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 Bulkhead plywood type		  New Topic  Topic Locked
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jmadd
1st Mate

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USA
85 Posts
Initially Posted - 08/13/2012 :  07:15:09  Show Profile
I'm going to replace the rear bulkheads - the ones that separate the rear storage areas from the cabin. Is there any technical advantage to using marine plywood over standard exterior plywood in this application? I'm planning to seal all the edges with epoxy and use poly for the finish.

There's one supplier of marine plywood close by but their selection is very limited and I don't want to ship.

Thanks, John
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joearcht
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USA
243 Posts
Response Posted - 08/13/2012 :  18:38:52  Show Profile
I think it depends on how much you value your time and how long you want the replacement to last. Marine grade is a higher grade than exterior plywood in lots of technical ways including strength (which is probably not an issue in this case). Treated the same, I think the marine plywood will last longer than the exterior grade, but either one if well cared for could out live you. I used marine plywood for my repair as I wasn't willing to pay the shipping cost on Teak to match the original and I don't want to worry that job again in my lifetime. Less time maintaining means more time racing :)
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jmadd
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85 Posts
Response Posted - 08/14/2012 :  07:04:35  Show Profile
Yeah I hear you Joe. My understanding is anything I use needs to be finished and sealed so I'm probably going to go with whatever marine grade is available locally. I'm thinking about sealing the edges and 2-3 inches of the bottom where water tends to collect with West Systems epoxy and using spar urethane on the "finish" parts. Does that make sense?

After any rain or race where I dip the rail I end up with water in the compartments so I have to have it sealed. That leakage problem is another thing I'm trying to address.
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joearcht
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243 Posts
Response Posted - 08/14/2012 :  08:20:28  Show Profile
I just sealed my bulkheads with multiple coats of urethane BEFORE I installed them. I keep pretty good tabs on my boat and don't allow water to accumulate anywhere in the hull. You will appreciate the marine grade when you look at the edges after cutting. There should be practically no gaps in the plys whereas with the exterior grade larger gaps will be allowed. This makes edge sealing easier and more durable. If you do hit a small gap in the plys I'd fill them with a wood filler before sealing. Good Luck.
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Ericson33
Admiral

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892 Posts
Response Posted - 08/14/2012 :  08:33:00  Show Profile  Visit Ericson33's Homepage
In my opinion, the rear bulkheads are crap. They do nothing but provide a cut off for the cabin to rear section and allow the hull not to oil can. If i remember correctly its a thin 1/4 inch bulkhead with about 8 screws holding it in place. I would doubt that it was ever marine grade ply. Seal the bottoms of the edge with epoxy, paint to your liking and go sailing.
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jmadd
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USA
85 Posts
Response Posted - 08/21/2012 :  14:04:46  Show Profile
I ended up going with the marine grade mahogany, cost about 96 bucks for a sheet that works for both the two rear bulkheads. The old ones were marine grade, but yeah - certainly not structural. Mine were only just held in by three screws each. You'll get a better fit if you template the actual hull form. My existing bulkheads didn't fit too well and since I used them to template the new ones they aren't an improvement fit wise.
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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.