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  1. #1
    Join Date
    Oct 2009
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    Default how seal floor boots

    Our Atlanta home has high humidity (50-60%) causing mildew on some wooden furniture. Moisture may be coming from the crawl space up through openings on sides of the floor boots. How seal the boots?
    Thanks. Raleigh

  2. #2
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    Jul 2009
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    Northeast
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    Default Re: how seal floor boots

    The insulation on the Boots should go all the way to Sub Floor with no gaps. Have you had this problem in the past?? You could shop for a Crawl Space Dehumidifier, just Key word the same. How old is your A/C System?? They are made to take the Humidity out of the Air, Bryant for one will run on Low Speed and after the Humidity is out of the Air it ramps up to High Speed, excellent system. If your A/C is oversized it will Run, Stop, Run, Stop, continually called short cycling. I'm not sure but if this is happening it could just be redistributing Air without Dehumidifying it. Good Luck!!!

  3. #3
    Join Date
    Feb 2010
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    Eastern MA
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    Default Re: how seal floor boots

    Verify whether the crawl space is the problem. If it is, fix that.

    You may have an oversized air conditioner. Oversized air conditioners put out a lot of cold air, but don't run long enough to take the humidity out of the air. They make the rooms cold and create cold surfaces for the moisture to condense on. Oversizing is a common problem. AC contractors don't want to undersize because they will get complaints that the AC system doesn't cool the house. Oversize and they don't get the complaints. People have problems like yours and they don't know why. On a hot humid day, your AC should run continuously. If it doesn't it is oversized.

  4. #4
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    Default Re: how seal floor boots

    Quote Originally Posted by RJordan View Post
    Verify whether the crawl space is the problem. If it is, fix that.

    You may have an oversized air conditioner. Oversized air conditioners put out a lot of cold air, but don't run long enough to take the humidity out of the air. They make the rooms cold and create cold surfaces for the moisture to condense on. Oversizing is a common problem. AC contractors don't want to undersize because they will get complaints that the AC system doesn't cool the house. Oversize and they don't get the complaints. People have problems like yours and they don't know why. On a hot humid day, your AC should run continuously. If it doesn't it is oversized.

    An A/C during the summer should not run continuously, if it does it's undersized. It should work the same way your heat does, gets the room to temp and shuts off till it's needed again.

  5. #5
    Join Date
    Jul 2009
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    Northeast
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    Default Re: how seal floor boots

    Quote Originally Posted by RJordan View Post
    Verify whether the crawl space is the problem. If it is, fix that.

    You may have an oversized air conditioner. Oversized air conditioners put out a lot of cold air, but don't run long enough to take the humidity out of the air. They make the rooms cold and create cold surfaces for the moisture to condense on. Oversizing is a common problem. AC contractors don't want to undersize because they will get complaints that the AC system doesn't cool the house. Oversize and they don't get the complaints. People have problems like yours and they don't know why. On a hot humid day, your AC should run continuously. If it doesn't it is oversized.
    Your A/C should not run continuously, if it does it's undersized. I should work as your heater does, get the room to temp and shut off till it's needed again.

  6. #6
    Join Date
    Feb 2010
    Location
    Eastern MA
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    75

    Default Re: how seal floor boots

    Sten is right. It should work the same as the heating system.

    However,on the coldest day of the year the heating system should run continuously also.

    Heating systems and cooling systems that only run part of the time on the hottest day of the yaer or the coldest day are seriously oversized on more moderate days.


    Oversized systems are inefficient and cause discomfort. Equipment is designed to run for extended periods. Stopping and starting, as oversized equipment does, shortens their life. Oversized heating equipment puts out a blast of hot air, satisfies the thermostat, and shuts off, repeating the cycle over and over. Hot, cold, hot, cold. Properly sized equipment puts out a more uniform heat and is more comfortable. As I said in the earlier post, oversized cooling equipment does not dehumidify the air sufficiently as there is not enough flow over the coil to remove the humidity. This is a major cuase of mold in the South.

    Building codes call for a manual J calculation and manual J calls for matching the equipment to the load.

    Sorry.

  7. #7
    Join Date
    Feb 2010
    Location
    Eastern MA
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    75

    Default Re: how seal floor boots

    I strongly disagree with jkirk and gizmo on the desireability of venting crawlspaces. The simple fact is that they are cooler than the outside and humid summer air will condense on the wood and cause rot.

    I investigated a house here in Massachusetts several years ago where there was a vented crawlspace and the floor had rotted out a few years after the addition was built.

    You need to treat the crawl space like a basement and keep it dry. The ground has to be covered with poly at a minimum.

    Google crawl spaces on this. There is a lot of research about how to treat crawl spaces.

  8. #8
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    Northeast
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    Default Re: how seal floor boots

    Quote Originally Posted by RJordan View Post
    Sten is right. It should work the same as the heating system.

    However,on the coldest day of the year the heating system should run continuously also.

    Heating systems and cooling systems that only run part of the time on the hottest day of the yaer or the coldest day are seriously oversized on more moderate days.


    Oversized systems are inefficient and cause discomfort. Equipment is designed to run for extended periods. Stopping and starting, as oversized equipment does, shortens their life. Oversized heating equipment puts out a blast of hot air, satisfies the thermostat, and shuts off, repeating the cycle over and over. Hot, cold, hot, cold. Properly sized equipment puts out a more uniform heat and is more comfortable. As I said in the earlier post, oversized cooling equipment does not dehumidify the air sufficiently as there is not enough flow over the coil to remove the humidity. This is a major cuase of mold in the South.

    Building codes call for a manual J calculation and manual J calls for matching the equipment to the load.

    Sorry.


    As usual this topic can be beat to death with different opinions, unfortunately opinions aren't what matters here. Bottom line, a home gets sized per manual j and if it has been done correctly the Heating or Cooling Equipment will shut off when the desired comfort zone has been met. Do you think that Heating systems in homes in Alaska run for months at a time. I think not.
    Sorry

  9. #9
    Join Date
    Feb 2010
    Location
    Eastern MA
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    75

    Default Re: how seal floor boots

    Heating equipment and cooling equipment, whether properly sized or undersized, will shut off when the thermostat is satisfied.

    You can put a Nascar engine in a Volkswagen and not exceed the speed limit by taking your foot off the accelerator.

    You can put a furnace that will heat a supermarket in a house and it will. It will turnoff at whatever the thermostat is set at. Doesn't mean the house will be comfortable or good for the equipment.

    Manual J says to design for the conditions that happen 99% of the time. If exactly designed, 1% of the time the heating equipment would be undersized. This isn't opinion. This is accepted engineering practice and required by the building code.

    What is opinion (or maybe fear is the better word) by heating contractors is that Manual J will undersize the equipment. So the assumptions they put into Manual J will oversize equipment. A perfectly sized piece of equipment will be slightly undersized on the coldest day of the year, when sized by Manual J. In reality, the heating contractor will most likely end up oversizing because he won't be able to find a furnace of the exact capacity determined by Manual J.

    There are a lot of other factors that affect the functioning and efficiency of the heating system. Like the ductwork and the tightness and insulation in the building. The new energy code will make this more predictable and enable heating contractors to size equipment correctly.

    This has turned the original post upside down. Sorry. I live in a heating climate and think more about heating than cooling. The priciples are the same in the South, but reversed.

  10. #10
    Join Date
    Aug 2007
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    The Great White North
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    4,045

    Default Re: how seal floor boots

    Not to beat this topic to death --- but --- for the most part I'm siding with RJordan on both topics of the crawl space and HVAC.


    I live in a heating climate and think more about heating than cooling.
    Ditto that ------ when the temps dip down to 40 below well it's more of survial than just being comfy.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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