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post #21 of 29 Old 07-19-2015
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Re: Home made hardtop

Providing the OP does not mind the hijack

Gary is it this 4 ft. x 8 ft. White .090 FRP Wall Board-MFTF12IXA480009600 - The Home Depot

It is described as interior use only. Why do you think this is?

Also it is only 90 thou thick. Do you think that is enough.
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post #22 of 29 Old 07-19-2015
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Re: Home made hardtop

It is if you back it with some matting and roving, then hit it with a chopper gun and thicken it to 1/4 to 3/8-inch thick. It provides a good, solid, nicely finished foundation to get the project underway.

And, if you want, you could use the sheets on both sides and create a very strong sandwich with them.


All the best,

Gary
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post #23 of 29 Old 07-19-2015 Thread Starter
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Re: Home made hardtop

I still like the idea of fiberglass covered foam. Stiff, light, and strong.
Adding pipe is a good idea, but with the shapes I want, fiberglass panels are out.
I want protection from the elements when hunkered down up there. So if the ice ever melts in the arctic again we can do the passage.


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post #24 of 29 Old 07-19-2015
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Re: Home made hardtop

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Originally Posted by travlineasy View Post
It is if you back it with some matting and roving, then hit it with a chopper gun and thicken it to 1/4 to 3/8-inch thick. It provides a good, solid, nicely finished foundation to get the project underway.

And, if you want, you could use the sheets on both sides and create a very strong sandwich with them.


All the best,

Gary

Or as I mentioned you just use the right product in the first place. A large sheet of foam sandwiched fiberglass board. But trying to build anything for a boat out of dry wall is a sure way to end up with an overweight mess of soggy drywall.

If you want to make the board yourself, figure
$20 in fiberglass (50"x5yd 1.4oz).
$70 for 1/4-4x8 divinycell foam core
$50 epoxy - give or take
$50 random consumables.

Add in a few days work and it may be cheaper to build it. Unless you care about your time.

Greg
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post #25 of 29 Old 07-20-2015
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Re: Home made hardtop

I've never worked with foam core and know nothing about it's structural integrity. My current Sunbrella Bimini top measures 7 X 9 feet so a single 4 X 8 sheet wouldn't make it using either material. I really do like the idea of a hard-top Bimini, though, but at this stage of life, I'm finished with the construction aspects of my boat. Just want to cruise and enjoy the boat for the little time I have left above ground.

All the best,

Gary
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post #26 of 29 Old 07-20-2015
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Re: Home made hardtop

3/8 end grain balsa core draped over amock up shape .Glass webbing at the edge of each narrow panel . Z .place next panel into wet webbing and carry on. More rigid and temperature resistant. Solid blocks for thru fasteners. Glass and finish to taste. Flip over and do the under side.
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post #27 of 29 Old 07-20-2015
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Re: Home made hardtop

WOW that looks great. I am inspired to make a dodger for my C&C 30.
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Re: Home made hardtop

Union Pacific,
I am located in the central Florida area if you need technical data or assistance call me at three 8 six 4two three 1seven 11 any time before 11: pm or e-mail n4qij at yahoo n4qij
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post #29 of 29 Old 07-20-2015
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Re: Home made hardtop

Quote:
Originally Posted by UnionPacific View Post
I still like the idea of fiberglass covered foam. Stiff, light, and strong.
Adding pipe is a good idea, but with the shapes I want, fiberglass panels are out.
I want protection from the elements when hunkered down up there. So if the ice ever melts in the arctic again we can do the passage.
What kind of foam are you going to use? Styrofoam and insulation board will not add any strength. Dvinyl cell or others like it are going to be expensive. You might look at the Polypropylene core, I believe Caleb has used it on his Tartan for core on the deck and said it compares to marine grade ply in cost.
Polypropylene core ? 48 x 96 Inches | Express Composites, Inc.
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