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  1. #1
    Petty Officer 3rd Class
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    Default Keeping condensation out from under the cover

    I'm getting close to putting my boat cover on for the winter and I'm concerned with condensation. I have a nice cover and keeps water out but even if I put the cover on a completely dry boat at 6PM in the middle of the summer, the entire cover will be covered in condensation on the top and bottom by 10PM. It's not a huge deal when you use it every few days in the hot summer sun but a big deal if I'm letting it sit for months.

    Has anyone figured out a way to keep the condensation down? Heaters are out of the question since it's a inboard boat.

  2. #2
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    Default Re: Keeping condensation out from under the cover

    you could try placing a few cans of damp rid under there. you can pick it up from home depot relatively cheap.

  3. #3
    Commander RogersJetboat454's Avatar
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    Default Re: Keeping condensation out from under the cover

    With out a heater, I would use several desiccant bags/cups.

    People use them in semi damp finished basements. Should be available at any big box home improvement store or maybe even wally world.

    Heres a link to some on Amazon;
    http://www.amazon.com/DampRid-FG60-R...405652&sr=8-34
    1976 Rogers Custom Boats 18' "Bonneville" W/ Chevy 454/ Berkeley 12JC

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  4. #4
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    Default Re: Keeping condensation out from under the cover

    Or a box fan.

    Desicants often work until they have absorbed all they are going to absorb. Without being dryed artificially or naturally, they stop doing their thing.

    If you have a spot on the boat that is always the first to be wet from condensation, you might be able to use a water leak detector to turn the fan on.

  5. #5
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    Default Re: Keeping condensation out from under the cover

    hang a 3" black pipe or hose over the gunnel under the cover. put it on the side that gets the most sun. hang a white pipe or hose over the gunnel on the shadiest side or end . The sun will heat the black pipe more than the white pipe ,causing it to draw the air from outside through the boat and out the black pipe. With the circulation happening,you will keep inside dry.

  6. #6
    Lieutenant woosterken's Avatar
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    Default Re: Keeping condensation out from under the cover

    check this out..........

    http://www.bilgewizard.com/

    i have one and it works great , and it is even solar powered

    woosterken
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  7. #7
    Lieutenant Commander veritas honus's Avatar
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by Lone Duck View Post
    hang a 3" black pipe or hose over the gunnel under the cover. put it on the side that gets the most sun. hang a white pipe or hose over the gunnel on the shadiest side or end . The sun will heat the black pipe more than the white pipe ,causing it to draw the air from outside through the boat and out the black pipe. With the circulation happening,you will keep inside dry.
    THAT is freaking ingenious!!! Makes perfect sense. Do you do this yourself? If so, how well does it work? I'd imagine, very well.
    Safe and happy boating always!!!,

    Veritas Honus
    1992 Chaparral 2050 SLC: 205HP 4.3L Yamaha I/O
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  8. #8
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by veritas honus View Post
    THAT is freaking ingenious!!! Makes perfect sense. Do you do this yourself? If so, how well does it work? I'd imagine, very well.
    Yup! my granddad built a root cellar that way white pipe on the floor and black pipe on the roof. He dug a ditch 5'deep and 20' long( by hand) and ran white pipe in on the floor. cellar was 12 x 12 and vegetables kept well . I was 10 at the time and never forgot it. Dug the cellar in the side of a hill .

  9. #9
    Lieutenant Commander 26aftcab454's Avatar
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    Default Re: Keeping condensation out from under the cover

    ventlation
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  10. #10
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by woosterken View Post
    check this out..........

    http://www.bilgewizard.com/

    i have one and it works great , and it is even solar powered

    woosterken
    Is your running all day long everyday there is sun?
    86 Dixie Super Skier 299 Restoration: http://forums.iboats.com/showthread.php?t=444223

  11. #11
    Lieutenant Commander veritas honus's Avatar
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by Lone Duck View Post
    Yup! my granddad built a root cellar that way white pipe on the floor and black pipe on the roof. He dug a ditch 5'deep and 20' long( by hand) and ran white pipe in on the floor. cellar was 12 x 12 and vegetables kept well . I was 10 at the time and never forgot it. Dug the cellar in the side of a hill .
    Now THAT'S some "Good Ol' Yankee Know-How". That's AWSOME!!! Thank you for sharing the info... And, the memories.


    Safe and happy boating always!!!
    Safe and happy boating always!!!,

    Veritas Honus
    1992 Chaparral 2050 SLC: 205HP 4.3L Yamaha I/O
    ShoreLand'r tandem axle trailer
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    Fear is only a state of mind. Gravity is a fact of life...
    No fall, however high, ever hurt anyone... It's that sudden stop at the end...

  12. #12
    Chief Petty Officer jayhanig's Avatar
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by veritas honus View Post
    THAT is freaking ingenious!!! Makes perfect sense. Do you do this yourself? If so, how well does it work? I'd imagine, very well.
    I'm having trouble picturing this. Are we talking about just suspending 6' lengths of open pipe over the gunnels; one black and one white? Or are they connected to create a closed system like a radiator?
    Jay Hanig
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  13. #13
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by jayhanig View Post
    I'm having trouble picturing this. Are we talking about just suspending 6' lengths of open pipe over the gunnels; one black and one white? Or are they connected to create a closed system like a radiator?
    sorry bout that. suspend white pipe over gunnel down to the deck, suspend black pipe just over the gunnel. That will give you good air movement.

  14. #14
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    Default Re: Keeping condensation out from under the cover

    Don't know if this would interest you, but iboats also has a cover support pole with vent built in. I haven't tried it, but noticed it while I was Windows™ shopping.

    http://www.iboats.com/Westland-Vente...--view_id.6109
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  15. #15
    Rear Admiral Fireman431's Avatar
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by Lone Duck View Post
    hang a 3" black pipe or hose over the gunnel under the cover. put it on the side that gets the most sun. hang a white pipe or hose over the gunnel on the shadiest side or end . The sun will heat the black pipe more than the white pipe ,causing it to draw the air from outside through the boat and out the black pipe. With the circulation happening,you will keep inside dry.
    I would love to see a quick drawing of this if you don't mind. I can picture this 2 different ways and I'm not sure which is correct.

    A picture is worth a thou...well, you know.

    Thanks for the idea.
    2001 Carver Voyager 374 'Stick's Competition'

    Something tells me I should be on the water....

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  16. #16
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by Fireman431 View Post
    I would love to see a quick drawing of this if you don't mind. I can picture this 2 different ways and I'm not sure which is correct.

    A picture is worth a thou...well, you know.

    Thanks for the idea.
    Sorry ! I don't belong to any photo buckets or such like. But I will try again. Slip a length of drier vent under the cover on the shadiest end of the boat. make sure one end is down in the lowest part of the boat. The other end is over the gunnel beneath the edge of the tarp. position it so it just shows under the outside edge. Then take a short length of black pipe and lay it over the gunnel under the tarp on the end that gets the most sun. The end under the tarp should just be over the gunnel (making it higher in the boat than the inside end of the white pipe or drier vent) Have the outside end of the black pipe exposed to the sun (about a 1' should do it. Sun heats end of black pipe ( hot air always rises ) pulling air from inside the boat The air moving out of the boat will pull the cooler air through the white pipe into the boat. Can anyone who understands this draw a pic and post it ? the best choice would be to have the white pipe in the stern in the shade and the black pipe high in the bow in the sun. If you can, open the hatch to the bilge also.

  17. #17
    Lieutenant woosterken's Avatar
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    Default Re: Keeping condensation out from under the cover

    JFW,
    yes it dose, even on a partly cloudy day i also have the a/c adapter to run on completlely cloudy days.
    woosterken
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  18. #18
    Rear Admiral Fireman431's Avatar
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by Lone Duck View Post
    Slip a length of drier vent under the cover on the shadiest end of the boat. make sure one end is down in the lowest part of the boat............. If you can, open the hatch to the bilge also.
    Thank you for the response. That was what I was looking for!
    2001 Carver Voyager 374 'Stick's Competition'

    Something tells me I should be on the water....

    If I answer your upholstery questions, it's only because I've been doing it 20+ years...

  19. #19
    Chief Petty Officer jayhanig's Avatar
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by Fireman431 View Post
    Thank you for the response. That was what I was looking for!

    I must just be thick. I can't figure out if he's talking about open pipe, piping tied together to create a closed system or what. Until a picture or diagram pops up, I'm going to admit defeat.
    Jay Hanig
    Topsail Beach, NC USA
    1985 Galaxy 176 Bowrider
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  20. #20
    Vice Admiral LippCJ7's Avatar
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    Default Re: Keeping condensation out from under the cover

    Ok Don't laugh its a bit antiquated but heres my take on it,


    Is this right?
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  21. #21
    Rear Admiral Fireman431's Avatar
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    Default Re: Keeping condensation out from under the cover

    Jay

    I think I have this right, others please correct me if I'm worng.

    When the boat is covered, lift up the tarp on the lowest/least sunny side of the boat. Let's say this is in the port side aft corner. Drop a piece of white hose (think flexible dryer vent hose) into the lowest portion of the boat. If you have a bilge, open that up and allow the vent to fall into there.

    Now, go to the sunniest/highest portion of the boat and lift the tarp. Let's say this is right at the bow, on the nose of the boat. Put in a piece of flexible black hose (think 4" black corrugated drain pipe or bilge vent hose). Leave approximately 1' of this sticking out, so the sun can heat it up.

    When the air in the boat and in the pipe become superheated from the sun, air will flow into the lower/cooler white vent and out the higher, hotter black vent. This is natural air flow as heat rises.

    Personally, I'm interested in trying it. My car sits semi shaded all day so I'm going to try it with that and see if i get and air flow through the pipes.
    2001 Carver Voyager 374 'Stick's Competition'

    Something tells me I should be on the water....

    If I answer your upholstery questions, it's only because I've been doing it 20+ years...

  22. #22
    Rear Admiral Fireman431's Avatar
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    Default Re: Keeping condensation out from under the cover

    Lipp..No Fair! You posted the pic while I was typing that out!

    I think your air flow is backwards, though. Maybe I'm wrong?!?
    2001 Carver Voyager 374 'Stick's Competition'

    Something tells me I should be on the water....

    If I answer your upholstery questions, it's only because I've been doing it 20+ years...

  23. #23
    Vice Admiral LippCJ7's Avatar
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    Default Re: Keeping condensation out from under the cover

    LOL I Know but it was the least I could do for the poo under the finger nails crack!!! Its actually a cool idea I had never thought of, it wont work for me as my boats in the shade so I am leaning towards the bilge fan idea but still a cool idea, I think you could eliminate the white/dryer hose though, I'm not sure how much pressure will build with the black pipe but its something to play with!
    2000 Crownline 248 BR
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  24. #24
    Lieutenant Commander veritas honus's Avatar
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by LippCJ7 View Post
    LOL I Know but it was the least I could do for the poo under the finger nails crack!!! Its actually a cool idea I had never thought of, it wont work for me as my boats in the shade so I am leaning towards the bilge fan idea but still a cool idea, I think you could eliminate the white/dryer hose though, I'm not sure how much pressure will build with the black pipe but its something to play with!
    Would you rather be on a black tar roof in the hot sun, or a white or silver roof? Ever been there? If not, put a piece of white tarp, house wrap, or plastic on a black rooftop in the sun for an hour, and then go touch the white material. Now touch the black roof. You'll get a good idea of how well this will work.
    Safe and happy boating always!!!,

    Veritas Honus
    1992 Chaparral 2050 SLC: 205HP 4.3L Yamaha I/O
    ShoreLand'r tandem axle trailer
    T/V: 2001 Dodge Ram 1500Sport 5.9L 4X4 Off Road Package Dana 410 rear

    Fear is only a state of mind. Gravity is a fact of life...
    No fall, however high, ever hurt anyone... It's that sudden stop at the end...

  25. #25
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    Default Re: Keeping condensation out from under the cover

    Quote Originally Posted by LippCJ7 View Post
    Ok Don't laugh its a bit antiquated but heres my take on it,


    Is this right?
    Yup that is it! The only difference is that the air is pulled from outside through the white hose and out the black hose. Keep the white hose over the gunnel just past the edge of the cover on the out side. The black pipe can be a straight length of ABS or painted steel , aluminum etc: as long as it is black. The hotter that pipe gets the better the circulation.

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