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 Plywood Type?		  New Topic  Topic Locked
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dmreece
Deckhand

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USA
11 Posts
Initially Posted - 07/11/2007 :  14:36:06  Show Profile
I have a '78 Standard Rig, dinette. It developed a leak in the companionway. The plywood portal in the Quarter Berth, leading to the hull area, deterioated and needs to be replaced. I can tell this is not standard plywood. Anyone know what type it is and can I special order it at a Home Depot type store? And if not at HD, then where?

Thx,
-dr
David Reece
78 C25 #454 SR/FK "T-Shirt" Arlington, Tx.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 07/11/2007 :  15:50:45  Show Profile  Visit Frank Hopper's Homepage
1/2" teak laminate on one side, most doubt it is Marine grade. I replaced mine with 3/4" A:A ply from Home Depot. I figured A:A would be a better quality with fewer voids. I have not had any problems. The leak that cause a corner of mine to stain was from the brass scuppers, they often need resealing. Water can run along between the cockpit sole and the top of the liner and end up a lot of different places.
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 07/11/2007 :  16:05:36  Show Profile  Visit delliottg's Homepage
[url="http://en.wikipedia.org/wiki/Marine_plywood"]Marine_plywood[/url] may have the designation "[url="http://en.wikipedia.org/wiki/BS_1088"]BS 1088[/url]". BS stands for "British Standard" and determines the types of glues, submersion lengths, delamination resistance, etc. This is all used to determine a Lloyds of London rating. A 4'x 8' panel of 3/4" BS1088 will run you around $100+. You won't find this at HD, and if you ask for it, it's unlikely you'll get much more than an unknowing stare. In the Seattle area there are several stores where you can find it, Crosscut Lumber, Martins lumber in Everett, and a couple others I'm currently drawing a blank on.

Search online for BS1088 or "marine plywood" in your area. If you're unable to find it, I'd had decent luck by saturating good plywood with West System epoxy. Be aware that by itself epoxyied plywood has very little UV protection, so you still need to cover it up with another finish like Cetol to keep it from deteriorating in the sun.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 07/11/2007 :  16:55:21  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by delliottg</i>
<br />...Be aware that by itself epoxyied plywood has very little UV protection, so you still need to cover it up with another finish like Cetol to keep it from deteriorating in the sun.<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
It would appear David's plywood is going where the sun don't shine... (Couldn't resist.) But epoxy is a good idea, especially around the edges after the piece is cut. These days, I'm not sure AA has fewer voids--it's just nicer on both surfaces. The various specialty veneered plywoods aren't much better--just prettier. AC should be fine--A for the berth, C for the "dumpster." Who's gonna notice it isn't teak down there? As for marine grade, that's for exterior exposure, as on plywood hulls and decks. In a leaky, damp place, it'll rot just like anything else--just not delaminate as soon.
Edited by - Dave Bristle on 07/11/2007 16:57:46
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John Bixby
Navigator

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118 Posts
Response Posted - 07/11/2007 :  22:06:02  Show Profile
We recently bought some marine ply in Kemah for a sailing dingy we are rebuilding. I would imagine that
84 Lumber up around the Dallas area would be a good place to start. Also check with Taylor Marine on Lake Grapevine they may know of a source in Arlington. We were able to buy a 1/4 sheet.
john on ms achsa
Galveston Island...because life's to short to live in Dallas
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.