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preventing heel dents in EPS?

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jespin4845
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preventing heel dents in EPS?

Postby jespin4845 » Tue May 12, 2020 2:49 am

so I started building divinycell pocket foil boards, got that down...

made my first surfboard recently, used one layer of 4oz innegra and one of 4 oz s glass

board has been holding up great, really taking a beating, however heel dents are become worse and worse and I suspect it will break soon, what lay up will prevent heel dents? carbon on the deck over the innegra? to stiffen it up I guess?

the wood stringer has prevented the board from completely getting caved in, the heel dents are from jumping, not regular riding so the innegra is working I guess :naughty:

haven't fixed it yet and usually id have a patch by now
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Re: preventing heel dents in EPS?

Postby handy » Tue May 12, 2020 10:31 am

double sandwich is the way to go, put a 3mm hard PVC foam (Divinycell , Airex) on the deck

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jakemoore
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Re: preventing heel dents in EPS?

Postby jakemoore » Tue May 12, 2020 3:10 pm

Does a layer of glass go between the hard foam and EPS?

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Re: preventing heel dents in EPS?

Postby Trent hink » Tue May 12, 2020 4:37 pm

jakemoore wrote:
Tue May 12, 2020 3:10 pm
Does a layer of glass go between the hard foam and EPS?
Yes. But you can use very light glass to keep the weight down. 2.5 ounce is fine.

O.P. might also consider just using a higher density eps foam.

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flying grandpa
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Re: preventing heel dents in EPS?

Postby flying grandpa » Tue May 12, 2020 6:16 pm

Concave deck shape under your foot will do the job, adding bit of better grip.

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Re: preventing heel dents in EPS?

Postby longwhitecloud » Wed May 13, 2020 1:01 am

what density, brand and thickness of pvc did you use to vacuum onto core?

did you wrap all of top and base and rails?


what density of polystyrene?

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Re: preventing heel dents in EPS?

Postby JakeFarley » Wed May 13, 2020 1:40 am

On the few low density EPS boards I've made, I used three layers of 6 oz. surfboard fiberglass on the deck. In between the second and third layer I cut 8" dia. circles of fiberglass cloth and overlap them around 50% in the area where you stand on the board. A bit heavier, but helps prevent heel dents.

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Re: preventing heel dents in EPS?

Postby jespin4845 » Wed May 13, 2020 2:47 am

Thanks for the replies

The eps is a keahana blank that was cnc’ed buy a local Regular surfboard shaper, not sure the density but will ask him to see if anything is available at a higher density

Not sure if I’m gonna route out for the divinycell deck or just lay it on top and sand it down or what....

Or just get a higher density eps and add cloth, the rest of the board has held up great to pounding on the shore break and bar hits and dropping it, innegra is magical, a bitch to work with though

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Re: preventing heel dents in EPS?

Postby longwhitecloud » Wed May 13, 2020 3:42 am

innegra is cool, i seems to "bounce back" more

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Re: preventing heel dents in EPS?

Postby handy » Wed May 13, 2020 10:49 am

jespin4845 wrote:
Wed May 13, 2020 2:47 am
Not sure if I’m gonna route out for the divinycell deck or just lay it on top and sand it down or what....
just route the 3mm out of your blank in the area you want to reinforce it.
I put 3oz 45°/45° carbon under the hard foam and never have problems.


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