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Old 03-26-2013
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P31-2 Plywood In Cored Deck?

We cut open the deck under the anchor cleat to investigate high moisture readings and to our surprise found plywood. There was lots of moisture but no delamination.

Two notes.

1. If Pearson added plywood to reinforce the cleat, they did a poor job. Only two of the four anchor bolts are in plywood. The other two are in balsa.

2. In the photo, you can see the border between the end grain balsa and the plywood. While the plywood is wet and rotted, the balsa right next to it seems relatively dry and intact.

It would be nice to know how much deck I will have to cut to remove this piece of plywood. The edge we exposed is very wet and rotted, and we assume because the grain runs horizontally, the entire piece is wet.

Does anyone have information on Pearson construction techniques circa 1987?




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Re: P31-2 Plywood In Cored Deck?

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Originally Posted by Neo* View Post
It would be nice to know how much deck I will have to cut to remove this piece of plywood. The edge we exposed is very wet and rotted, and we assume because the grain runs horizontally, the entire piece is wet.
.... and there's the rub... the problem with plywood coring..

Hopefully someone with knowledge will chime in.. there is a P31 owners' site with some good info, maybe someone there will have what you need.

http://www.pearson31.com/
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Re: P31-2 Plywood In Cored Deck?

I have a 1986 28-2, so made around the same time but one size smaller. I checked the Pearson 28 Forum (found on Yahoo Groups) to see what others have discovered. This was the best description:
"Our 28 has plywood in the coaming tops,
the small raised portion of the side deck where the aft stanchion is, and
under the stern railing. The middle and forward stanchions were balsa core,
and only one was wet."

I know that isn't too helpful, but it does show that Pearson mixed both cores and appeared to use plywood in high load areas.
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Re: P31-2 Plywood In Cored Deck?

Quote:
Originally Posted by Alex W View Post
I have a 1986 28-2, so made around the same time but one size smaller. I checked the Pearson 28 Forum (found on Yahoo Groups) to see what others have discovered. This was the best description:
"Our 28 has plywood in the coaming tops,
the small raised portion of the side deck where the aft stanchion is, and
under the stern railing. The middle and forward stanchions were balsa core,
and only one was wet."

I know that isn't too helpful, but it does show that Pearson mixed both cores and appeared to use plywood in high load areas.
Thanks for the info. I asked around and it seems the consensus is that many builders used plywood in high stress areas. It's been suggested that I replace the plywood with coosa board, as opposed to filling with solid epoxy.
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