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Fiberglassing over pine plywood?

Old 01-12-2019, 03:49 AM
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Default Fiberglassing over pine plywood?

Does fiberglass do ok over pine plywood? Wanting to build a pilot house (dog house) for my boat, really hard to locate fir plywood. My glass guy said pine is fine, (not pressure treated), what do you say?
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Old 01-12-2019, 03:51 AM
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Why not use honeycomb?
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Old 01-12-2019, 05:26 AM
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Pine is way more likely to warp even if glassed. Just look at the sheets that are sitting around unbanded for any time in the sun. Glass will stick to it though.

I would try to get a real grade of plywood like Okume.
If you want less expensive, "Smartside" makes a paneled siding that is very stiff and very resistant to weather. Looks like t-111 on the exposed side and "looks like" OSB on the back. I hate OSB and was very hesitant to use it but after years of testing samples of it I am very happy with it.
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Old 01-12-2019, 06:43 AM
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Check out MDO plywood.It has a resin impregnated coating on both sides and is commonly used in marine applications.It can be painted without the grain showing through.It's what outdoor signs are made from.The big box stores usually stock it in 1/2" and 3/4".A lot easier to use than trying to glass regular plywood.
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Old 01-12-2019, 08:55 PM
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Just make fibreglass panels for the whole thing instead of using crappy wood !!
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Old 01-13-2019, 03:34 AM
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Originally Posted by Sea-r-cy View Post
Does fiberglass do ok over pine plywood? Wanting to build a pilot house (dog house) for my boat, really hard to locate fir plywood. My glass guy said pine is fine, (not pressure treated), what do you say?

if you really have a "glass guy" and he tells you to use wood - you've got yourself an absolute idiot !

you do realize,it's 2019,right ? wood? what are you thinking ?
nidacore,13mm is $59 sheet...are you really that cheap ? friggin hillbillys.....
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Old 01-13-2019, 04:09 AM
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Almost a EXACT repeat of a post some one else had a while back !should TRY AND FIND and use there info !
!
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Old 01-13-2019, 05:59 AM
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Originally Posted by jawz View Post
if you really have a "glass guy" and he tells you to use wood - you've got yourself an absolute idiot !

you do realize,it's 2019,right ? wood? what are you thinking ?
nidacore,13mm is $59 sheet...are you really that cheap ? friggin hillbillys.....
I had almost the same reply typed yesterday but deleted it, figured it wasn't worth the flaming I would get from all those expert "glass guys". Nidacore is a possibility but for a doghouse with windows and all the expossd edges and joints it will take a lot of edge banding. It certainly could be done but the extra work vs. a little more money for a good foam would have me saving a little more money for foam.
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Old 01-13-2019, 09:06 AM
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Nothing wrong with using a marine grade plywood. Just make sure it never sees the light of day.

I’m in the middle of restoring my Bertram and decided on coosa for the core material. It’s a little lighter, only slightly more expensive, and I don’t have to worry as much about water getting into it and rotting it.
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Old 01-14-2019, 04:54 AM
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Originally Posted by jawz View Post
if you really have a "glass guy" and he tells you to use wood - you've got yourself an absolute idiot !

you do realize,it's 2019,right ? wood? what are you thinking ?
nidacore,13mm is $59 sheet...are you really that cheap ? friggin hillbillys.....
Might be so. However, this "idiot" has been building boats longer than a lot of people live. BTY, where do you find nidacore,13mm for $59? Probably not very close to the metropolis of DeFuniak Springs.
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Old 01-14-2019, 04:56 AM
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Id go composite (coosa) or Nidacore especially if you are drilling into it a lot
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Old 01-14-2019, 05:37 AM
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Originally Posted by Sea-r-cy View Post
Might be so. However, this "idiot" has been building boats longer than a lot of people live. BTY, where do you find nidacore,13mm for $59? Probably not very close to the metropolis of DeFuniak Springs.
This is exactly why I hesitated to reply in the first place, being criticized for suggesting an alternative or differing opinion. You might want to have a chat with your boat builder friend about him supplying materials. If he is in "the biz" and honest with you that price for 13mm h8pp wont be so surprising.
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Old 01-14-2019, 05:40 AM
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Originally Posted by bills106 View Post
This is exactly why I hesitated to reply in the first place, being criticized for suggesting an alternative or differing opinion. You might want to have a chat with your boat builder friend about him supplying materials. If he is in "the biz" and honest with you that price for 13mm h8pp wont be so surprising.

This. Even if you use 3/4 coosa your looking at maybe an extra 500 bucks in materials ? to me that seems like pennies in the long run... and Im not a wealthy guy.



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Old 01-14-2019, 07:35 AM
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Default Coosa Board

Originally Posted by Sea-r-cy View Post
Does fiberglass do ok over pine plywood? Wanting to build a pilot house (dog house) for my boat, really hard to locate fir plywood. My glass guy said pine is fine, (not pressure treated), what do you say?
Coosa board is a composite panel comes in 4 by 8 sheets will not rot fiberglass-reinforced is fairly light cots easily. Strongest to fiberglass on both sides. I've use pine plywood before ain't my favorite but I have removed so much plywood in the last 40 years not my favorite
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Old 01-14-2019, 04:28 PM
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Originally Posted by bills106 View Post
I had almost the same reply typed yesterday but deleted it, figured it wasn't worth the flaming I would get from all those expert "glass guys". Nidacore is a possibility but for a doghouse with windows and all the expossd edges and joints it will take a lot of edge banding. It certainly could be done but the extra work vs. a little more money for a good foam would have me saving a little more money for foam.
I used nidacore as an example - that's all...

composites really do not cost that much more than wood.remember,wood requires epoxy,not polyester resins....

no excuse to use wood
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Old 01-14-2019, 04:37 PM
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Originally Posted by Sea-r-cy View Post
Might be so. However, this "idiot" has been building boats longer than a lot of people live. BTY, where do you find nidacore,13mm for $59? Probably not very close to the metropolis of DeFuniak Springs.
if he's been building boats for that long,he should have accounts with suppliers - suppliers deliver

if he's getting fiberglass supplies,he can get a good composite ...

and yep,nidacor is that cheap...$59 13mm

Penske/coosa board is more,right around $200 for 1/2" your "glass guy" should know all this
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Old 01-14-2019, 05:12 PM
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Most pine plwood is not very flat. It's usually intended to be nailed to trusses/joists/framing on 16-24" centers to make it flat.
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Old 01-14-2019, 07:26 PM
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If you do go with the pine ply make sure you use enough fiberglass on both sides to maintain structural rigidity when the core rotted out.


i would go 3/4” coosa. Really like working with that stuff
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