Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-05-2016, 14:35   #1
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Wood Base Plate Rot

I have some through-hulls without true seacocks, but simple stainless ball valves set in bronze for a couple of sink drains as well as a spare unused through-hull in my engine room. These are set on wood plates from their original installation and approximately twenty years old.

I was lubricating and exercising all my seacocks and ball valves today and noticed that my one spare unused ball valve in my engine room had an area of dry rot on a top corner of the wood disk.

By my bottom condition, I'm not planning to hull out for two years. The current amount of rot is not encroaching upon the area of the metal through-hull but I want to stop it's advance. This one with the rot was treated differently as I had covered the wood with a thick white paint when my engine room was empty for repowering and fuel tank replacements.

So,.. a biocide ..... a nonviscous impregnating expoxy ..... entomb it .... let it aerate .......? What's my best strategy to buy some more time?
__________________

__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 06-05-2016, 15:05   #2
Sponsoring Vendor
 
Schooner Chandlery's Avatar

Community Sponsor

Join Date: Jan 2007
Location: home port Washington DC
Boat: SS Crocker design #131
Posts: 977
Wood Base Plate Rot

All our through hull fittings are extra long threads and mounted on over2" thick white oak or purple heart blocks. Our boat is wood as well. Paint can hold moisture under its surface promoting rot by the way. Our blocks are about half and half painted vs natural finish with a sealer.

If your backing block is composite or plywood it may rot quickly without a proper sealant.

You could remove paint and then apply a penetrating sealant that will displace water. Then repaint. Choices of sealants include smiths clear penetrating epoxy sealant 'CPES' as well as the Wolner Woodlife Classic which happens to be water based and water cleanup.

The sorts of things that folks wary of rot place on various parts of wood boats include a wide range of products. You can use a red lead primer or white lead paste mixed into a paint as lead seems to stave off some aspects of rot. Others use mildewcides and additives to paints. Some folks swear by a soak in ethylene glycol (yes antifreeze) and some people will use a coating of bees wax for its water resistance and natural antimicrobal properties. Finally there's a trick of using Stockholm pine tar dissolved in a bit of turpentine (and a touch of Japan dryer to make it cure) to preserve suspect wood.

If you don't have a wood boat you probably shouldn't have wood backing blocks JMO.

If it were my boat I would use what I have handy-short term that is. So if the wood isn't too punky I would want to soak it with many coats of CPES or Woodlife and then paint it with red lead primer or white lead paste mixed into another paint. I have all these materials at hand.

If you don't have any of the materials I mentioned, I dunno, because often using what's readily available is the best fix.

Good luck.


Sent from my iPhone using Cruisers Sailing Forum
__________________
"The only noble thing a man can do with money is to build a schooner." Robert Louis Stevenson

Schooner Chandlery is offline   Reply With Quote
Old 06-05-2016, 15:41   #3
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: Wood Base Plate Rot

I'm not underway or moving about soon. I'm docked in a good size city. I have everything available. I like the penetrating epoxy plan, but I could treat with a biocide or ethylene glycol first.

While were at it,- what about an alternate back up plate,- composite? Should I care?

I was buying light bulbs today and judging between the 9 year bulb and the eleven year bulb for a slightly higher cost. 'not a choice that I'm going to be concerned with!
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 06-05-2016, 18:59   #4
Sponsoring Vendor
 
Schooner Chandlery's Avatar

Community Sponsor

Join Date: Jan 2007
Location: home port Washington DC
Boat: SS Crocker design #131
Posts: 977
Re: Wood Base Plate Rot

You probably won't do any change out until your next haul out. Being a wood boat person, I can't really advise regarding the right backing material for a fiberglass hull. I just don't think wood is it. 😏


Sent from my iPhone using Cruisers Sailing Forum
__________________
"The only noble thing a man can do with money is to build a schooner." Robert Louis Stevenson

Schooner Chandlery is offline   Reply With Quote
Old 07-05-2016, 21:19   #5
Marine Service Provider

Join Date: Sep 2008
Location: Victoria B.C.
Boat: CS27
Posts: 1,725
Re: Wood Base Plate Rot

Quote:
Originally Posted by Schooner Chandlery View Post
You probably won't do any change out until your next haul out. Being a wood boat person, I can't really advise regarding the right backing material for a fiberglass hull. I just don't think wood is it. 😏
G10 is the best choice for a backing material on fiberglass boats. Fiberglass is a good second choice. In both cases epoxied to the hull.

Some links to help:

Seacock & Thru-Hull Primer/Pre Information Photo Gallery by Compass Marine How To at pbase.com

Replacing Thru-Hulls and Seacocks Photo Gallery by Compass Marine How To at pbase.com

Seacock Backing Plates / Alternate Method / No Through Bolts Photo Gallery by Compass Marine How To at pbase.com
__________________
mitiempo is offline   Reply With Quote
Old 07-05-2016, 22:50   #6
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,447
Re: Wood Base Plate Rot

IMO, Hudson, a timber backer well treated with epoxy is quite acceptable in your hull. The epoxy will keep water out, and that keeps rot away. It is not a structure that is exposed to much stress, after all. G-10 or glass laid up with polyester to an appropriate thickness would be good, but not necessary.

Jim
__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Old 07-05-2016, 23:00   #7
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,329
Re: Wood Base Plate Rot

Why are we defending wood? $2 worth of GRP would have been forever. Silly.
__________________
Gear Testing--Engineering--Sailing

Writing full-time since 2014.
Bookstore:http://sail-delmarva.blogspot.com/20...ook-store.html
thinwater is offline   Reply With Quote
Old 08-05-2016, 00:17   #8
Registered User
 
UNCIVILIZED's Avatar

Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
Re: Wood Base Plate Rot

There are various ways to fit new ones without hauling out, if such is off interest. Albeit, generally they're not quite as neat & clean a fit, as if fitted in the standard manner. Nor, necessarily are they meant to be permanent.
Though much of the quality of fit & installation depends upon how you put them in. So if it's truly rotten...
__________________

The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
UNCIVILIZED is offline   Reply With Quote
Old 08-05-2016, 01:02   #9
Registered User

Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 1,373
Images: 7
Re: Wood Base Plate Rot

I use disks cut from 1/2" - 3/4" poly cutting board for a lot of this stuff these days, cheap, easy to find, does not corrode or rot, has a little give which helps both preloading and over tightening?
__________________
RaymondR is offline   Reply With Quote
Old 08-05-2016, 01:47   #10
Registered User
 
UNCIVILIZED's Avatar

Join Date: Jun 2014
Location: Up the mast, looking for clean wind.
Boat: Currently Shopping, & Heavily in LUST!
Posts: 5,629
Re: Wood Base Plate Rot

Quote:
Originally Posted by RaymondR View Post
I use disks cut from 1/2" - 3/4" poly cutting board for a lot of this stuff these days, cheap, easy to find, does not corrode or rot, has a little give which helps both preloading and over tightening?
Hate to have to tell you this, since it sounds as if you already have some of this material installed. But it has very little strength, & doesn't belong in such a critical application.
I've seen it crack, & or split, under any kind of significant loading. Especially point or shock loads. And the properties of this material were covered in depth in a recent thread.
__________________

The Uncommon Thing, The Hard Thing, The Important Thing (in Life): Making Promises to Yourself, And Keeping Them.
UNCIVILIZED is offline   Reply With Quote
Old 08-05-2016, 03:32   #11
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
Re: Wood Base Plate Rot

I will treat this one back up plate with something, likely an epoxy, in order to keep it in satisfactory condition until my next haul out. It's important to note that this one plate was mistreated by me when I entombed it 15 years ago.

The eight other identical wood plates that were installed over twenty years ago are in excellent condition and look like they will remain so beyond my lifetime. I can't fault the wood.

I'll likely be more attentive to the condition of the bronze fittings when selecting replacement than the wood plates; however, any through haul that needs attention will be fully replaced.

Thanks for all the ideas.
__________________
Take care and joy, Aythya crew
Hudson Force is offline   Reply With Quote
Old 08-05-2016, 08:08   #12
Sponsoring Vendor
 
HopCar's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: May 2011
Location: Miami Florida
Boat: Ellis Flybridge 28
Posts: 3,156
Re: Wood Base Plate Rot

Hudson, I think you've got the right plan. Treat it now with penetrating epoxy like Git Rot and keep an eye on it until you can replace it. Groco sells ready made fiberglass backing blocks that are pre drilled to fit their seacocks, their flanged adapters and Apollo seacocks.
Groco Seacock Backing Block
__________________
Hopkins-Carter Marine Supplies & Fishing Tackle
What You Need, at the Price You Want...with Service!
HopCar is offline   Reply With Quote
Reply

Tags
rot

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
re small amount of rot in the base of a timber mast darfaye Construction, Maintenance & Refit 3 01-12-2013 16:38
Coating Wood With Epoxy to Prevent Rot cburger Construction, Maintenance & Refit 49 23-10-2013 14:24
Using Epoxy to Stop Wood Rot JeffHale Construction, Maintenance & Refit 32 22-09-2012 17:01
Need advice - wood rot on my main mast Islandmike Construction, Maintenance & Refit 18 02-06-2008 17:56
Wet Rot? Dry rot? fungus? chad.lawie Construction, Maintenance & Refit 5 07-05-2007 14:52



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:00.


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.