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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Foam Core Floor Repair. Epoxy?

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valhalla360

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Posted: 05/10/21 01:40pm Link  |  Quote  |  Print  |  Notify Moderator

carringb wrote:

I’ve done epoxy injection on many composite structures, and I world regardless of core. Most 5-min epoxies are compatible with polystyrene, and it makes a good filler when added to resins. I wouldn’t go any shorter than 5-min set because it’ll probably start to set before it’s all injected.


That brings up an important point, you do want some idea of the void size. Epoxy setting is an exothermic process.

In large enough quantities, it gets hot...I've had to throw a mixed cup onto the grass while working on the boat because it was too hot to hold. Usually it just solidified too quickly and I wasted a bit of epoxy.

If there is a large void and you fill it all at once, you get a snowball effect. Because the heat can't escape and epoxy cures faster at higher temps, it generates more heat with even less time for the heat to escape, it cures even faster...in extremes, it can melt the foam or even potentially burn the plywood. See the link...they were measuring temps in excess of 400F.

https://www.epoxyworks.com/index.php/controlling-exotherm/


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bgum

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Posted: 05/10/21 02:14pm Link  |  Quote  |  Print  |  Notify Moderator

Would it be better to use this epoxy AND 1/2 inch marine plywood?

wowens79

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Posted: 05/10/21 09:20pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the thoughts. My first plan was to put 1/2 plywood over the entire floor, but with the price of plywood, thoughts of the slide causing issues with the thickness, I was hoping for another solution.

My youngest started college in the fall, so we are thinking another year or soon this camper to see if we want to keep a bunkhouse, then probably more of a couple camper.


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NCMODELA

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Posted: 05/19/21 05:49am Link  |  Quote  |  Print  |  Notify Moderator

The problem with taking up the foam and replacing it is the aluminum floor joists run in between the foam. So that is not possible. The problem with putting 1/2” on the top is that the floor of the slides will now hit that coming in right?

I have this same problem and been trying to figure out how to fix it without expoxy.

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