
      Anything sound wrong about this to you guys?

      PatrickJohnson

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      Re: Dehumidifier placement in a basement
      « Reply #1 on: November 17, 2017, 03:14:24 AM »
          @DavidSnell @Dominick Manieri @JasonYost @Devon Shubin (Go Viral Advertising)
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          Re: Dehumidifier placement in a basement
          « Reply #2 on: November 17, 2017, 03:25:34 AM »
              the dehu drainage line should not suck air or water.

              Dominick Manieri

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              Re: Dehumidifier placement in a basement
              « Reply #3 on: November 17, 2017, 06:33:21 AM »
                  seal the reservoir or re-locate the unit...and for the record the drainage line doesn't suck air or water, it actually releases water that the unit captures  ;D

                  Erin Craft

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                  Re: Dehumidifier placement in a basement
                  « Reply #4 on: November 17, 2017, 09:13:13 AM »
                      Dehumidifiers should be 10ft away from sump and drains. If not the dehumidifier will focus more on the drain and sump rather than the building.

                      JasonYost

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                      Re: Dehumidifier placement in a basement
                      « Reply #5 on: November 17, 2017, 11:05:04 AM »
                          Placement of a dehumidifier has to be determined based on the rest of the drying plan/system.  Without such considerations, the dehumidifier won't gather the humidity and remove it; the capture zone is too small (thus the cyclone effect used in general, elementary drying formulas).  When water sources are in an area that requires drying, they should (heck - even when drying isn't necessary) be sealed from the rest of the room they're located (so the moisture doesn't impact the environment around it or the drying system/plan). 
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                          Re: Dehumidifier placement in a basement
                          « Reply #6 on: November 18, 2017, 08:46:17 PM »
                              This also depends if there is a internal pump or if the dehu is a gravity fed drainage

                              Hannah84

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                              Re: Dehumidifier placement in a basement
                              « Reply #7 on: November 18, 2017, 10:42:24 PM »
                                  Should every house have a dehumidifier?
                                  I would like to know.
                                  Does anyone know?
                                  What creates the need for a dehumidifier?  Or, is it a humidifier?
                                  Thank you.

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                                  Re: Dehumidifier placement in a basement
                                  « Reply #8 on: November 19, 2017, 07:25:20 PM »
                                      It depends  on the humidity and dew point levels in the environment you live

                                      JasonYost

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                                      Re: Dehumidifier placement in a basement
                                      « Reply #9 on: November 20, 2017, 03:59:48 PM »
                                          Should every house have a dehumidifier?
                                          I would like to know.
                                          Does anyone know?
                                          What creates the need for a dehumidifier?  Or, is it a humidifier?
                                          Thank you.

                                          @Hannah84 in my professional opinion dehumidifiers aren't necessary in a properly constructed and ventilated building - unless responding to a leak of some sort.  Utilizing these devices to compensate for building inefficiencies won't work. 
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                                          Re: Dehumidifier placement in a basement
                                          « Reply #10 on: November 21, 2017, 09:51:42 AM »
                                              Jason is correctangular in my opinion. But we have to remember that this topic is about a basement which it also depends if it's an unfinished basement or a finished basement. How old is the basement was it poured concrete with reinforced rebar or is it cinder block. There's a lot of factors to consider

                                              Dominick Manieri

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                                              Re: Dehumidifier placement in a basement
                                              « Reply #11 on: November 22, 2017, 05:52:36 AM »
                                                  every basement should have a dehumidifier

                                                  JasonYost

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                                                  Re: Dehumidifier placement in a basement
                                                  « Reply #12 on: December 04, 2017, 04:05:36 PM »
                                                      Jason is correctangular in my opinion. But we have to remember that this topic is about a basement which it also depends if it's an unfinished basement or a finished basement. How old is the basement was it poured concrete with reinforced rebar or is it cinder block. There's a lot of factors to consider

                                                      All due respect, @Devon Shubin (Go Viral Advertising) it doesn't matter if the basement is interior-finished or not.  The moisture shouldn't be infiltrating the basement at levels supportive of mold growth, and dehumidifiers will not stop that.  The capture zone in relation to (1) moisture location and (2) accumulative levels of moisture prevent it from working as a measure to prevent mold growth (or water-damage to the foundation, for that matter).  One should seek methods to stop the water from coming in.  Mitigation is not the same a remediation (remedying the problem).  Let's not confuse people reading these posts into thinking it is.
                                                      Jason Yost, BS Occupational Safety & Health
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                                                      Dominick Manieri

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                                                      Re: Dehumidifier placement in a basement
                                                      « Reply #13 on: December 04, 2017, 05:15:25 PM »
                                                          wouldn't there be hydrostatic pressure in the basement causing concrete walls and floors to become slightly moist during the humid summer months, after heavy rain etc. its a basement, its under the earth

                                                          JasonYost

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                                                          Re: Dehumidifier placement in a basement
                                                          « Reply #14 on: December 04, 2017, 07:37:33 PM »
                                                              wouldn't there be hydrostatic pressure in the basement causing concrete walls and floors to become slightly moist during the humid summer months, after heavy rain etc. its a basement, its under the earth

                                                              @Dominick Manieri if the basement is built correctly (i.e., the water-proofing systems are in place and working correctly) there shouldn't be an issue that will lead to contamination or erosion. Where there are problems, mitigation (in the form of energy introduction, air flow and dehumidification) can help until remedial actions (i.e., water-proofing and ventilation) are completed.
                                                              Jason Yost, BS Occupational Safety & Health
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                                                              Re: Dehumidifier placement in a basement
                                                              « Reply #14 on: December 04, 2017, 07:37:33 PM »
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