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Old 20-11-2019, 04:04   #1
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Join Date: Nov 2019
Location: Croatia
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Delamination on older Najad or HR

Hi folks

I'm looking forward to buy an older sailing boat from 1980-1990s.
It will be something like an Najad 320-343-390 or a HR 312/352.
From the informations I get on these boats the teak is not only glued on the deck. There are many hundreds if not thousends of screws holding the teak "in place".

By some cheaper boats obviously the complete teak deck needs a removal and a total restoration.

Because the caulking in such a case is not nearly seal, and a lot of water is going under the teak and for sure there is a lot of water going thru the screw holes directly into the deck core.

Based on my google research I can found some boats of the mentioned type, which have already replaced the teak. Some of them made some documentatsions with pictures. But by not one of them I found, I could see that any of them has to "open" the upper deck layer of the laminate to change the rotten foam or rotten wood.

I nearly can't belive that every teak replacement was done at "the right time" before the deck starts do delaminate and sucks a lot of water......

My question is:

What kind of construction Najad or HR used in these construction years?
Is these a "water sealed" cunstruction where the screw holes of the teak deck didn't force the water to getting inside?
Is there no kind of a "sandwich" construction so that water can't get in?

I would like to check in forward what can happen in a worst case scenario with the deck construction under the teak.
It's not a topic if it makes sense to replace the teak with any other material.

Thank you for any advise.

Martin
barfoot is offline   Reply With Quote
Old 23-11-2019, 04:34   #2
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Join Date: Dec 2009
Location: Australia
Boat: building Roberts Mauritius 43ft
Posts: 1,261
Re: Delamination on older Najad or HR

I don't know about the years you refer to but according to the following article both HR and Najad used Divinycell core.

https://www.cruisingworld.com/sailbo...ke-way-swedes/

" Divinycell CY is a closed cell foam with excellent insulation properties, very suitable as insulation in low and cryogenic temperatures. ... As all Divinycell core materials, it has high mechanical properties and low water absorption". (Diab)

Divinycell may absorb a little water but it will never rot

Have you looked at this video clip?




Najad Teak Plug Replacement


Should I change my mind about teak decks on older boats?


If I find anything more I will post it.
coopec43 is offline   Reply With Quote
Old 27-11-2019, 06:00   #3
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Join Date: Nov 2016
Location: South-West Sweden
Boat: Maxi 999
Posts: 43
Re: Delamination on older Najad or HR

This guy over in the UK replaced parts of his deck on a HR 352 due to water ingress:
https://www.youtube.com/channel/UCA-...fYN-8-trk07ORA
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