Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 25-11-2017, 09:39   #1
Registered User

Join Date: Aug 2016
Posts: 176
advice - replace balsa core with ?????

My deck is soggy since water got in it.

It is balsa cored.

I want to replace with foam core of some sort.

What do people recommend ?

arch
arch007 is offline   Reply With Quote
Old 25-11-2017, 09:47   #2
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,276
Re: advice - replace balsa core with ?????

Don't know if there are new and better options for foam cores but back in the olden days when foam cores were first used they were found to also have serious but different problems.

With the original foam cores the foam could break down over time, especially in areas of high loads so you ended up with more or less the same problem as you have with balsa, just a different cause. Maybe some who are more experienced with foams may comment on new versions that could be better.

That being said, I have a 30 year old boat with foam cored decks. The only problems were areas where leaks developed, otherwise the core is great. I would tend to go with balsa again BUT keep the water out. Very doable and very reliable by proper mounting and bedding of stanchions, deck hardware and any other place you penetrate the glass layer.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
skipmac is offline   Reply With Quote
Old 25-11-2017, 11:45   #3
Moderator
 
Adelie's Avatar

Join Date: Feb 2010
Location: La Ciudad de la Misión Didacus de Alcalá en Alta California, Virreinato de Nueva España
Boat: Cal 20
Posts: 17,188
Re: advice - replace balsa core with ?????

End grain balsa is what I’d use.
__________________
Num Me Vexo?
For all of your celestial navigation questions: http: fer3.com
A house is but a boat so poorly built and so firmly run aground no one would think to try and refloat it.
Adelie is offline   Reply With Quote
Old 25-11-2017, 12:03   #4
Marine Service Provider

Join Date: Jan 2008
Location: Cape Town, South Africa
Boat: Miura 31
Posts: 348
Re: advice - replace balsa core with ?????

Watch the YT videos of the replacing of Athena's deck from around this video https://youtu.be/Y7lC6KNWr1c
JohnT is offline   Reply With Quote
Old 25-11-2017, 12:19   #5
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,276
CORRECTION!!

Sorry. Just noticed I said my 30 year old boat is foam cored. That is a mistake. Decks and hull are all balsa core.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
skipmac is offline   Reply With Quote
Old 25-11-2017, 13:04   #6
Registered User
 
Suijin's Avatar

Join Date: Feb 2013
Location: Bumping around the Caribbean
Boat: Valiant 40
Posts: 4,626
Re: advice - replace balsa core with ?????

Divinycell. Some complain that it's expensive, but in the grand scheme of a recoring project it's cheap.
Suijin is offline   Reply With Quote
Old 25-11-2017, 13:30   #7
Registered User

Join Date: Oct 2015
Posts: 2,007
Re: advice - replace balsa core with ?????

Quote:
Originally Posted by arch007 View Post
My deck is soggy since water got in it.

It is balsa cored.

I want to replace with foam core of some sort.

What do people recommend ?

arch
Doesn't matter one bit if you use balsa or foam--if you don't fix the leaks that caused the problem, it will be back. Foam might last a bit longer wet, but certainly not forever.

If you (really) fix the leaks, balsa core will last as long as the boat.
billknny is offline   Reply With Quote
Old 25-11-2017, 14:18   #8
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 4,861
Re: advice - replace balsa core with ?????

How old's the boat and how long to you intend to keep it? No use repairing it so it will last forever if you don't intend to keep it that long. As has been mentioned ^^, better to spend additional time and effort fixing leaks. Especially check the oft overlooked hull to deck joint.
Reefmagnet is online now   Reply With Quote
Old 25-11-2017, 14:33   #9
Marine Service Provider
 
Moosemiester's Avatar

Join Date: Sep 2009
Location: Michigan
Boat: CHB/MT D/C Trawler, 34'
Posts: 79
Re: advice - replace balsa core with ?????

Marine Plywood is cheap relative to balsa or foam, easily found, and easy to work with.

Like other posters have already said fix the leaks first...
Moosemiester is offline   Reply With Quote
Old 25-11-2017, 16:09   #10
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 8,762
Re: advice - replace balsa core with ?????

Quote:
Originally Posted by Moosemiester View Post
Marine Plywood is cheap relative to balsa or foam, easily found, and easy to work with.

Like other posters have already said fix the leaks first...
  • Heavy.
  • Wicks water faster (not end grain).
  • Rots faster.
__________________
Gear Testing--Engineering--Sailing
https://sail-delmarva.blogspot.com/
thinwater is offline   Reply With Quote
Old 25-11-2017, 17:51   #11
Registered User

Join Date: Apr 2017
Location: Queensland Oz
Posts: 259
Re: advice - replace balsa core with ?????

When based in Rabaul New Guinea I bought a very decrepit fireball dinghy to race with the local sailing/yacht club. The deck was a foam core fiberglass structure, & much of the foam had disintegrated, leaving 2 skins of about 3 Oz fiberglass, with little between them, not strong enough to sit on.


After drilling some large holes, & getting as much of the old foam out, & blowing out with compressed air, I used mix & pour polyurethane foam to replace the old.


This stuff applies considerable force when expanding after pouring, so I had to support each section with plywood clamped above & below while foaming.


It was only an old sailing dinghy, but I then raced it a couple of times a month, & loaned it for club use when I was out of town. It was still going strong a couple of years later when I left the area.
Hasbeen is offline   Reply With Quote
Old 26-11-2017, 09:43   #12
Registered User

Join Date: Jan 2011
Location: Holland, Michigan
Boat: Catalina 30
Posts: 193
Re: advice - replace balsa core with ?????

My 2 cents: use marine plywood, but before you install it, soak it with penetrating epoxy, especially on the ends. I would cut all pieces to size, get them ready to install, then apply a liberal amount of penetrating epoxy all around. You will end up with something that is incredibly stiff and will last as long as the boat, if not longer. Love the stuff!
carlheintz is offline   Reply With Quote
Old 26-11-2017, 10:01   #13
Registered User

Join Date: Feb 2016
Location: Vilamoura - Portugal
Posts: 27
Re: advice - replace balsa core with ?????

Divinicel.
dietervoegeli is offline   Reply With Quote
Old 26-11-2017, 11:54   #14
Registered User

Join Date: Jun 2008
Location: NZ
Posts: 66
Send a message via Skype™ to DerekKelsall
Re: advice - replace balsa core with ?????

Quote:
Originally Posted by arch007 View Post
My deck is soggy since water got in it.

It is balsa cored.

I want to replace with foam core of some sort.

What do people recommend ?

arch
I am amazed at the number of boaties who are unaware of the fact that cross linked PVC, Airex and Corecell do not rot or take up water. 70-80 Kg density will do most jobs. Use with polyester or vinylester. Epoxy works but beware the toxicity - do not breath the fumes or dust and do not get it on your skin. I have recently been in touch with the new owner of tri Trifle, which i built in 1967. Still sailing, still sound and I have dozens of other incidents. PU foam is another kettle of fish - a few boats were built using low density PU and gave foam a bad name. Boats built to my spec will almost certainly be free of structural issues going back to 1965 and all kinds up to 100ft. GB 11, 78ft., Alan Gurney design, I built - first to finish in the first Whitbread Round the World. Still sailing and probably the most travelled yacht of all time. PVC foam, unidirectional E-Glass and polyester resin.

Happy boating,

Derek.
DerekKelsall is offline   Reply With Quote
Old 26-11-2017, 14:51   #15
Registered User
 
Aaarrgh's Avatar

Join Date: Nov 2015
Location: Western KY - US
Boat: 1984 Merit 25
Posts: 121
Re: advice - replace balsa core with ?????

Quote:
Originally Posted by carlheintz View Post
My 2 cents: use marine plywood, but before you install it, soak it with penetrating epoxy, especially on the ends. I would cut all pieces to size, get them ready to install, then apply a liberal amount of penetrating epoxy all around. You will end up with something that is incredibly stiff and will last as long as the boat, if not longer. Love the stuff!
Could you please offer a preferred source for the penetrating epoxy that you recommend, and maybe a preferred brand name?

Thankfully,
Aarrrgh!
Aaarrgh is offline   Reply With Quote
Reply

Tags
core

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Balsa vs Foam Core PyotrBee Multihull Sailboats 20 28-08-2009 20:12
To balsa core or not to balsa core? fbchristo Multihull Sailboats 135 04-02-2009 15:13
different core types (foam pvc, divinicell vs balsa) schoonerdog Multihull Sailboats 56 22-07-2008 09:56

Advertise Here


All times are GMT -7. The time now is 15:10.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.