Bayliner Capri new foam dilemma

petermarcus

Petty Officer 2nd Class
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Apr 30, 2010
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132
So, it's raining sideways, which means no boat work right now, and I'm plotting the future a bit.

I have a '94 19' Bayliner Capri 1950, the deck is gone and the stringers are next. As the rain pours, I can see that it's just collecting in the below-deck space, outside the stringers. I had wet foam there, too.

I've been doing the foam debate for a couple weeks now. No foam, pourable foam, noodles, HD foam, etc.

I've seen where Oops says that Capris typically need pourable foam to support the hull (or adding a later of 1708 up the whole hull) and I've seen others mention drumming sounds if the foam isn't there. However, I don't want a situation where water can collect on the outboard side of the stringers again, no matter how well I glass the deck and stringers and transom.

So, I'm considering making drain holes in the stringers so the below-deck sections can drain into the bilge, but that opens another problem if the bilge ever gets full enough of water that it goes up the drain holes and wets the foam. I've even considered 3/4" PVC pipes running up the low-points of the below-deck sections, with small holes drilled in, so water can be channeled out. But, again, if the bilge temporarily gets more water in it than I can pump out, I've just shot water up the PVC pipes into the foam.

I guess I'm debating these options. Leaving aside floatability, and just concentrating on structural support:

* Pourable foam, but seal off the below-decks as watertight as possible. (Problem is, if I miss a spot and water gets in, it'll never get out).
* Pourable foam, but either drain holes through the stringers into the bilge or a PVC pipe system for drainage.
* Reinforce the hull with 1708 (weight...sigh) and either ignore the foam, or do something more water-forgiving like HD foam or noodles, and cut drain holes through the stringers into the bilge.
* Reinforce the hull with 1708, and keep everything empty vowing to never have anything to do with foam again.

Just how waterlogged will 2-part pourable foam get? If I drill holes through the stringers and a rogue wave dumps a couple feet of water in the bilge and gets the foam wet through the drain holes, will it drain out? I know 90+% of it is closed cell, but the foam I took out was pretty wet, though there wasn't any place for the water to drain out to.
 

lowvlot

Petty Officer 1st Class
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Jul 5, 2009
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Re: Bayliner Capri new foam dilemma

I am having the debate/dilema about foam. I have already drilled a hole from the sealed side of under the deck into the bilge area for drainage. Originaly thought that I would not replace the foam at all. Now am thinking I want to and am concerned that it will absorb water again. Sorry I have no advice for you as I am in the same (boat).
 

Friscoboater

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Jul 3, 2009
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Re: Bayliner Capri new foam dilemma

My boat did not have foam under the deck at all. The all under the gunwhales and two HUGE blocks in the back. I replaced them.
 

DennisM

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Jul 6, 2010
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Re: Bayliner Capri new foam dilemma

No idea if this is feesable on a boat, but just throwing it out there just in case.

What about wrapping the foam, (if you use something that is non-pourable) in a plastic? Think like shrink wrap or space bags?

If doing pourable you could make a mold pour the foam, and then wrap the whole pre-cast and place in opening/cavity

Be extra careful not to tear the plastic when installing either foam or deck.
 

petermarcus

Petty Officer 2nd Class
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Apr 30, 2010
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132
Re: Bayliner Capri new foam dilemma

lowvlot -- yeah, fun dilemma. Every time I think I've made a decision one way or another, and I read something on the forums here and change my mind :)

frisco -- I was initially considering that. Keeping the whole under-deck empty with drain holes, then loading up on foam under the gunwales, in blocks by the engine, up in the bow by the anchor box, and in the new seats. Then I heard this structural support (and noise) thing, and I'm wondering.

Dennis -- I was thinking of something like that, too, but the pourable foam actually sticks to the stringers and hull, which helps with the support. Firms things up.

-----------------------------

The other thing that really gets me is that it's not a whole lot of space/foam below decks. My gas tank is there in the middle, then the ski locker area, so I'm really looking at two strips about 10-12" wide, by about 15' or so:
foam.jpg

(Mad MSPaint Skillz!)

I can see how this would make the hull a bit more rigid, doing a stringer-like support kind of thing, but I can't see how it would make that much difference if most of the keel area and centerline of the hull is just open anyway.
 

lowvlot

Petty Officer 1st Class
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Jul 5, 2009
Messages
231
Re: Bayliner Capri new foam dilemma

The other thing that really gets me is that it's not a whole lot of space/foam below decks. My gas tank is there in the middle, then the ski locker area, so I'm really looking at two strips about 10-12" wide, by about 15' or so:
foam.jpg

(Mad MSPaint Skillz!)

I can see how this would make the hull a bit more rigid, doing a stringer-like support kind of thing, but I can't see how it would make that much difference if most of the keel area and centerline of the hull is just open anyway.

I could not agree more with this statement. That looks just like my same configureation except I have a cuddy. There was never any foam up under the cuddy cushions and obviously no deck in the cuddy (under the cushions is all storage) I can't see how 12" x about 12' of foam is going to stiffen it up that much.
 

Patriot70$$$

Recruit
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Apr 6, 2009
Messages
5
Re: Bayliner Capri new foam dilemma

im in the same dilemma i have an 18' capri at my shop im located in palm bay the guy whos going to do the floor says he doesnt use foam another guy who works at discount marine says to put it in or green foam board that u buy at lowes its coast guard approved for flotation just pack tight.
 

Patriot70$$$

Recruit
Joined
Apr 6, 2009
Messages
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Re: Bayliner Capri new foam dilemma

plus dont know if u know this theres a place in rockedgle off of viera blvd florida fiberglass great prices
 

petermarcus

Petty Officer 2nd Class
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Apr 30, 2010
Messages
132
Re: Bayliner Capri new foam dilemma

Yep, I've been to Florida Fiberglass. I ordered a couple gallons of epoxy from US Composites because even ground is next day to us, but then I found that place and I'll be spending local now.

I have no problem with the Home Depot foam for flotation because it'll let water over and under the pieces and I can see how it would drain. The 2-part foam actually attaches itself to the stringers and hull, though (if you've ever tried to take it out, it's annoying how much it does). That attachment/bond is what's supposed to help reinforce the hull -- it doesn't slide around, it makes everything act as one piece. But the attachment also causes it to capture water if water happens to find a niche.
 

petermarcus

Petty Officer 2nd Class
Joined
Apr 30, 2010
Messages
132
Re: Bayliner Capri new foam dilemma

clockwatcher -- ooooh, ice cubes. I didn't think of that, but makes sense to create a channel while the foam sets. Hmmmmm....interesting idea.
 
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