Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-08-2013, 15:38   #1
Registered User

Join Date: Aug 2013
Posts: 99
Images: 1
ferro cement

i am getting ready to haul my ferro cement hulled Ingrid Ketch- it is showing some bubbling under the paint and when the bubbles burst there is a rusty run- - i anticipate having to sand it and treat it - any ideas on what to treat it with ??? ferro cement is a composite you know full of all kinds of goodies - the runs - i am hoping this is superficial - the hull i so thick - but i know it has a metal frame
__________________

__________________
kim r is offline   Reply With Quote
Old 12-08-2013, 15:41   #2
Freelance Delivery Skipper..
 
boatman61's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Jan 2010
Location: UK/Portugal
Posts: 20,188
Images: 2
Send a message via Skype™ to boatman61
pirate Re: ferro cement

Steel rod frame with chicken mesh... sounds like the wires rusting away... biggest problem is water seeping under the toe rail and getting into the internal layup through the voids..
__________________


Born To Be Wild
boatman61 is offline   Reply With Quote
Old 12-08-2013, 18:18   #3
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,314
Re: ferro cement

Not sure but perhaps once you cured the spots, you can cover the whole thing with epoxy (?) "osmosis style".

I would try phosphoric acid, rust lock, etc. to seal the steel matrix.

b.
__________________
barnakiel is offline   Reply With Quote
Old 12-08-2013, 18:53   #4
Registered User
 
Crimea Cruiser's Avatar

Join Date: Mar 2013
Location: Crimea
Boat: Colin Archer 36', steel
Posts: 358
Re: ferro cement

Pretty sure it is equivalent to a soaked core on a fiberglass boat. Except the metal mesh and rebar is rusting as opposed to the core on a fiberglass rotting. Either equals a lessening of structural strength levels.

Check this prior thread for some other opinions. Ferro Cement Hull Sailboats ?
__________________
If it floats it's a boat, or perhaps it's f#cal matter!
Crimea Cruiser is offline   Reply With Quote
Old 12-08-2013, 19:01   #5
Registered User
 
DumnMad's Avatar

Join Date: Mar 2012
Location: Nelson NZ; boat in Brisbane
Boat: 45ft Ketch
Posts: 1,245
Re: ferro cement

You could enquire about Aquron. It looks like water, soaks into the concrete and forms a gel inside and prevent chloride attack on the steel. They use it on salt soaked concrete bridges. Not sure how well it would work with less porous 2:1 cement mix.
__________________
DumnMad is offline   Reply With Quote
Old 12-08-2013, 19:02   #6
Registered User
 
Crimea Cruiser's Avatar

Join Date: Mar 2013
Location: Crimea
Boat: Colin Archer 36', steel
Posts: 358
Re: ferro cement

This is the thread I meant to attach. Ferro Cement Hulls ? Sorry. Best of luck with haul and repairs.
__________________
If it floats it's a boat, or perhaps it's f#cal matter!
Crimea Cruiser is offline   Reply With Quote
Old 16-11-2013, 02:18   #7
Registered User
 
BillAU's Avatar

Join Date: Feb 2009
Location: Corio
Boat: Careel 22
Posts: 452
Re: ferro cement

Have a look on this site, they do concrete treatment, I know FC is not concrete but if you contact the site, they may be able to better advise you.
This epoxy site is linked to that first site, this may be a better choice for you,

Good luck with things, remember what Colin Brooks says on FC boats,
Quote from Ferro Cement.Org:

One of the great advantages of a ferroboat hull is....if it was built reasonably well in the first place, almost any damage is repairable.

End Quote

Bill
Australia
__________________
No-one knows but...You could be dead for a long time! So treat others as you would have them treat you! Go out in the world and enjoy your life
BillAU is offline   Reply With Quote
Old 09-12-2013, 02:53   #8
Registered User

Join Date: Dec 2013
Posts: 1
Re: ferro cement - maintanence

I am the owner and slave to a tough girl another Hartley Tahition stretched in the run .
There are many successfully maintained FC yachts out there and a wealth of experience for advice .
It is re commended that concrete degradation and bingles on FC yachts
be either sandblasted and air chiseled to remove damaged material .
Blast will reveal concrete and steel condition . Weld in new bars and wire gal mesh.
Expose repair on both sides of hull .
Thoroughly paint the repair with epoxy resin/ epoxy metal primer to aid adhesion later .
Form up outside of hull repair with light plywood and tom to slip cradle
From the inside pour / trowell a mix of 1/2 Ltr epoxy resin 1/2 Ltr fine cut sand and 1/4 Ltr cement . Adjust viscosity to suit . Do in multiple pours if necessary - really ugly bog .
THIS STUFF IS STICKY AND AFTER CURE VERY HARD
Ramset Epoxy Grout is also good and easy to handle .
Strip form - Grind - Epoxy/Sand bog to low spots - Grind - Voila
Old heads - owners of multiple FC yachts recommend 3 coats of epoxy to the
blasted hull - followed by either a key coat and antifoul or antifoul direct within 24 Hrs of epoxy cure. Same for inside if possible .
Note that FC yachts dont like water on both sides of uncoated hull for any period or reason -electrolysis is also a problem here . Earth anodes and
fittings underwater .
Cheers
__________________
pent4ngle is offline   Reply With Quote
Old 09-12-2013, 18:40   #9
Registered User

Join Date: Mar 2011
Location: Southport CT
Boat: J/36
Posts: 377
Re: ferro cement

The "Rust spots" that you describe bubbling up under the paint make me think of a Beneteau (cast iron keel) I saw that had bubbles on one side of the keel under the paint when it was hauled. Popping the bubbles uncovered a fine dust of red powder that dribbled away as the hull drained off. Electrolysis caused by stray currents from a boat in a neighboring slip (known to have had issues with its electric wiring) apparently pulled the iron out of the keel of their neighbors. If there's iron in your hull matrix (I hope there is!) beware of electrolysis as well as rust.
__________________
psk125 is offline   Reply With Quote
Old 12-12-2013, 11:25   #10
Registered User

Join Date: Feb 2010
Location: NW BC Canada
Boat: Dufour35 1982
Posts: 779
Images: 5
Re: ferro cement

Some great advice positive pent4ngle and from others, what makes this site special at times.
__________________

__________________
www.SouthPacificEngagement.com
NorthPacific is offline   Reply With Quote
Reply

Tags
ferro, men

Thread Tools
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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.