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Old 13 August 2010, 09:01   #1
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Dory Wet Foam Issue

hi guys,
i have a 17ft Dory, with foam under the deck, about 15inches thick in the middle
it has got wet where it was moored for months without covering, previous owner!
apart from this its a lovely boat so is it worth removing the foam? i know it does often ends up waterlogged, thus making the boat heavier

just wondered if any have done this, and if they replaced it with new foam, or just left it with bilge pumps and so on.

does it affect the stability of the boat to remove it?

any advice/thoughts would be appreciated


thanks
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Old 13 August 2010, 09:37   #2
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yes i have seen it dozens of times when scrapping boats,and yes it can have a large weight increase with waterlogged foam ,,on one of my hard boats the seat/bouyancy tanks were soaking wet ,,so i removed the old foam and replaced with some closed cell2 pack stuff,,when removing the old foam i could hardly pick it up it was that full of water ,,suppose there is various ways water can find its way in over the years ,,but whatever you do i would replace the foam with something similar as with some boats its not just a bouyancy issue as giving stiffness ridgidity to the boat and sound dampning .
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Old 13 August 2010, 10:29   #3
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dory foam

If you have long term access to dry storage it is possible to drill the fibre glass hull in a number of places above the waterline turn it upside down and let it drain. Once its stopped draining, no weeps and a reduced wieght, simply prepare, fill and gell coat the drilled holes to make good repair. also while it is out the water check it over to see where the water is gaining entry.

Draining takes months rather than days.

The foam makes the hull rigid because the inner and outer skins are held in opposite tensions.
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Old 14 August 2010, 16:34   #4
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so sorry to appear thick, but the foam i am talking about is between the deck, and the hull, is there foam beween what i can see as the hull, from inside the boat, and the outer hull?

i cut a hatch in the deck, and cut a circular hole down through the foam until i got to the hull.
i am presuming that is the inner hull, and there is an outer one too.

if this is the case, when i take out the drain bolts in the back of the boat, very little water comes out.

i am wanting to sort out the foam just under the deck. would it be best to just let it dry for some months, then rubberize the deck to waterproof it?
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Old 14 August 2010, 17:15   #5
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I believe the entire void between the deck and the outer hull is filled with foam. When you take the bung out and there is just a trickle this is because there is a giant sponge under the deck holding all the water, my experience is once it gets wet its virtually impossible to get dry.
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Old 14 August 2010, 17:20   #6
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A water logged dory is pretty much a skip shaped log.
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Old 14 August 2010, 17:22   #7
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A water logged dory is pretty much a skip shaped log.
nah - at least you can burn a log
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Old 14 August 2010, 17:26   #8
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i have been using it for about 9 months, and it is slowly drying out, at first, when i cut the hole in the deck, it was always full of water, now it has about 2" in the bottom when i look.

so it is slowly improving.

also, i have a good cover for her, so she does not get wet when left in the pound.

i take the bilge screws out every time i have used her, and leave them out until next time.
when i remove them, about a pint of water comes out, so not much.

perhaps i need to be patient and wait, and with my cover and removing the screws, she may be ok.

i keep meaning to take her to the weighbridge, to see what she weighs, then in a few months, i could see how she is doing on her diet!
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Old 14 August 2010, 17:30   #9
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i take the bilge screws out every time i have used her, and leave them out until next time.
when i remove them, about a pint of water comes out, so not much.
when I take mine out nothing comes out. theres no foam in my void to soak it up either.
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Old 14 August 2010, 17:34   #10
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so have you removed the foam?
i hear if you do, you must replace it?

i just presumed the water that comes out is what splashes into the boat as you go along, the boat has no cuddy, and it does get wet as we use it for diving.
there must be small holes from the deck that it goes through??
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