Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 27-11-2014, 11:45   #31
Registered User
Pedersen's Avatar

Join Date: Sep 2014
Location: Denmark
Boat: Sip 32, 9.80 meters
Posts: 15
Re: Thru hull backing blocks

Bamboo is not suitable at all in boatbuilding - it rots and splits easily. As already mentioned, you also have to be very carefull with teak and epoxy. Because of the oil content it doesn't glue all that well and has to be prepared first. Plywood is fine of course and much cheaper.

Pedersen is offline   Reply With Quote
Old 28-11-2014, 05:03   #32
Registered User

Join Date: May 2013
Location: Mangareva, French Polynesia
Boat: Heritage West Indies 36
Posts: 525
Re: Thru hull backing blocks

Originally Posted by Cheechako View Post
Thinking out of the box;
Sooooo.... backing blocks started with wooden boats.... if fiberglass hull is 1"= thick or so.. do you really need them?
If you do need them, aren't they supposed to distribute the load wider than the seacock base?
Those Groco ones shown above don't really look much bigger than the seacock base..?
If you want load distribution... looks to me like a triangular seacock base should be avoided and would be better with the traditional round base....
If you use fiberglass blocks, glassed to the hull... what is the point? Concerned about breaking your hull when turning a stuck seacock?
BTW: I was able to see the 31 footer I built in 1981 summer before last. The one seacock I observed (Spartan) that I bedded on epoxied Marine play with 5200 still looked as new visually... hard to say I guess inside....
I'd have thought the hull would be perfectly strong enough on it's own if it is indeed 1" thick, but many modern hulls are not very thick at all. The extra thickness offered by the backing block provides more opportunity for a good seal, as well as strength, and also means that the inside of the boat is now flat rather than curved with the shape of the hull, so the seacock flange sits nicely on it.

DefinitelyMe is offline   Reply With Quote

hull, thru hull

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
TyeTec reef blocks vs. traditional blocks? svfinnishline Deck hardware: Rigging, Sails & Hoisting 1 16-02-2013 18:16
Exhaust: Thru Hull? Not Thru Hull? steel Powered Boats 12 18-10-2012 21:14
Replace depth transducer cored hull - r&r thru with in hull? rpeebles Marine Electronics 5 11-04-2012 11:58
Wood Backing Plate for Thru-Hull Soft and Rotten dubhouse Plumbing Systems and Fixtures 51 27-10-2009 11:18
Garmin 'In-Hull' vs 'Thru-Hull' Transducers La Bras D'or Navigation 24 23-09-2009 07:26

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:56.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.