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-   -   Chain Plate Bulkhead Repair (http://www.sailnet.com/forums/gear-maintenance/52871-chain-plate-bulkhead-repair.html)

Islander30Bahama 03-27-2009 04:40 PM

Chain Plate Bulkhead Repair
 
Hey everyone,

I posted this on AS as well I figure the more input the better.

So this weekend after I get the motor running I am going to carefully remove a chain plate teak plywood bulk head. I pulled all the trim off in the head side of the bulk and I didn't like the spongyness of the wood. My plan is to pull the bulkhead out and see if I can repair it using penetrating epoxy.
Here is my plan for repairs.

1) Cut and remove fiberglass tabs that hold bulkhead in.

2)once bulk head is out inspect entire bulkhead for dry rot.

3)every three inches or so drill a hole into bulkhead from the edge about 10inches into it.

4) inject penetraing epoxy into each hole.

5) let cure for a few days in the garage.

6) reinstall bulkhead using west system epoxy and glass.

I am open to suggestions if anyone has any input. I figure I should do this project while I have the entire interior torn apart.

Thanks

Jeff

sailingdog 03-27-2009 05:03 PM

Wrote this reply on AS, and posting here as well...

Considering that the wood is spongy, I would do one of the following:

1) re-place the bulkhead, or
2) cut out the spongy area and scarf in a new wood, or
3) cut out the spongy area, scarf in new wood and sister an additional board to it.

Method 1 is probably the nicest looking, but the most work. Method 3 is probably considerably stronger than method 2 and well worth doing. I'd also recommend you do whatever you do on the port side to the starboard side or vice versa.

If the wood is spongy, it has started to rot and probably lost significant portions of its strength. This is a chainplate that holds your mast up.... do you really want to just repair it with penetrating epoxy instead of doing a proper repair.

Quote:

Originally Posted by Islander30Bahama (Post 467475)
Hey everyone,

I posted this on AS as well I figure the more input the better.

So this weekend after I get the motor running I am going to carefully remove a chain plate teak plywood bulk head. I pulled all the trim off in the head side of the bulk and I didn't like the spongyness of the wood. My plan is to pull the bulkhead out and see if I can repair it using penetrating epoxy.
Here is my plan for repairs.

1) Cut and remove fiberglass tabs that hold bulkhead in.

2)once bulk head is out inspect entire bulkhead for dry rot.

3)every three inches or so drill a hole into bulkhead from the edge about 10inches into it.

4) inject penetraing epoxy into each hole.

5) let cure for a few days in the garage.

6) reinstall bulkhead using west system epoxy and glass.

I am open to suggestions if anyone has any input. I figure I should do this project while I have the entire interior torn apart.

Thanks

Jeff


Islander30Bahama 03-27-2009 05:18 PM

Thanks
 
Thanks SD,

I will take some pictures this weekend and post them with the progress of this project so that It may helps others here in the forums.

The only soft/spongy areas of the bulkhead are along where it is tabbed to the hull. If I were to cut that part of the bulkhead off use it as a template to replace with 3/4 in marine plywood then do a sistering board on the forward side of the bulkhead so its in the head and not very visible.

When sistering the two together should I use epoxy and thru bolt it all together for added stiffness?

This is a repair I want to do the right way the first time for in the future I plan to keep this boat a long time and do some coastal sailing with her.

Thanks,

Jeff

sailingdog 03-27-2009 06:40 PM

Quote:

Originally Posted by Islander30Bahama (Post 467499)
Thanks SD,

I will take some pictures this weekend and post them with the progress of this project so that It may helps others here in the forums.

The only soft/spongy areas of the bulkhead are along where it is tabbed to the hull. If I were to cut that part of the bulkhead off use it as a template to replace with 3/4 in marine plywood then do a sistering board on the forward side of the bulkhead so its in the head and not very visible.

The interior layers may be spongy much further along since water can wick a long distance along the plies of the plywood, and being trapped between the outer plies, it wouldn't be immediately visible and could be completely rotten.

Quote:

When sistering the two together should I use epoxy and thru bolt it all together for added stiffness?
Yes, laminating the two pieces together with epoxy and through-bolting is the way to go.

Quote:

This is a repair I want to do the right way the first time for in the future I plan to keep this boat a long time and do some coastal sailing with her.

Thanks,

Jeff
Good to hear, glad to help. :)

Faster 03-27-2009 07:06 PM

If the bulkhead is truly rotting near the tabbing, then it may well separate from the tabbing quite easily. If the original tabbing itself is sound, you might consider leaving a couple of inches of the original tabbing in place, leaving a double ribbed flange into which you can insert the new/repaired bulkhead. The rotten wood can be dug/scraped out of the resulting cavity.

This would give you the ability to be certain that you've put the bulkhead back in the same place, an exisiting, original (presumably well bonded) basis for bolting into after you've retabbed over the entire assembly, with less reliance on a totally secondary bond. You could epoxy the new bulkhead into the old tabbing flange, retab, AND through bolt...

All this assuming the original tabbing is sufficient, and still well bonded to the hull.


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