Reply
 
Thread Tools Display Modes
 
Old 08-28-2016, 03:19 AM   #1
Member
 
KenM's Avatar
 
City: Stockbridge,Vt - Punta Gorda,Fla.
Country: usa
Vessel Name: Satori
Vessel Model: 1984 34 Mainship
Join Date: Aug 2016
Posts: 15
How to check for deck soft spots

About to drop the hammer on a 1984 Mainship 34. After reading many posts, due have some concern about soft spots in cockpit and deck. I will check on the "smile" of the sliding glass door, but is there anyway to check the rest of the decks for soft spots... i.e if the core is saturated can one tell by "bouncing" up and down on the deck? I don't have a moisture meter. Should the decks have any "give" when testing this way? Otherwise the boat seems sound, been re powered with a cummins 210, has a bow thruster, kohler geny, auto pilot etc.... Like the boat, but am a bit concerned about the deck and flybridge coring.

Thanks in advance...
__________________
Advertisement

KenM is offline   Reply With Quote
Old 08-28-2016, 04:02 AM   #2
Senior Member
 
Simi 60's Avatar
 
City: Queensland
Country: Australia
Vessel Model: Milkraft 60 converted trawler
Join Date: Jul 2016
Posts: 252
Tap with a screwdriver head shows a different sound or if like mine in spots you can see or feel it pump as you walk on it.

Thankfully I have 1 1/2 inch planks as an actual deck with you beut 3/8th F17 structural ply laid over the top which turns to weetbix when it gets wet.
Some on this forum reckon that ply has a place in a boat, I wouldn't use it in packing crates myself.

What are the decks on a mainship 34 made of?
__________________

Simi 60 is offline   Reply With Quote
Old 08-28-2016, 07:08 PM   #3
Senior Member
 
Jeff F's Avatar
 
City: London, ON
Country: Canada
Vessel Model: Mainship 34 MK1
Join Date: Nov 2015
Posts: 132
Most of the 34s have or have had deck coring issues. not unusual in any 30+ year old boat Lots of information on the web and a few folks here that have dealt with it. Pay particular attention around stanchions and the ladder base in the cockpit, and any other deck fittings. A survey is always a good idea.

I bought a 78 with the B210 a year ago and have traveled close to 2000 miles this summer. Very happy with the boat and happy to discuss. The PO had done a lot of work to repair coring and repaint the decks.
Jeff F is offline   Reply With Quote
Old 08-29-2016, 07:30 AM   #4
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 2,439
Quote:
What are the decks on a mainship 34 made of?
Some are balsa core, some plywood, some foam, depends on the year and the area.
The flybridges are balsa core, foredeck balsa or plywood, cockpit and side decks balsa or plywood.
Even if they are wet they are easy to fix if you can do it yourself. If you are paying someone, then it will be pricey.
Let a surveyor tell you if the cores are wet, then price it and act accordingly.
__________________
Jay Leonard
Attitude Adjustment
40 Albin
Mystic,Ct
jleonard is offline   Reply With Quote
Old 08-29-2016, 01:42 PM   #5
Veteran Member
 
City: Cape Coral, Fl
Country: Usa
Vessel Name: Panacea
Vessel Model: Novatec 42 Sundeck Trawler
Join Date: Jul 2016
Posts: 51
Quote:
Originally Posted by Simi 60 View Post
Tap with a screwdriver head shows a different sound or if like mine in spots you can see or feel it pump as you walk on it.

Thankfully I have 1 1/2 inch planks as an actual deck with you beut 3/8th F17 structural ply laid over the top which turns to weetbix when it gets wet.
Some on this forum reckon that ply has a place in a boat, I wouldn't use it in packing crates myself.

What are the decks on a mainship 34 made of?
Ditto on the screwdriver
I use the largest one I have and just let it "bounce" ( large solid plastic handle (no rubber) along as I drop it through my fingers from about 4" you will hear the sound change.
When I bought my current boat, to my horror the surveyor was using a pointed hard plastic mallet to sound the deck, good news no soft spots, bad news cracked the gel coat in several places!

He also used a moisture meter which showed a spot by the windlass (windlass since replaced and leak fixed)
Sounding will only find spots that are already bad, meter will find problems likely to happen soon and leaks can be repaired before damage is done.
Panacea123 is offline   Reply With Quote
Old 08-30-2016, 08:42 AM   #6
Senior Member
 
City: Tampa, FL
Country: USA
Join Date: Nov 2013
Posts: 158
I got myself one of these...
http://tinyurl.com/hwmrypf

Doesn't do any damage, works perfectly, and it is benign enough looking that owners and brokers never get upset like they used to when I pulled out a phenolic hammer.
denverd0n is offline   Reply With Quote
Old 08-30-2016, 04:26 PM   #7
Senior Member
 
Simi 60's Avatar
 
City: Queensland
Country: Australia
Vessel Model: Milkraft 60 converted trawler
Join Date: Jul 2016
Posts: 252
Quote:
Originally Posted by denverd0n View Post
I got myself one of these...
http://tinyurl.com/hwmrypf

Doesn't do any damage, works perfectly, and it is benign enough looking that owners and brokers never get upset like they used to when I pulled out a phenolic hammer.
Its not the brokers boat, I bet the owner would have something to say.

I have seen plenty of damage done on foam boats when clueless surveyors have been let loose with phenolic hammer .
__________________

Simi 60 is offline   Reply With Quote
Reply

Tags
deck core soft spots

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 10:15 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012