Composite floor options.

[aguerra65]

Hello group.

Working on a complete rebuild of a 1974 22-2 (I have been posting photos) and have already used 1 and 3/4 Coosa board for the transom and am super satisfied with the result, it came out super strong.

As you may know, Coosa is not exactly cheap (I found a great deal at a surplus store for the sheet I used on the transom) and was going to go with marine plywood, not only because of the price but I actually do like the weight which gives it a better ride (my opinion) but after so much work I don't want to be worrying about rot ever again. I have been seeing several options one of them Divinycell which is reasonably priced.

I welcome your input.

Thank you.

[RickK]

Looks like you're making great progress 
https://classicaquasport.com/gallery/showgallery.php?cat=500&ppuser=134616

[mshugg]

Divinycell is a great product, perfect for floors. Airex is another good one.  Honestly coosa is overkill for a deck.  Whatever you can find locally will likely save you a ton of money, since freight on sheet goods is a killer.  Whatever foam you use, hot coat it first before laying glass, because you want the resin to penetrate as deeply into the foam as possible.

[Mwar410]

I did my hatch covers with divinycell, surprised how heavy it was. I actually think it was as heavy as wood if not more. As far as $$$, I’m not sure it’s any cheaper than Coosa around here.

[aguerra65]

Thank you all for your feedback. I think I will go with the divinycell.

Happy sailing!

[dbiscayne]

I've experimented with 5/8" plascore in places I was sure to never need to screw something into it, even considering backing plates I still wouldn't trust it as much as a good foam core.  The plascore w/ a layer of 1708 biax plus a layer of 12 oz biax on each side turned out very stiff. Don't really 'need' the 2 layers on top for strength but I did it anyway to protect it from things being dropped on the deck. In my application the pieces spanned unsupported gaps of about 24 inches and showed no noticeable flex at all. I was using plascore with the veneer and used a coat of epoxy resin first, let it tack up, then glassed as described. Also covered each piece in visqueen and added weights to uniformly compress the pieces while wet, not exactly vacuum bagging but I never had any delamination issues and the pieces came out nice & smooth.

[dakota]

  just a note. my 222 inboard rebuild is receiving a "coosa" type floor. this is the old name for a carbon -fiberglass material. 3 hatches are being put in. 1 in front of console.1 behind console, 1 in stern area. these give access to bilge,engine,&entire boat powertrain,console covers engine(5.8lt) Ford. maintainance for anything from blower hoses to rudder is visible. would have prefered a outboard version of the 222 Asport but this was affordable boat,now hope to enjoy it soon!  dakota

[mshugg]

I did my hatch covers with divinycell, surprised how heavy it was. I actually think it was as heavy as wood if not more. As far as $$$, I’m not sure it’s any cheaper than Coosa around here.

Divinycell comes in different weights.  H80 is the most common at 5 lbs per cubic foot. That works out to roughly 8lbs for a 4x8 sheet of 1/2” material.  I used h130 for the bulkheads on my rebuild.