Deck core ?
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Deck core ?

  1. #1
    Senior Member propless's Avatar
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    Default Deck core ?

    I noticed something strange (to me) last night. I'm working on my 86 Daytona flatbottom. And while washing off the dust I saw a strange looking core material down in the glass. Its in the deck and down the top sides of the hull. What is it, some kind of foam ? Just curious what it is.

    Its got a pattern of small holes in it, and it doesn't feel like its very thick.


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    Senior Member OFFSHORE GINGER's Avatar
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    Propless , to tell you the truth that pretty much looks like Core Mat which actually was designed to control print thru , and from past experience on many boats it was the main cause of delamination , which in my opinion is junk !

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    Senior Member propless's Avatar
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    Well that's not good news.

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    Senior Member Lefty's Avatar
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    I wouldn't be to worried about it being built with core matrial it is not bad if it is installed properly. The deck of my Cole is built with it and it is stronger than any plywood or particle board backed poly/vinyl ester deck. Is there bad spots in it?
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    Senior Member propless's Avatar
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    Quote Originally Posted by Lefty View Post
    I wouldn't be to worried about it being built with core matrial it is not bad if it is installed properly. The deck of my Cole is built with it and it is stronger than any plywood or particle board backed poly/vinyl ester deck. Is there bad spots in it?

    Thanks for the stress relief post. I was actually crawling around under the deck looking, and taping on the outside last night after reading OFFSHORE GINGERs post. Theres no signs or sounds of any issues yet. And yea, the deck is strong/solid for its thickness, it doesn't flex much at all.

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    RPB
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    Just like Offshore said, its for print thru. Looks like core mat to me as well which is a "bulker" or filler material (fluffed glass pad), it adds a little bit of strength as per the rules of thickness in composites. Its not really a true core material if one is looking for measureable structural gains.
    Last edited by RPB; 01-08-2014 at 03:46 PM.
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    Core mat we use to use it to stiffen up larger panels and used it on decks and sides in the 70's It was a pretty common practice in Calif Ski boat market back then. Like said before rules of thickness in composites. Never had any problems as long as it was put down correctly.

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    Senior Member OFFSHORE GINGER's Avatar
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    Over the years i have seen many boats with delamination problems because this material was used from fishing to offshore power boats with one particular brand always comeing to mind - Wellcraft , along with others , and like mentioned by RPB Core mat is a microspher filled Polyester Fabric that is once again used for print thru control along with adding some stiffness ( bulk ) to the laminate . Note : just because this material was used in the past does not always mean there will always be a problem , and with that in mind considering today's technology i personally feel that you will not find many Boat Co's if any......... using Coremat in there build at this time .
    Last edited by OFFSHORE GINGER; 01-09-2014 at 11:52 AM.

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    Senior Member propless's Avatar
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    Thanks again for all the replies guys. At least I know whats in there now. It was just strange looking to me, I hadn't seen anything with that pattern of small holes like that before. I'll probably put it on my list of things to keep an eye on to make sure it doesn't develop issues, but at least I know that it was used successfully in some of the smaller specialty boats like this. Considering the boat is 28 yrs old this year, and still solid, I assume it was used correctly. But I will keep an eye on it in the future.

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