Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 27-07-2010, 13:00   #1
Registered User
 
Craig McIlrath's Avatar

Join Date: Jul 2010
Location: South Africa- KZN
Boat: Samson C Duece 45' (Shumbu)
Posts: 6
Ferro Cement Weeping Spots ?

Hi guys- and gals-

Some advice? Are weeping spots something to be concerned about? Red/ rusty in colour. Appears to be a slight bubble under the paint that pops easily and leaks a few drops of moisture. I have been told to chip/ grind down and apoxy.

Should I be concerned?

Cheers,
Craig
__________________

__________________
Craig McIlrath
A Dream come true
Craig McIlrath is offline   Reply With Quote
Old 27-07-2010, 16:30   #2
Registered User
 
smallyachts's Avatar

Join Date: Apr 2007
Location: Land O Lakes, FL
Boat: Samson C Ranger - "Tin Cup" & Samson C-Farer - "Sam McGee"
Posts: 159
The recommendation is a good start, but more importantly where is the moisture coming in from.

If you fix the cosmetic issue, it will undoubtedly come back if you do not stop the moisture from coming in to start with.

Is it in the area of the chain locker?

Is it close to the screed material in the sheer or bulwark of the hull?

Both areas are common locations for rust blisters on ferro-cement hulls.

Water migrates in a downward direction (above the waterline ) so you should be able to see if you can identify where the moisture is coming from in a line directly above the rust weep.

A very common failure point in keeping moisture out of the hull work is underneath the cap rails if you have them.

Amazingly, most designs that I am familiar with use some type of angle iron or flat plate to develop the screed line. The very thin layer of cement ( 1/8" to 1/4") eventually allows moisture to hit the iron below it.

Especially if the builders were not cautious and used insufficient bedding material around all the bolts, or if the cap rail material was not sealed. I have traced rust blisters up to a couple of feet away due to this type of a failure on a number of hulls.
__________________

__________________
SmallYachts
Sailors, Adventurers & Friends
Our hulls aren't afraid of things that go "bump" in the night!
smallyachts is offline   Reply With Quote
Old 06-03-2011, 18:36   #3
Registered User

Join Date: Nov 2009
Location: New Zealand
Boat: John Norris C-Breeze 50'
Posts: 18
Send a message via Skype™ to britskip
Re: Ferro Cement Weeping Spots ?

I have a Samson C-Breeze, bought in May last year and still in refit. I had blisters on hull, peeled off a pretty crappy paint job to reveal the bare hull,spotted round marks on hull that seemed to be coming off, hit with hammer, piece broke away revealing metal basket and crunbling hull. Clean out hole, plenty of quality rust proofing liquid and wash off. fill with epoxy cement, or epoxy glue. be careful, one could be many. I traced my blisters to some previous damage around gunwhales where water was seeping in.
__________________
britskip is offline   Reply With Quote
Old 06-03-2011, 19:32   #4
Now on the Dark Side: Stink Potter.
 
CSY Man's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Location: Ft. Lauderdale
Boat: 2001 Albin 28TE.
Posts: 3,398
Images: 115
Re: Ferro Cement Weeping Spots ?

Quote:
Are weeping spots something to be concerned about? Red/ rusty in colour. Appears to be a slight bubble under the paint
Yup:

Big problems coming yer way:

The chicken wire embedded in the cement is rusting and therefore expanding, then cracking the concrete.

The brittle result can be seen here:

__________________
Life is sexually transmitted
www.odincharters.com
www.susanhanssen.com
CSY Man is offline   Reply With Quote
Old 07-03-2011, 14:41   #5
Registered User

Join Date: Nov 2009
Location: New Zealand
Boat: John Norris C-Breeze 50'
Posts: 18
Send a message via Skype™ to britskip
Re: Ferro Cement Weeping Spots ?

yeah, mine came as a result of a poorly laid towing hawser by previous owner. site looks just same, repair is extensive and the only cure. have it done properly. at least its notn osmosis!!!
__________________
britskip is offline   Reply With Quote
Old 04-03-2013, 17:33   #6
Registered User

Join Date: Nov 2009
Location: New Zealand
Boat: John Norris C-Breeze 50'
Posts: 18
Send a message via Skype™ to britskip
Re: Ferro Cement Weeping Spots ?

after removing ALL epoxy covering, redoing the whole hull smoothing, fairing and painting, 1 year later blisters start coming back. soooo annoying. Anyway, advice is to grind off the iron capping rail (see small yachts above) al way around gunwhales and pour in runny cement to fill right down deep inside. Maybe fibreglass over top then.
__________________
britskip is offline   Reply With Quote
Old 05-11-2015, 14:23   #7
Registered User

Join Date: Nov 2009
Location: New Zealand
Boat: John Norris C-Breeze 50'
Posts: 18
Send a message via Skype™ to britskip
Re: Ferro Cement Weeping Spots ?

Hi, I bought a Samson C-Breeze about five years ago, still 'doing it up' after being misled by Gulf marina brokers in New Zealand. I completely stripped down the hull to the concrete, fixed anything that needed fixing, and re-epoxied it all. Just back from the bow was some bubbling under the paint work. After the strip down this proved to be some crumbling cement, and these little sunken spots, resembling sink holes in a limestone area. A neighbour with a vast experience of ferro-c boats told me to crash them with a hammer, get rid of all the loose stuff back to the steel mesh, treat with rust preventer and then refill with pre-mix epoxy cement mix. Great, unfortunately they came back, not as many but still there. Neighbour reminded me that he had told me to remove the steel capping put on top of the bulwarks. It had been exposed in places and started to rust. I used a grinder, removed the steel 1/4 " steel strip then used a very, very watery cement mic pouring it in to seep down through all and any space in the hull. After drying, fair off with some epoxy and cover with fibreglass sheet. Hopefully you will see some improvements.
__________________
britskip is offline   Reply With Quote
Old 24-12-2015, 09:50   #8
Registered User

Join Date: Dec 2011
Location: Edmonds, WA
Boat: 19T Gaff Cutter
Posts: 87
Re: Ferro Cement Weeping Spots ?

I've a Sampson C-Farer , and was battling an ongoing rust bleed coming from under caprail . When boat was hauled two years ago bit the bullet and used a needle scaler
(Small air hammer) and grinder to remove the steel 1/4 inch flat bar under the caprail . Then used rust converter ( painted on ) then sikadur 32 as a bonding agent then filled the void with sikatop 1-2-3 . After a couple seasons the repair is perfect !
It is a very easily achieved repair for the amateur . Love my Ferroboat !
Cheers Stonefloat


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
Stonefloat is offline   Reply With Quote
Reply

Tags
ferro

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ferro Cement Hulls ? marleman Monohull Sailboats 1064 06-12-2017 17:11
ferro cement ? need advice bigwhyte Monohull Sailboats 52 12-05-2013 19:52
SSB Ground for Ferro-Cement Boats Yachts66 Marine Electronics 1 15-06-2010 09:07
Ferro-Cement Paint Removal Mike.P Construction, Maintenance & Refit 3 12-05-2010 22:26
Ferro Cement Hull ID mudnut Monohull Sailboats 3 31-01-2010 11:24



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:27.


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.