Fisher 1860 foam location

[midtnjk]

Anybody have a link to some blueprints of a 2008 fisher 1860 cc aw build? Am trying to determine if I need to pull the decks and remove foam. It has 4 holes in deck (quarter size) with plugs on back and front deck. When I pull these and push on foam it is completely saturated. I took a screwdriver and chip everything I could from one on the back deck and it went maybe 2-3 inches then I got what feels to be aluminum. Any ideas?

 

[jbcurt00]

No such document exists, likely never did..
Yep, foams toast
Remove/gut hull and rebuild

 

[midtnjk]

May be some stupid questions, but I’ll ask. Is it detrimental if I do nothing? From what I’ve read some remove and replace mainly with pink board from home depot while some put nothing back in. Maybe I’m nieve, but if I drill out rivets and pull decks should be a pretty easy job on this style boat correct?

 

[jbcurt00]

Not familiar w that model.

Problem isn't just that the foam is wet. It's that the foam traps water against the aluminum hull. That water becomes oxygen starved and becomes caustic to the aluminum and eats away at the aluminum, seams, rivets, ribs, stringers & transom.

Take a look at @classiccat rebuild of his Starcraft. 1 of the worst corrosion damage that was well documented, completely rehab'd and splashed

My First StarCraft; 1975 18' SuperSport

Thread Index: Page-1 3/25/2013 to 3/25/2013 Tinny Purchase Mob Introductions Page-2 3/25/2013 to 4/7/2013 Evinrude LU Removal Evinrude LU Leak Revealed Evinrude Compression test (good tester) Evinrude Ignition Upgrades Page-3 4/7/2013 to 4/22/2013 Pulling the Outboard Motor...

forums.iboats.com

Extensive damage

 

[classiccat]

May be some stupid questions, but I’ll ask. Is it detrimental if I do nothing? From what I’ve read some remove and replace mainly with pink board from home depot while some put nothing back in. Maybe I’m nieve, but if I drill out rivets and pull decks should be a pretty easy job on this style boat correct?

it's likely pour-in 2 part foam which would likely be more like an excavation...where we've seen shovels & spades deployed for removal.

Foam removal is a necessary evil in this case; two second what jb said, you don't want waterlogged foam in contact with the aluminum.

 

[midtnjk]

Lol classic cat your description put both a smile and a big worry in my face . Is it safe to assume foam is in center section under actual floor or could it just be in the front and back sections where the plugs are?

 

[classiccat]

Lol classic cat your description put both a smile and a big worry in my face . Is it safe to assume foam is in center section under actual floor or could it just be in the front and back sections where the plugs are?

I'm not familiar with your model of boat however I'd assume every empty cavity under the deck is foam filled to maximize buoyancy in a capsizing &/or swamping event.

 

[midtnjk]

Obviously need to get into first and see, but what keeps the foam from getting wet again? Seems like a false floor would need to be built to keep foam off the bottom of the boat?

 

[classiccat]

Obviously need to get into first and see, but what keeps the foam from getting wet again? Seems like a false floor would need to be built to keep foam off the bottom of the boat?

you want to use a dense closed cell foam that retains very little water; most of us tinny-guys use XPS foam board (not EPS). if you're concerned about solubility in fuel, you can wrap it in hdpe bags...however if you're dumping that much fuel below your deck, you have bigger fish to fry.

 

[midtnjk]

I have seen a lot of people using the 2lb total boat floatation foam (2 part pour type) . Any pro or con to this vs the xps foam board you speak of? I guess my previous question was meant to be worded as isn’t the current saturated foam in the boat closed cell? If so, What prevents this from happening when I replace? Should I be running drainage lines under foam or something of the like?

 

[midtnjk]

Well finally getting around to it. Pulled back deck and definitely wet. Anybody got a good thread on how I should reinstall foam?

 

[midtnjk]