[Public-List] Bulkhead Repair

[Marcelo D. Gentinetta]

Good morning,
I would suggest that you check the core around the slot for the chainplate also. The new portion of bulkhead should be tabbed to the hull on all contact surfaces and even to the underside of the deck. I would use only 3/4 inch marine ply and seal the edge along the chainplate slot with epoxy to prevent future rot. I replaced all my chainplates and forward lower knees last year. In addition, I re-inforced all the other bulkheads. On the SB side the area around the slot for the upper chainplate had significant core rot approximately 6 inches all around which required a recore. All the other slots had just about 1inch of deteriorated core around the slot. On those, I scooped out the core around the slots and filled with epoxy thickened with silica. I replaced the original chainplates with new ones manufactured out of 316 stainless bar stock. I used 1 1/4inch  X 1/4 inch plates and drilled for 3/8 inch bolts. 

Marcelo
Alegría #441

> On Oct 22, 2018, at 4:44 AM, Jonathan Bresler via Public-List <public-list at lists.alberg30.org> wrote:
> 
> John,
> 
> Thank goodness, I have not had to do this.   Have enough other items.
> Fortunately, none structural.
> 
> Suggest considering using a jigsaw and oscillating tool to remove a section
> of the bulkhead by cutting along the underside of the deck, the inside of
> the hull,
> and vertically inboard of the rot.  Use the removed piece as a template for
> a
> replacement piece of either plywood or G10.  Fiberglass that piece back
> into place.
> 
> Pick up the chainplate bolt locations from the piece removed, as well.
> Check chainplate
> bolts to make sure that they are large enough and shoulder bolts, not fully
> threaded.
> Constance has 5/16" shoulder bolts of 316 stainless steel.
> 
> The chainplate backing plates are full length 1-1/4" wide, 3/16" thick 316
> stainless steel
> purchased as bar stock from https://www.onlinemetals.com/ and cut to length
> then
> drilled using a drill press borrowed from another Alberg 30 owner (Thank
> you!) using
> the existing chainplates as a drilling template.
> 
> Couple writeups that helped me when I replaced the bolts in Constance
> 
>   -
>   http://www.threefools.org/velocity/Projects/RebedChainplates/chainplates.html
>   - https://www.cruisingworld.com/how/chainplates-101-inspect-and-refit
> 
> Jonathan
> 
> On Sun, Oct 21, 2018 at 9:15 PM John Irving via Public-List <
> public-list at lists.alberg30.org> wrote:
> 
>> I’ve apparently had a deck leak at the port upper stay chainplate for a
>> while.  The bulkhead forward of the head has rotted next to the hull.  The
>> chainplate support is compromised.  Replacing the entire bulkhead looks
>> like a major project.  Has anyone experience with this problem?
>> 
>> John Irving
>> Scotch Bonnet
>> 
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> 
> 
> -- 
> Jonathan M Bresler
> S/V Constance Alberg 30 #262
> Annapolis/Eastport MD
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